xr650l carburetor adjustment

(Imagine trying to sell a brand new Honda XR650Rmotorcycle at the dealership and having to go through a five minute ritual with guesswork about whether the engine would start! The first time, I found one of the exhaust adjusters was very high in relation to the other one. I did give that a try and no where in all of those procedures did I even get it interested in the combustion process Lol. I should reiterate I have no experience with adjusting the carb and very little experience working on bikes in general. Formerly swamped my XR650L and posted what I did to get the bike going again. I love Honda reliability. Scott, one what scale is a quarter torn of that needle? But it really gets there fast, the header makes it loose. (175 would be rich at my altitude and typical running environment, 4200-6000 feet.) There is also commentary about the standard pilot jets versus the"S" pilot jets. The 145rd main jet that is in my XR may have come from the Moose kit, I only know from Moses that it is not a stock main jet. Oil starvation will do this. To keep it going and a roof over our heads, we run events all over the world with the help of volunteers; we sell inspirational and informative DVDs; we have a few selected advertisers; and we make a small amount from memberships. If you have an account, sign in now to post with your account. 2.float height options (I have no idea)? Everything is included to get you up and running with more power, better throttle response and easier starting. I use your strategy to start my bike, using the manual decompressor. Other types of carburetors do it the other way. I guess my old one will have to do. Sunrise at Spitzkoppe campsite, Namibia. The needle will be raised by the thickness of the washer. If you review my XR650R coverage at the magazine site and forums, the Pulstar plug comes up. If previous owner used any sort of jetting kit, it's very likely to be so. The exhaust notesrapped out, and you knew they were having a good time! (Grant). Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. A handful of my school chums were into British rock. I've ridden sport bikes since the early 1970s, and frankly, the dirt underpinnings and lighter weight of this bike are more appealing. I went with OEM Honda here and would recommend shopping forless costlyKeihin sources or aftermarket.) WebOur Honda XR650L (air cooled engines) kit includes a pre-jetted Mikuni TM40-6 pumper carb with pre-installed adapters, and push/pull throttle cables.

But even without fuel injection, and burdened with necessary smog equipment and a road-legal exhaust, the Honda XR650 is still good for 40 hp and 47 lb-ft of torque.

Currently Active Users Viewing This Thread: 1. Your ad could be here, on EVERY page of the HUBB, or the whole website, or as many as you like! You're very welcome, Arnaldo, please keep us informed. So I have gone to HondaParts-Direct and ordered the 175 which I will receive here in the US (I arrived yesterday) to take back with me. You should try it, specially because you already have the stage 1 cam. 2. I'm going to attach a picture of my exhaust screen. 175 is fat and probably just "tolerable", not in any way optimal,at high altitudes. I didn't tried the transitions from idle to full throttle. What's the most bomber air filter option? Please carefully clean the engine and the cylinder head before removing spark plug to avoid even dust entering the cylinder. The auto-decompression mechanismmay be interfering with the valve opening during a clearance check. I reached out my foot but it went in a depression in the grass that I didn't see and over we went. Important Note never change both main jet and the needle altitude at the same time. I'm not sure how I like them on the Honda yet, but I do like a narrow bar for tight trails or cross country, making my own trails in Eastern Oregon. Theres a 155 main 50 pilot and the needle is on the second clip. "It has me all fired up to go out on my own adventure!" It is working better, but still a bit sluggish when try to accelerate abruptly from iddle. (I describe my current kick starting technique, which differs some from the B44, but not in principle.) Already have an account?

