Question about Yamaha YZ 250 Motorcycles

1 Answer

Yz250 mixture setting

My yz 250 starts ok but you can not touch the throttle. If I do get it to rev it starts cutting out

Posted by Anonymous on

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Hi, Anonymous for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere $0 you can download another one. 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
YAMAHA YZ250 TWO STROKE JETTING 1999 TO 2014
YAMAHA YZ250 LC Owner Service Manual
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Posted on Jul 22, 2016

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Posted on Jan 02, 2017

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SOURCE: MY YZ250 WONT REV PAST 3/8 THROTTLE. I NEED HELP!!

It does sound like an ignition timing problem, but could also be a breathing issue, air flow in or exhaust flow out could be restricted i.e.:dirty air filter, excessive carbon build up in exhaust pipe from burning too much oil or rich fuel mixture.
possibly and more likely some junk got into your fuel system and partially plugged up the main jet in the carb, -or has the needle on the slide been moved? The little circlip at the top of the needle, if it has one.
1.Replace the spark plug, check gap, check spark, it should be bright blue and fat.
2. check the fuel filter, if no filter check the carb for dirt.



Posted on Jan 20, 2009

SOURCE: 1994 yz 250 bogs down

Have you cleaned the carburator ? It seems the main jet has some kind of obstruction.
Try cleaning the carburator and well a tune up would be fine too after the clean , check the plug/s & air filter too.

Posted on May 10, 2009

ollie reece
  • 1167 Answers

SOURCE: 2005 YZ 250 bike has no power in the powerband motor starts

HI MATE ON THE CARB THERE 2 SCREW ONE FOR IDLE AND ONE FOR MIXTURE THE MIXTURE SCREW WILL BE THE SMALLEST UNSCREW A 1/4 OF TURNS ALSO TRY CHANGING THE PLUG OK

Posted on Aug 25, 2009

ollie reece
  • 1167 Answers

SOURCE: 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

Posted on Sep 29, 2009

  • 73 Answers

SOURCE: my engine races upon starting, as if my throttle

probaby settels down after it warms up a bit :-) pull the carb off and check for a cracked reed valve clasic problem with the old boyseen dual layered valves.
if not check that the carb is well sealed in the neck going into the engine a little air leak will give the engine a runaway effect
ride safe Good Luck

Posted on Oct 09, 2009

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1 Answer

Bike was running great on saturday. Went to the races bike started right up when the gate dropped bike won't rev out all the way. Didn't have this problem yesterday. When we got home i cleaned the car


Hi, Anonymous and the usual suspects are:
1. Severely drained or faulty battery.
2. Faulty regulator/rectifier or high output coil.
3. Faulty power valve, solenoid or installation.
4. Clogged air filter or exhaust.
5. Cracked or incorrect float level.
6. Float needle is not seating.
7. Faulty reed valve.
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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YZ250 bad reed Yamaha 2 Stroke
YAMAHA YZ250 LC Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

May 19, 2014 | 2007 Yamaha yZ 250

1 Answer

YZ 250 mixture screw settings


http://www.pdfmotomanual.com/index.php?r=site/page&view=manuales&order=t&key=Y&make=1752&lang=ENG

Loads of downloadable manuals on the above link....all free. You might find what you are looking for amongst them.

Feb 08, 2014 | 2003 Yamaha YZ 250

1 Answer

2006 yz250 is fine in 1,2, 4 and 5 but over revs in 3rd


Hi, Anonymous and the usual suspects are:
1. Shifter pawl improperly adjusted.
2. Shifter drum improperly adjusted or damaged.
3. Shifter engaging parts/dogs badly worn or rounded.
4. Shifter forks bent.
5. Damaged gears.
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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OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Jan 20, 2014 | 2006 Yamaha yZ 250

1 Answer

My 2000 yz 250 runs but wont rev up it just sputters


Hi, Anonymous and the usual suspects are:
1. Severely drained or faulty battery.
2. Faulty regulator/rectifier or high output coil.
3. Faulty power valve, solenoid or installation.
4. Clogged air filter or exhaust.
5. Cracked or incorrect float level.
6. Float needle is not seating.
7. Faulty reed valve.
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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YAMAHA YZ250 LC Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Aug 06, 2013 | 2003 Yamaha YZ 250

1 Answer

Revs up and down at idle , overheats and bogs down at low revs


Hi, Anonymous and the usual suspects are:
1. Extremely lean fuel mixture.
2. Dirt, rust, water, or ethanol sludge in the fuel system.
3. Sticky throttle cables.
4. Multiple carburetors not in synchronization.
5. TPS sensor out of adjustment or faulty.
6. Wrong spark plugs for the type of service.
7. Throttle bodies not in synchronization (FI)
8. Faulty O2 sensor.
9. Clogged, stuck, or faulty IAC valve.
10. Aftermarket components not compatible with ECM.
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.
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YAMAHA YZ250 LC Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Aug 09, 2012 | Yamaha YZ 250 Motorcycles

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
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2001 2013 Yamaha YZ 250 Service Manual YZ250 Moto Data Project
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http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Mar 12, 2012 | Yamaha YZ 250 F Motorcycles

1 Answer

1986 Yamaha yz 250 won't rev to powerband


Hi, Patrick and the usual suspects are:
1. Severely drained or faulty battery.
2. Faulty regulator/rectifier or high output coil.
3. Faulty power valve, solenoid or installation.
4. Clogged air filter or exhaust.
5. Cracked or incorrect float level.
6. Float needle is not seating.
7. Faulty reed valve.
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.
1999 yz250 not hitting power band
2001 YZ 250 Won Hit Powerband Yamaha 2 Stroke
YAMAHA YZ250 LC Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Oct 13, 2011 | 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

1 Answer

2005 YZ 250 bike has no power in the powerband motor starts


HI MATE ON THE CARB THERE 2 SCREW ONE FOR IDLE AND ONE FOR MIXTURE THE MIXTURE SCREW WILL BE THE SMALLEST UNSCREW A 1/4 OF TURNS ALSO TRY CHANGING THE PLUG OK

Aug 25, 2009 | Yamaha YZ 250 Motorcycles

1 Answer

MY YZ250 WONT REV PAST 3/8 THROTTLE. I NEED HELP!!


It does sound like an ignition timing problem, but could also be a breathing issue, air flow in or exhaust flow out could be restricted i.e.:dirty air filter, excessive carbon build up in exhaust pipe from burning too much oil or rich fuel mixture.
possibly and more likely some junk got into your fuel system and partially plugged up the main jet in the carb, -or has the needle on the slide been moved? The little circlip at the top of the needle, if it has one.
1.Replace the spark plug, check gap, check spark, it should be bright blue and fat.
2. check the fuel filter, if no filter check the carb for dirt.



Jan 19, 2009 | 2004 Yamaha YZ 250 F

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