Question about 1988 Yamaha FZR 250

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Tune FZR 250

1991 FZR250 compression test pressure. carburettor main jet size standard, pilot jet size stanard. this will give a point to start.

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  • Anonymous Mar 13, 2014

    What size jets and power jets to use


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Should run then we had a fzr 600r and did work to it so i know from experience..

Posted on Dec 05, 2008

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Xl250 r 1987 where is the pilot jet located

Remove carburettor bowl and the pilot jet is just forward of the main jet and emulsion tube. If pilot jet is blocked either carb clean or strand of electrical wire will clear it then blow out with compressed air. Fuel mixture screw is just forward of float bowl. Start at 1& half turns out from seated.

Nov 29, 2013 | Motorcycles

1 Answer

Fuel line routing



Fine tune your motorcycle before rejetting your carburetor. If it's still running too lean, you can replace the pilot jet as a first step

Remove the bowl at the base of the carburetor by unscrewing the screws holding it in place. Unscrew the pilot jet inside, but be careful not to strip it. The jet size will be on top.

5 Year/ unlimited mile warranty No up front core charge

Use a screwdriver to remove the main jet from the brass jet needle holder, which is also called the emulsion tube.

Put in a pilot jet that is one size larger. Replacing it with a jet two sizes larger will make your mixture too rich.

Tune the slow/idle settings before replacing the main jet. Replace the main jet with one size larger. The sizes are in increments of 5.

Put the bowl back on, and align the accelerator pump shaft and rubber boot.

Reinstall the carburetor on the motorcycle and retune it to finish the rejet procedure.

Jan 11, 2013 | 1998 Honda VT 600 C Shadow

1 Answer


change main jet in the carburettor install K&N air filter and iridium NGK or DENSO spark plugs tune up your engine change oil filter and oil. Flush your radiator check tyres pressure, Check engine compression and air leaks from inlet manifold ,Run hi octane fuel and injection cleaner mix for 250k to clean the carbon in the cylinders ,check for fuel hose loose ,carburettor leaks,distributor cup aluminium contacts to be clean, Vacuum hose on distributor unit for suction for advance timing .

Sep 20, 2012 | Mazda 323 Cars & Trucks

1 Answer

How do i drain old feul from the carburettor of a hyosung gt 250 comet???

Hi, you could remove the drain screw from the bottom of the float chamber, this is the lowest
Point on the carburettor, however if u are having running problems, the best thing to do would be to remove the carb-s
Remove and clean out the float chamber including the main jet pilot jet, and choke tube,

Jul 29, 2011 | 2003 Hyosung Comet 250

1 Answer

What size main jet for 94 foxeye model also standard air screw setting cheers john

Hi, John1810 sorry you can't find the first and best tool you ever bought for your Yamaha despair, not for a mere $10 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the websites below. Good luck and have a nice day.
My 1989 Stock Carb settings tuned to perfection The FZR Forum
step by step fzr600 carburetor rebuild
OEM parts for Yamaha

Apr 20, 2011 | 1994 Yamaha FZR 600

1 Answer

1994 yamaha fzr 600. the bike starts fine and runs ok but while riding the bike doesnt take full throttle just bogges out and wont pick up speed

Hi, Jay32769 tuning your carburetor is fairly simple once you understand the basic principals. You engine is a simple airbox sucking air in and blowing it out, it is finely tuned at the factory for maximum performance once you upset that delicate balance by changing air filters, camshafts or exhaust systems your performance may go down the and the engine may run poorly, you need to compensate the air-fuel mixture in the carburetor in order for the engine to run smoothly and at peak performance. If you are running multi carburetors you need to sync them first and make sure your air cleaner element is clean and dry. Here is how and where you compensate trouble:
1. Your air/fuel mixture ***** manages your idle.
2.. Your slow speed jet manages 0-1/4 throttle opening.
3. Your jet needle c-clip position manages 1/4-3/4 throttle opening.
4. Your main jet manages 3/4-wide open throttle.
If you are running lean, spark plug electrode color is white, engine runs hot and feels like it is starving for fuel you need to go up on the jet size or move the c-clip down one notch. If you are running rich, spark plug color is black or dark gray, engine runs cool, and bogs down when accelerating you need to go down on jet size or move the c-clip up one notch. When your carburetor is properly tuned for maximum performance your spark plug electrode will be a light tan color like coffee with cream. If you prefer fuel economy over performance you can go down on main jet sizes until a satisfactory level of lower performance is acceptable versus MPH, your spark plug color will be whiter and your engine will run warmer. These tuning adjustments will only make improvements if your intake and exhaust system have no air leaks or sealing issues and the entire electrical system is in proper working order and you have no mechanical issues. For more information about your issue, please click on the websites below. Good luck and have nice a day.
How to Diagnose Motorcycle Carburetor Problems
yamaha FZR 600 carburator doing much better
OEM parts for Yamaha

Apr 10, 2011 | 1994 Yamaha FZR 600

1 Answer


these symptoms usually point toward lean on fuel for some reason
most common would be dirty or gummed pilot circuit and pilot jet I would remove carb and take out the pilot jet clean or replace with new - blow compressed air through the hole the pilot jet came out before reinstall
depending what altitude you are a bigger size pilot jet may assist this issue also but clean and replace original pilot jet and circuit first to confirm

Jan 02, 2011 | 2003 Yamaha WR 250 F

2 Answers


Hi and welcome to FixYa,

On a 2003 Kawasaki KLX125, these are standards:
  • main jet - 145
  • pilot jet - 17.5

Good luck and thank you for asking FixYa. Happy Holidays.

Dec 18, 2009 | 2003 kawasaki KLX 125

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.

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Nov 27, 2009 | 1997 Ford Taurus

2 Answers

Petrol smell

looks like your carburettor's giving out a rich fuel mix there or you've forgotten to turn off the choke get you carb tuned or jetted for better mileage (at a loss for speed - acceleration & power... if that's not important to you).,,

Nov 10, 2008 | 2006 Hero Honda Glamour

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