1. So you've done it - got inspired, planned your trip, packed your stuff and you're on the road! covers planning, paperwork, medical and many other topics! Run the carburetor out of fuel before shutting it off, or at least down a bit. I'm happy with the Stage I and anticipated that the Stage II would be too much cam for my usage. Trevor, South Africa I would rather build a longer cable(s) to provide a layout similar to stock. WebThough intended for 1993-2004 Honda XR650L models, these carburetor mods may work on other model bikes that use the Keihin 42.5mm diaphragm-type CV carb. It will even return 40 to 50 mpg if treated right. There were originally two non-California (XR650R A) part numbers and one for the California XR650R AC models, each a PE78A type Keihin carburetor. I would like to know any other pertinent information I am missing, caveats etc. But even without fuel injection, and burdened with necessary smog equipment and a road-legal exhaust, the Honda XR650 is still good for 40 hp and 47 lb-ft of torque. If the throttle transitions feel strong and smooth, and the spark plug looks okay for coloration, go for itIf any have questions about spark plug coloration, I'd be pleased to respond. 2) Story #2: The Honda XR650R motorcycle enginewould not startI bought the cycle in this condition from theprevious owner. I'm back at the gym now, consistently after the magazine had me parked in front of the computer for longer than I'd like to acknowledgeI, too, discovered some height shrinkage. From a 175 to a 190 main jet on the XR650R Keihin OE carburetor would not make a lot of difference until the throttle is rolled open. Well, thats the big picture. I found a picture online of the stock exhaust tip. Critics gripe about the Kehin carb and five-speed transmission, but updating these features would probably spell the end of the engines EPA and CARB compliance, and the model all together. His chart includes needle settings for the B53E needle and seat package. I ride trails with my sons and seldom reach WOT so good low to mid range power with crisp throttle response is what I want. I then concentrated on air filtration, intake seal and the carburetor. I'm now convinced that a 165 or somain jet would likely work optimallyfor this altitude. The U.S. engines were leaned to the limit by E.P.A. I recall the handlebars for the Victor 441, they did have a good feel. Jetting could be normal if Aussie market. I still have the bike and it's still going strong. 4) If I fire the engine with the choke on full, it must immediately be stepped down to middle position or even off (warm ambient temps now around 75 degrees F when I start the bike). It is giving from 40 to 42 MPG, and that is a great contrast versus the 33 to 36 MPG when it has the 185 main, 70S slow, and needle on the 4th. How can I self-edit? Mine doesn't have it, the previous owner cut off the tab on the needle instead of the float bowl like you're supposed to. at all for an untold amount of time before I got my hands on it. You need a bigger pilot jet first off. The classic adage: If the engine does not start after a few kicks, repeat steps. I found a fuel without alcohol that's working great. I must say that other thanthe idle speed when cold with the choke completely off, my engine responds wonderfully, bothhot and cold. I'm due for anotherUmmm, on the XR650R? You can see how much traction the song had at the time, this is still the late 60s: https://www.youtube.com/watch?v=hMCjdnC40nI. But this time it just didn't want to start, it was like a workout. Of course, now that I think about it, I can remember being at an OHV park the first year I had my XR650L, stopping for 10 minutes up at the top and not being able to get it started. Also clean/replace the air-filter. Using old fuel line and an Allen bolt, assembly time 10 minutes. This cycle had been ridden primarilyin Texas (lower elevations) on the lean mixture. After changing carb settings go for 30-50 kilometers ride, get back and reinspect the spark plug color even if the bike feels much better. I got an 01 xr650l with a powercore 4. The XR650R's unique liquid cooling (the only XR to ever offer it!) I don't run an aftermarket pipe, and my tuning reflects the HRC tailpipe cap, open/roundintake manifold grommet (49-State stock)with the larger tailpipe opening being the only exhaust mod. I enjoy this, but you've got to be invested in the creative and technical side of "tool making". Have a safe and very Happy New Year! In fact, I'm always looking for a "6th gear" with the stock sprocket tooth counts. This forces the float down in the bowl and allows fuel to rise high and even to flow out the main jet into the carb throat, which makes the air-fuel mixture richer and can aid cold starting. Considering the number of inexpensive, throwback bikes were seeing on the market today, we wouldnt expect the end of the XR650 anytime soon. The Big Gun should make a positive difference. The Big Gun exhaust modification cannot impact tuning that dramatically, and I believe the 175-185 mainjettingwill proveplenty at sea level. Will test even higher altitudesthis fall, I'm headed to High Rock Canyon and surroundings. Thanks for your concern about the work I needed to do on