Question about 2003 Yamaha YZ 250

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Pilot jet head snapped in carb on a 2002 yamaha yz 250

I was cleaning the carburetor on my 2002 YAMAHA YZ250 and I tried to unscrew the pilot jet when the screw head snapped off leaving it inside the carb, with no head on and therefor no way to unscrew it! Ouch!!! Is there any way I can get it out as the rest of the carburetor is in brilliant condition.

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  • ANDREW JAMES NEWTON Feb 15, 2012

    hiya guys, i didnt actually remove the pilot jet, the head sheared off before i could get it out, was thinking about using a broken screw exctractor but dont know if this would work with it being brass, just need to get it out to replace it.

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  • Yamaha Master
  • 43,737 Answers

Hi, Andrew 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.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Damage Pilot Jet Extraction on Mikuni Carbs MOV
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Yamaha YZ250 Owner Service Manual
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Yamaha yz250 2015 Owner Manual

Posted on May 04, 2017

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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

ckoira57
  • 267 Answers

SOURCE: need spects for carburetor main jet

http://www.cmsnl.com/yamaha-yz125r-2003_model11245/partslist/A-12.html

Site above has all the parts and specs for your bike. Jet ranges are large for a YZ as many mod's are available and riding conditions contribute largely to a peaky 2 banger. Start with #40 pilot, and #420 main. Trial and error from there. Cheers.

Posted on Apr 27, 2010

  • 58 Answers

SOURCE: 2001 raptor 660r with k&n

will need to fit larger pilot and main jet
size will depend where you are as colder climate will need to be richer than warm climate, normally 1 size up from std on pilot and 2 on main

Posted on Sep 02, 2010

  • 2427 Answers

SOURCE: 04 yz250...goes straight to full

did you put the jet in correctly ?? are you sure it aint upside down ?

Posted on Apr 02, 2011

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What should the jetting be for a 1994 yamaha yz 250 at 5000' elevation


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Jetting on 1994 yz 250. the main jet is a 330 the pilot is a 40 and the needle is a 61. we mix the oil to 50:1 but it loads up onan idle and in the middle. we are at 5000' elevation.


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1. Closed to 1/8 throttle is managed by the air screw and pilot/slow jet.
2. 1/8 to 1/4 throttle is managed by the air-screw, pilot/slow jet, and throttle slide.
3. 1/4 to 1/2 throttle is managed by the throttle slide and jet needle.
4. 1/2 to 3/4 throttle is managed by the jet needle, needle jet, main jet, and air jet.
5. 3/4 to wide open throttle is managed by the main jet and air jet.
6. Wide open throttle is managed by the main jet.
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 and valuable "FREE" downloads that you will need please click on the websites below. Good luck and have nice a day.
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7. Float bowl vent or overflow tube clogged.
8. Fuel flow to carburetor restricted.
9. Intake manifold leak.
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Excessive stalling at low speeds on 2005 yamaha yz250 f


Hi, Jonathan and the usual suspects are:
1. Idle circuit and transfer ports clogged.
2. Air fuel mixture adjustment too lean.
3. Pilot jet clogged.
4. Faulty accelerator pump.
5. Float level too low.
6. Float bowl contaminated old fuel, water, dirt, rust, etc.
7. Float bowl vent or overflow tube clogged.
8. Fuel flow to carburetor restricted.
9. Intake manifold leak.
10. The gas cap is not venting properly or fuel tank venting system blocked.
11. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
12. Needle and seat stuck closed in the float bowl.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
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1 Answer

What should the stock carb jets be for a 94 yz250 with the stock pipe and aftermarket silencer


Stock Jetting for a 1994YZ250 is:

350 main
45 pilot
J8-6EJ33-61 needle

Adjust your jetting down one size for each 1000' of elevation above sea level. Needle clip position on the needle fine tunes the pilot circuit.

Scott

Dec 12, 2009 | 2003 Yamaha YZ 250

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