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82 srv 540. Dual carbs. Slow on bottem end. What is a good jetting set up for dual carbs and where should pilot be set. Prc racing pipe as well. Thanks

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 9 Answers

SOURCE: 2005 yamaha yzf 250-unstable idle

I had the same problem, Turns out that my shims were finished, replace the chims and check clearences.

Posted on Mar 12, 2009

  • 1 Answer

SOURCE: 2007 650 yamaha vstar popping through the rear cylinder exhaust

First off did you buy it new? Second has it gone through its break in tune up yet?Did you do the re jeting? My guess is it was re jeted wrong & neeeds to be re jeted again or could also need more air(upgraded air kit) or a tfi or power comand fuel mod.My bike also poped untill I did the air & fuel upgrades & them upgrades will also give you a much needed house power needed for this rig.


Bring it to a shop & have it looked at.......


Good luck

Posted on Apr 26, 2009

  • 190 Answers

SOURCE: Cleaning Carb Jets

not to a trained ear also go by rpm and spark plug color

NOTE: use copper wire to clean jets, sync is just thottles are same position as all carb's just leave them adjustments alone will be fine if are out use a 1/8 drill an place in between piston/butterfly to carb bore to sync/calibrate

better use a manometer for adjusting screws

depends on condition of org parts

worn = richer running

new = lean an clean

also if changed the exhaust system need to
re-calibrate carbs for max performance

Posted on May 09, 2009

  • 3567 Answers

SOURCE: i have a 1984 XR200R with the dual carb set up

You need to remove the top cap off the carb(s) then lift the slide out of the throat of the carb. You will see a long needle in the center of the slide. Lift the needle out then move the clip on the top of the needle down one notch. Two notches may be needed but start with one. Now re-assemble the carb(s). Doing this will richen the low end fuel mix.

Go to the site below where you can see a parts diagram for your specific bike. You will select the actual brand, year, model, etc., once you go to the site. Part numbers and prices are also shown. You can order parts from this site. In the event no price is shown on a particular part, the part is not in stock.
www.babbittsonline.com/pages/parts/viewbybrandand/parts.aspx

Top rating due on this answer for sure! Thanks!

Posted on Jun 06, 2009

  • 3567 Answers

SOURCE: yamaha yz 125 1994

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Can I get a “very helpful” rating on this answer? Thanks!

Posted on Jul 06, 2009

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1 Answer

Only runs with choke on


Hi, Jeff and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Float needle and seat sticking.
5. Float level too low.
6. Carburetor bowl vent line clogged/blocked/pinched.
7. Idle adjusting ***** set too low.
8. Air/fuel mixture ***** set too lean.
9. Idle port, transfer ports, slow air jet clogged.
10. Slow fuel jet clogged.
For more information about your issue and valuable "Free" downloads that you will need please Click on the links below. Good luck and have a nice day.
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Apr 05, 2016 | Red Motorcycles

1 Answer

How do you set the carburettor so it runs correctly ie. pilot jet, and mixture screw?


Hi, David for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry. If necessary, transport your bike to the dealer or shop and have a professional technician take it for a test drive, if it is in running condition, and give you a written estimate of repairs and answer any specific questions you may have about your problem. For more information about your issue and free downloads that you will need please visit the websites below. Good luck and have a nice day.
Pilot Air Fuel Screw Adjustment Explained
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6 CARB SLOW JET ADJUST EASY WAY end


Jan 19, 2016 | Motorcycles

1 Answer

Bike stalls out when gets hot.done oil change ,coil, sparkplug,intake to carb boot, air filter, im outta ideas, cause it goes fine just dies when it heats up,but after it cools fires right up again enough...


i just got a buell 2001 blast had been stored for a while had little bit of bad gas so i cleand the carb out still would die so i askd a tech at harley he said 99% positive that it was the slow jet its a 3.95 part inside the carb take out the old slow jet and replace it with a new 1 cuz u cant clean it out good enough cuz its little pin holes i put new 1 in and it runs like a champ now the guy said no need to rebuild carb just new jet and ull probly be all good my bike would start idle for a min then die and the tech said if that jet is plugd bike wont hold a idle its the jet screw deep inside the carb pull the carb take the bowl off the bottem then ull see the jets hope it helps you out

Aug 18, 2011 | 2001 Buell Blast

1 Answer

I have a 98 yz125, i race it but seem to have a lack in power in certain areas, ive changed my jetting a few times but seem to find the power else where and NOT where i need it, as of rite now im running a...


I would first make sure the power valve is decarboned and moves smoothly. Jetting is trial and error as so many things can affect the mix. Temp. humidity, gas quality, oil ratio etc. Tht being said you can make small changes and keeping a log with results. First write down baseline settings. Include main jet and pilot jet numbers found stamped on the jets and needle number. You don't say where it is you are trying to get power. 125s have poor bottom mid power, it is all on top for racing. Don't change and race or you may keep going when you should stop and melt something. Try to test at the altitude where you will race and read the plug often, cleaning or changing the plug between tests. Be alert for the surging feel of lean mix with racing idle do not let this continue. Remember 0 to 1/4 throttle, pilot and needle base width. 1/4 to 1/2 throttle controlled by needle mid taper. 1/2 to 3/4 throttle needle tip and main. 3/4 to full is the main jet. Find out the stock settings and make sure to start near there. I don't know about a spes pipe but pro circuit has charts for jetting and maybe a support line. I really feel you will get more from a clean powervalve, repack the silencer, clean airfilter and maybe v-force reed. Gearing can offer some options. I just read about a James Dean jet kit for cr250 that puts more power in the low mid. I might try that for my bike. Good luck, just remeber " too lean, too long- too bad"

Apr 06, 2011 | Yamaha YZ 125 Motorcycles

2 Answers

What jet sizes???? GS750.


i put 115 main jets in my 77 ge 750 and it will run but was told to jump up to 140 with pobs and 4into1 pipe (SM6) race pipe at the low side run 130 main and leave the stock pilot in. i rorde mine from NE to SD roude trip about 1300 miles got about 62 MPG with 115 jets jumping up to the 140 will drop the MPG but lets be real im not looking for MPG. hope this will help.

Jan 12, 2010 | 1977 Suzuki GS 750

1 Answer

Have to give it gas to start it,most time it dies back out,do this about 10 times and it will start and run ok


this sounds like a carb problem, inside the carburettor there is a main jet and a pilot jet, the pilot jet controls initial accelaration (pulling away from stopped) it sounds as if this could be getting blocked, its possible to clean yourself but alot of patience and time is needed, along with a little mechanical experience and delicate hands. be sure to choose a good carb cleaner (vinegar works just aswell but do not leave in for more than 12 hours). Whilst disconnecting carb from vehicle be sure to label all pipes and wires so that you know where they belong. Submerge whole carb in your chosen substance (making sure all parts that arent metal, and the main jet and pilot jet, are removed from the carb first) and leave for overnight. Clean the jets out very delicately, use a fine needle to push through the holes being careful not to enlarge them, reattach all components and replace carb into vehicle making sure the correct pipes go in the correct places.

Please rate my help :)

Nov 27, 2009 | 1997 Ford Taurus

1 Answer

I have a 1984 xr200r with dual carb iam wonderin the pilot screw adjustment


the pilot is a jet its not adjustable you can change the size of it,, do you mean the fuel screw?? if so set it at 2 turns out from all the way in

Aug 05, 2009 | Honda XR 250 R Motorcycles

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