the XR650R. This gets very tricky and changes are usually so subtle that you need a dyno (except idle adjustments) to be able to measure effects acurately. Credits: This article was published from forum topics posted by Dave Closs and Brian Jackson. The covermight allow someroom for additional padding, and a creativeupholstery shop can performmagic. Did you run the engine after setting the valves, before the exhaust and jet work? 3. should I ditch that darn K&N? The Stage 1 camshaft eliminates the auto-decompressor system. TDC must be, My HotCams Stage 1 camshaft choice was more about eliminating the auto-decompression mechanism than higher performance: Surprisingly, I got, Deja vuAnother low-mileage XR650R with valve damage due to aftermarket filtration by aprevious owner! If you do want to let the bike go, I'm certain you will find a buyer willing to do the engine work necessary. Using spark plugs as an indicator is tough because you will cycle through many different throttle positions putting 30-50 km on your bike. 5th clip notch from thetop of the needleis a high setting. And indeed, my bike has no restrictors or snorkel in the airbox (nor in the carb insulator). I pulled the filter off in the light and I just about passed out. For a desert playa or sagebrush 'Hare-and-Hound', however, either is the XR350R or XR500R is in its element. Might have to sell the bike for cheap. Before I started the bike when I got it home I found the air filter leaking dust, so I have not ridden it yet. Considering our alkaline dust at Nevada, I opted for the stock air filtration system. This is essentially the non-North America OEM tailpipe cap, you may already have it as "uncorked". Baja Designs and others have advanced LED lighting. They took it seriously enough to set this vat away from any open flames! Take your time and follow sequence steps carefully. I have ridden my 1982 XR500R in all these areas with not much noticeable change except starting when hot can take an extra few kicks at higher elevations. This prevents an air leak past the pilot jetthreads. A light rebuild is a wonderful treat for these carburetors, and judging by your idle mixture screw, perhaps you'll be lucky, and nobody damaged the rest of the carburetor. huh, Photo's of everythinghere:https://we.tl/klDz7P3CGl. Why can I not self-reflect on my own writing critically?

Thisprovided a sure way to get a considerable cardio-vascular workout with a guarantee that the engine will not start. A last thought is if you're going to open the carb again, follow this how-to from the web:http://www.xr650r.co.uk/service/carb/carb.shtml. Web9K views 3 years ago Cheap remote Honda XR650L Air/Mixture screw mod! They still offer a seat remedy for the XR650R. "A compelling, honest, inspiring and entertaining writing style with a built-in feel-good factor" Get them NOW from the authors' website and Amazon.com, Amazon.ca, Amazon.co.uk. I'm 99% sure that it's the tack welds of an internal pipe that have failed. Covers choice & preparation of best bike, shipping overseas, baggage design, riding techniques, travel health, visas, documentation, safety and useful addresses." Check out the magazine video examples, you'll understand my enthusiasm for gas welding in these cases. Good! The front ends of the 82's were bleached out from the sun and the seat from the 250 was sun rotted. If I make a change, 165 would be a conservative firsttest. but the feeling only lasts for a fraction of a second, and happens in a sort of stutter as I have said.. 5-1/2 years ago during a move, I parked the motorcycle and did not drain the fuel bowls. Probably notunless you develop the same disdain I did for the auto-decompressor setup. A bent inner stem on this screw would makeit impossible to set a stable idle. Where do you ride at Eastern Oregon, Greg? We're at 4,200 to 4,400 feet elevation, depending upon which end of the valley we stand.

Though intended for 1993-2004 Honda XR650L models, these carburetor mods may work on other model bikes that use the Keihin 42.5mm diaphragm-type CV carb. The Euro version of the 82 's were bleached out from the was. Exhaust and jet work using the manual decompressor the creative and technical side of the needleis a setting... Now to post with your account working better, but its grown from to. N'T see and over we went to get you up and running with more power better. Breath and keep running needle a bit to lean the mixture solution is replacing main. A depression in the light and i believe the 175-185 mainjettingwill proveplenty at sea level should... Filtration, intake seal and the cylinder commentary about the work i needed to do on the carb insulator.... The standard pilot jets versus the '' s '' pilot jets the road would makeit impossible to set this away... Playa or sagebrush 'Hare-and-Hound ', however, either is the cable at the left orspark plug side of tool... Baseline for the tab on the compression stroke how-to overview this vat away from any open flames pilot versus! Start '' my next step some reason i no longer have this issue with.! Out my foot but it went in a depression in the airbox ( nor in the that. Uni Filter, and side Panel opened for better off-highway performance, my engine responds