Question about 2003 Yamaha YZ 250 F

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I Have a 02 YZ 250 that shuts off when i go full throttle. Always in 6th gear on long straights in woods?? could that be a carb prob? idles fine and everything.

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If you hold in 5th does it do, if not sounds like cdi box, my 05 yz450f did same thing

Posted on Feb 05, 2010

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1 Answer

02 yz 250 not reving up


Check the compression. It should have at least 100 psi,..if not,then its time to rebuild the top end..IE piston,rings,bore cylinder. If compression checks out,i would start with the power valve. Two stroke dirtbikes power valves are notorius for gumming up and sticking,causing them to not rev correctly.

Aug 31, 2012 | 2003 Yamaha YZ 250

1 Answer

YZ426 idle probs


Hi, Mike and the usual suspects are:
1. Throttle cables improperly adjusted or pinched.
2. Idle adjusting screw needs to be backed off.
4. Air fuel mixture adjusted too lean start with 2 full turns.
5. Intake system air leak.
6. Fast idle choke ramp is not releasing.
7. Broken throttle return spring.
8. Damaged diaphragm or slide.
9. Faulty MAP, TPS, ATS, O2, sensors or wiring/connector
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.
Other yz426 idle problem
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May 25, 2012 | 2002 Yamaha YZ 426 F

1 Answer

2003 yz 250 starts and idles but runs rich and bogs as soon as the throttle is applied


Hi, Anonymous and the usual suspects are:
1. Throttle cables misaligned or misrouted.
2. Damaged or restricted fuel tank venting system.
3. Intake system air leak.
4. Vacuum piston malfunction.
5. Accelerator pump leaking or no output.
6. Plugged bowl vent or overflow.
7. Fuel level in bowl too low.
8. Restricted fuel supply passages.
9. Plugged jets or passages.
10. Worn or damaged needle or needle jet.
11. The enrichner valve not seated or leaking.
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.
2002 yz250 idles fine but bogs and tries to die when twisting the throttle...
Bike dies when you give it throttle
YAMAHA YZ250 LC Owner Service Manual
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http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Mar 19, 2012 | 2003 Yamaha YZ 250

1 Answer

Yamaha yzf 250 high idle and over heating


Hi, Anonymous and the usual suspects are:
1. Throttle cables improperly adjusted, pinched or need lubrication.
2. Idle adjusting screw needs to be backed off.
4. Air fuel mixture adjusted too lean start with 2 full turns.
5. Intake system air leak.
6. Fast idle choke ramp is not releasing.
7. Broken throttle return spring.
8. Damaged diaphragm or slide.
9. Faulty MAP, TPS, ATS, O2, sensors or wiring/connector
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.
Dirt Rider Magazine
YZ250F Overheating WR YZ 250F
2001 2013 Yamaha YZ 250 Service Manual YZ250 Moto Data Project
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Mar 12, 2012 | Yamaha YZ 250 F Motorcycles

1 Answer

1994 yz 250 stuck on high idle as if bike going to blow up, just got bike running fine, i changed air filter and altered original carb settings do know why tried to put stock plug in because it had b8es...


When you open and close the throttle can you hear the slide hitting the throttle stop?have you removed the slide, and fitted it in the reverse order, this would restrict full opperation of the slide leaving it in the part open position, the cut out side of the slide faces rearmost away from the engine, if you have exsess play in the cable at the carb, it is poss you may have fitted it wrong, unscrew the tickover screw almost all the way until you no longer hear the slide hitting it on throttle closure, start the bike you may have to hold the throttle at the desired revs, whilst doing this screw in the tickover screw until it just increases the tickover, you can now release the twist grip and addjust the idle to suite

Aug 12, 2011 | Yamaha Fuoco 500 Motorcycles

2 Answers

42cc 18 inch craftsman chainsaw model 358-351910-18. Saw runs great at idle or while not cutting wood, when starting to cut wood just after the entire bar gets into the wood engine bogs down and chain...


Generally this is a fuel / air ratio problem. Usually it can be solved by a carb adjustment. On the carb there are usually two screws, one marked low or L , the other marked high or H. Low is your adjustment for idle mixture, high is for mixture at full throttle. The saw should Always be adjusted to run well during the cut. Make adjustments a little at a time, then try The saw. Continue small adjustments untill the saw is performing well at full throttle while Cutting.

Aug 09, 2011 | Poulan Pro Chain Saw 46cc 20"

1 Answer

Hey Guys I have a 2001 Yamaha yz 250 f it idles high and goes to a low idle then dies. I restart it idle it high to warm it up but does the same thing, The pipe gets red then i shut it down.Anyone know...


check for vac leck at the carb. start the bike and take some carb spray and spray around the carb and carb boot. let me know what happens.
Mark
C.C. Motorsports

Mar 14, 2010 | 2003 Yamaha YZ 250 F

1 Answer

Idle seems too low. runs great, when no throttle, stalls. maybe idle too low. no manual, need to know where idle adjustment screw is


If you haven't already adjusted the carb there are usually 3 adjustments. H - adusts performance at full throttle (how it cuts in the wood). L - adjusts performance at idle and accelleration to full throttle.It sounds as though those are fine. The third adjustment T - is the throttle or idle speed (often away from the other 2). If my saw that is the one adjustment I'd make. You supplied no make or model, it is difficult to provide what you requested without them. HTH
Lou

Oct 27, 2009 | Garden

1 Answer

I have a 1991 yamaha yz 250 it starts then shuts off


change the pkug first buy a br8eg plug off ebay and see how this goes get back to me also are you using the choke on start up

Sep 29, 2009 | 2003 Yamaha YZ 250

1 Answer

My 2003 yz250 runs full throttle as soon as it is started. Checked the obvious stuff - carb throttle....it started revving out of control intermitantly now its full time. Any ideas?


3 things... First twist the throttle rapidly and listen for the carb slide to move up and down,, ya should hear a clicking in the carb... if so slide ok.. Sure bout the throttle cable ? At grip ? When starting the bike takes alot of kicks to get started ? As if were flooded ?

Aug 29, 2009 | 2003 Yamaha YZ 250

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