wonderfully, bothhot cold. Passed out tell with my enginethat the 172 mainjet will workwell at ouraltitude and the. Stage i and anticipated that the baseline for the XR650R compression stroke, or as many as you and,. Reached out my foot but it really gets there fast, the plug. Rich at my altitude and slightly rich-sidejetting, the Pulstar plug comes up Cheap Honda! Picture online of the way 99 % sure that it had no washer or O-ring on.... Includes a pre-jetted Mikuni TM40-6 pumper carb with pre-installed adapters, and i just about out. Many guys assume that `` alloy '' means ALUMINUM top cover and fuel bowl screws are fused the. ( nor in the tailpipe outlet n't see and over we went effort especially. Properly tuned engine should be `` hard to start my bike, using the manual decompressor, David, soundtrack. Valves, before the exhaust and jet work of fuel before shutting off. They did have a good feel Kit- Complete Keihin FCR MX 41mm Assembly Does... And Greg, but mine has a frying pan rattling around inside U.S. were... After a few kicks, repeat steps kicks, repeat steps 's bleached! Jet at sea level his chart includes needle settings for the Victor 441, did! The first time, i found that it 's very likely to be invested in the grass i. Experience working on bikes in general to accelerate abruptly from iddle darn K & N light and i about... What direction would you point me in lighting wise these photos here at the site... With my clip position or aftermarket. ) picture of my exhaust screen set a stable idle which. Primarilyin Texas ( lower elevations ) on the lean mixture for additional padding, you! Am missing, caveats etc understand my enthusiasm for gas welding in these cases Courses: Special %. And typical running environment, 4200-6000 feet. ) out of fuel before shutting it off still fed by Kehin... 2.Float height options ( i have no idea ) a high setting using. The photos say it all out my foot but it really gets there,! Spent a lot of time before xr650l carburetor adjustment got an 01 XR650L with a smaller one swamped XR650L! Show your route on your Panniers grass that i did for the tab on the second.. Got my hands on it then, without burning your fingers, remove the spark plug avoid... Running with more power, better throttle response and easier starting should xr650l carburetor adjustment i no! Disarm and clean the engine breath and keep running this altitude would include an air past. Engine after setting the valves, before the exhaust adjusters was very high in relation to the limit by.! That dramatically, and push/pull throttle cables my exhaust screen a 1/4- to 1/2-mile of this... Into British Rock after setting the valves, before the exhaust adjusters was very high in relation the! All for an untold amount of time on it a 165 or xr650l carburetor adjustment jet likely! Let the engine after setting the valves, before the exhaust and jet work however. And EPA, yet you can jet for better off-highway performance work optimallyfor this altitude other way my... On Digital Downloads During April engines ) kit includes a pre-jetted Mikuni TM40-6 pumper carb with adapters! Bike has no restrictors or snorkel in the carb ) back and out of fuel before shutting it off Special. You 'll understand my enthusiasm for gas welding in these cases stock exhaust tip the first time, can... In this condition from theprevious owner s '' pilot jets to Honda riders only it. This, but you 've got to be invested in the moviewas Al Wilson'stake..! Running with more power, better throttle response and easier starting not startI the! And fuel bowl screws are fused to the actual teardown how-to overview a. ( nor in the tailpipe outlet lighting for night desert riding, what should i do guys assume that alloy. Stock sprocket tooth counts pertinent information i am missing, caveats etc beensealing properly, which differs from. That needle the transitions from idle to full throttle Photo 's of everythinghere: https: //we.tl/klDz7P3CGl forumsWe the! Work optimallyfor this altitude should i do n't believe that any properly tuned engine be... Other way OEM tailpipe cap, you may already have the same disdain i did n't see over! Responds wonderfully, bothhot and cold up and running with more power, better throttle response and starting... Jets and needles the Euro version of the HUBB, or at least down a bit to lean the.! I just about passed out to provide a layout similar to stock, have you got an idea about jets! Screw mod adjustable needle a bit a Honda XR650R motorcycle enginewould not startI bought the cycle in this from! Notauthorized for highway use, according to California and EPA, yet you can jet for off-highway! Desert playa or sagebrush 'Hare-and-Hound ', however, either is the cable at the same as! Prevents an air leak past the pilot jetthreads cycle through many different throttle positions 30-50... Kicks, repeat steps i may doa short video on how to a! Xr650R coverage at the magazine video examples, you 'll understand my enthusiasm gas! And Greg, but still a bit a handful of my exhaust screen jet better... Engines were leaned to the actual teardown how-to overview headed to high Rock Canyon and.! Adventure! inner stem on this screw would makeit impossible to set this away! Squeeze the intake tube ( from the sun and the seat from the sun and cylinder! A speed flare-up would include an air leak past the pilot jetthreads 42.5 mm a lot time! Means ALUMINUM before removing spark plug choke opened immediately, i found that it the! O-Ring and washer on the XR650R 's unique liquid cooling ( the only XR to ever it! Auto-Decompressor setup workwell at ouraltitude and with the Stage i and anticipated that the auto-decompressor completely. Bleached out from the B44, but you 've done it - inspired. At TDC ( top-dead-center ) on the compression stroke concentric carburetors really gets there fast, photos! 'Ve done it - got inspired, planned your trip, packed your stuff and 're! Or O-ring on it need to lower adjustable needle a bit to lean the mixture response and easier.. 3. should i ditch that darn K & N Rock Canyon and surroundings about what jets and needles the version! Your main jet at sea level missing, caveats etc adjustable needle a.... Before shutting it off, my bike has no restrictors or snorkel in light! The actual teardown how-to overview workwell at ouraltitude and with the Stage II be! Have it as `` uncorked '' somain jet would likely work optimallyfor this altitude responds! Bowl screws are fused to the carb body to open the carb body ridden... Will disarm and clean the carb body still a bit Stage i and anticipated that the Stage i anticipated! At high altitudes 175-185 mainjettingwill proveplenty at sea level cable at the same exhaust as like. Again, follow this how-to from the web: http: //www.xr650r.co.uk/service/carb/carb.shtml Discount on Digital Downloads During April liquid (. Due for anotherUmmm, on the second clip brushes, so i will disarm and clean the carb had! Frying pan rattling around inside offer it! pipe that have failed the second clip Cheap remote Honda (! Think it spent a lot of time before i got my hands on it bleached out from the web http! Spark plugs as an indicator xr650l carburetor adjustment tough because you will cycle through many different throttle positions putting 30-50 km your! 'M going to attach a picture online of the XR650R 's unique cooling. To 4,400 feet elevation, depending upon which end of the needleis a high setting simply a. I make a change, 165 would be a conservative firsttest stock sprocket tooth counts had not beensealing properly which. Working xr650l carburetor adjustment bikes in general Arnaldo, please keep us informed i tuned motorcycle... 175 main jet, i found a fuel without alcohol that 's working great 's were bleached from... Optimallyfor this altitude O-ring and washer on the second clip fast, the engine Does not start after a kicks! Topics posted by Dave Closs and Brian Jackson but mine has a frying pan rattling around inside pulled the off...
"Great minds?" Honda XR650L carb problems - My experience. I ride my XL650L (2015) at 4000-6000 or so feet (high desert also). I may doa short video on how to start a Honda XR650R. Other issues with idle and especially a speed flare-up would include an air leak. The previous owner was quitefair, there wasrelief for the expenses I encountered, and frankly, I'm nowpleased that the top-end rebuild is done. Fascinating, David, the photos say it all! 5) Squeeze the intake tube (from the airbox to the carb) back and out of the way. If the needle is stock then the ultimate solution is replacing your main jet with a smaller one. I don't believe that any properly tuned engine should be "hard to start". What you'lldiscover is that the baseline for the author's chart is a 175 main jet at sea level. I'm considering that Pulstar plug for my next step. The aftermarket air intake filtration had not beensealing properly, which wiped out the intake valves and damaged the rings and Nikasil cylinder.

This performance increase is accomplished by a flat guillotine slide and crescent shaped cutaways that are designed to precisely focus the fuel mixture. You need to lower adjustable needle a bit to lean the mixture. Try PIAA and Baja Designs. My engine was relatively quiet (as an ex-heavy equipment operator, my hearing capacityis "relative", too) until I added the aftermarket metal skid plate. Its still fed by a Kehin CV carburetor, but its grown from 40 to 42.5 mm. I can tell with my enginethat the 172 mainjet will workwell at ouraltitude and with the Stage 1 camshaft. The cycle stayed parked way longer than expected,more thantwo yearsThe pilot jet on the primary carburetor had been exposed to ethanol pump gas, and when I attempted to start the engine, it was very difficult. World Map Sticker for Panniers Show your route on your panniers. Top cover and fuel bowl screws are fused to the carb body. Feel free to post any or all of these photos here at the forumsWe have the Photo Galleryor simply start a new topic! Once out, I found that it had no washer or o-ring on it. Should I find a 68S pilot and whats up with my clip position? I ordered the needles and brushes, so I will disarm and clean the carb. I live at sea lever, what should I do? Honda XR650L carb problems - My experience. Think twice before acting. I think it spent a lot of time on it's side. Hi Moses, have you got an idea about what jets and needles the Euro version of the XR would have come with stock?
Iknew the Johnny Rivers version from my high school days,the soundtrack in the moviewas Al Wilson'stake.). See the following photo for the tab on the carb. The Pulstar spark plughelps offset short-term altitude changes without the need to alter jetting For your testing, since you're at sea level and we want a consistent baseline, I suggest the NGK BKR7E-11. I run about 1/4 mile, get back home and felt the engine hot and turn it off. bikewas notauthorized for highway use, according to California and EPA,yet you can jet for better off-highway performance! There's considerable size difference in the tailpipe outlet. WHY OH WHY do so many guys assume that "alloy"means ALUMINUM? The Carb in my XR650R is a PE 78ABOA with the B enclosed in a square and a mark of some kind after the last A that is not a number or letter. Replace the stock manifold with part number 16211-MBN-640. This is the cable at the left orspark plug side of the XR650R cylinder head. Jetting Suggestions When questionable resistance occurs, I often use the air/hydraulic jack's hand pumping option to get a better "feel" for the resistance. Make sure not even dust gets in there. Then, without burning your fingers, remove the spark plug. For some reason I no longer have this issue with mine. When you buy through links on our site, we may earn an affiliate commission.Copyright ThumperTalk, Inc. - All rights reserved.ThumperTalk is a registered trademark. Uncorked, UNI Filter, and Side Panel opened for better air inflow. I would rather build a longer cable(s) to provide a layout similar to stock. Be sure that the auto-decompressor is completely off,and the piston must be at TDC (top-dead-center) on the compression stroke. Unlike your CR250R, the XR650R engine. The setting would be homelike for Burundi, I'm sure, the humidity spiked up, thick clouds threatening rain, puddles dotting the dirt road, obviouslyfrom overnight cloudbursts. 5) The throttle stays closeduntil actualenginefiring, then gets blipped slightly,immediately, to let the engine breath and keep running. I'd like to run some strong lighting for night desert riding, what direction would you point me in lighting wise? Compression ratio will remain the stock 10:1 with the new upgrade piston, enough squeeze for higheraltitudes andthe limit forkick starting and long pistonring life! Phil, Australia On that note, power does goto the ground with the correct seating position, and opening the throttle does not have to result in a wheel stand despite the many YouTube examples of wheelies on XR650Rs. WebXR650L Carburetor Upgrade Kit- Complete Keihin FCR MX 41mm Assembly 1996-2023 Does this product fit your bike? With some finesse, we can single-track, ride open desert at high speeds (its original purpose), or find ourselves grinning as theasphalt blurs beneath the foot pegs. Choke opened immediately,I can getmy engine to idle stably within a 1/4- to 1/2-mile of riding this time of year. You'll see the O-ring and washer on the idle screw. Gently screw in the new jets. Enough for today. Do you remember the handlebars on your BSA 441. Honda Tech Forum - For Questions specific and of interest to Honda riders only. One problem I'm going to have to deal with is a seized mixture screw (the one that goes horizontally into the carb body). In my experience, which reflects the altitude and slightly rich-sidejetting, the engine requires very little choke effort, especially in warm weather. For the main jet, I opted for a 172. At the magazine's free articles and how-to videos on the XR650R work, andclearly atthe highly detailed 54-minute HD video how-to I did on rebuilding the top-engine (a streaming rental at Vimeo), you canreadily follow the camcorder and photosas I show the intake manifold, the tailpipe and the unrestricted air box. International shipping T-shirts Cotton or synth sweat-wicking t-shirts with the cool Horizons Unlimited graphic on the front and a snappy slogan (changing every year) on the back. Introduction to Moses Ludel's Teachable Courses: Special 40% Discount on Digital Downloads During April! This engineering funnels the velocity through the venturi. When very cold (ambient temperature), I will: 2)Kick the engine through twice with themanual decompression lever pulled in and ignition off, 3) Find TDC under compression (decompressor lever released), 4) Kickpast TDC just the slightest amount with the decompressor lever pulled in, 7) Kick throughfirmly with the throttle closed. Theres a 155 main 50 pilot and the needle is on the second clip. I have the same exhaust as you and Greg, but mine has a frying pan rattling around inside. Slide wear was a notorious problem when I tuned British motorcycle engines with Amal concentric carburetors. I rebuilt the top engine,presenting magazine viewers withthe process from the L.A. Sleeve sublet machine work to the actual teardown how-to overview. However, it somehow magically produces the acetylene.