Question about 2003 Yamaha YZ 250 F

1 Answer

My YZ250F loses all its power after it warms up.

I have a 2002 Yamaha YZ250F and it runs great until it gets warmed up, then i lose all my power, i cant even climb tiny dirt hills.

Posted by on

Ad

1 Answer

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

Check the valve clearances, when the bike warms up the valve clearance will get tighter and a valve will not be closing properly.

Posted on Aug 10, 2009

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Why doesnt 1993 nissan 240sx. stay running right. I think the thermostat didn't open and blew a hose. Now when I start it it runs fine, but gets warmed up and loses power and won't run and dies.Could


proabably thermostat if you changed thermostat and still have problem it could be defective ive heard of a dodge pickup having same problem loses power when heated up it was plugged catalatic converter.

Sep 02, 2014 | 1993 Nissan 240SX

1 Answer

2011 Kawasaki Mule: Loses power when it warms up. even in cold weather. further you push the gas pedal less power it has.


If you have a vent hose coming out of your gas cap make sure it is not kinked. A kink in the hose will cause a vacuum in the gas tank and very slow gas delivery to engine, which would become apparent at higher engine rpms including after warm-up.

Mar 17, 2014 | kawasaki 2011 Mule 610 4x4 XC

1 Answer

Engine wont run after warm up and no choke


Hi, Anonymous 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 screw set too low.
8. Air/fuel mixture screw set too lean.
9. Idle port, transfer ports, slow air jet clogged.
10. Slow fuel jet clogged.
11. Faulty fuel pump.
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.
yz250f will not run without choke on Texas Offroad Network Forums
04 YZ250F Runs but only with Choke pulled WR YZ 250F
YAMAHA YZ250F Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Nov 17, 2013 | 2004 Yamaha YZ 250 F

1 Answer

When I twist the throttle on my Yz250f it falls on its face even when warm? It has a lot of power but you have to coax the rpm's up, once you get the revs up it is great but after it reaches idle


Hi, Larry 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.
Yz250f throttle issues WR YZ 250F
idle to full throttle
YAMAHA YZ250F Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Jan 31, 2012 | 2004 Yamaha YZ 250 F

1 Answer

It starts and runs fine until it warms up. then it begins to "chugg" and lose power.???


If you drive a lot in town, it could be your catalytic converter is getting plugged up.

Jan 14, 2010 | 2002 Jeep Liberty

1 Answer

1997 discovery runs good until the engine warms up


HAVE THE CATALYTIC CONVERTER CHECKED FOR BEING PLUGGED.

Jun 16, 2009 | 1999 Chevrolet Express

1 Answer

1998 chvy 1500 loses power


check the intake gaskets. in the middle front and middle rear. If they are oily, it more than likely sucked part of the gasket in. When it warms up the leak gets bigger. The easy way to check is to get some carb cleaner and spray all around the intake while idling and warm. DO NOT SPRAY ANY EXHAUST PARTS , carb cleaner is combustible. The truck should stumble or even shut off when spraying with the carb cleaner if there is a leak.

May 03, 2009 | 1998 Chevrolet K1500

1 Answer

98 chevy 1500 loses power


sounds like an ECU fault.one of the chips is breaking down when the units warms up

Oct 26, 2008 | 1998 Chevrolet K1500

1 Answer

Saab 2.2tid car loses all power when warm, rev counter goes to zero


Check fuel feed is ok and fuel pump pressure also check cold start injector could be running on this til warm.

Sep 16, 2008 | 1999 Saab 9-5

Not finding what you are looking for?
2003 Yamaha YZ 250 F Logo

Related Topics:

539 people viewed this question

Ask a Question

Usually answered in minutes!

Top Yamaha Experts

dhnguyen

Level 2 Expert

281 Answers

Steve Sweetleaf
Steve Sweetleaf

Level 3 Expert

1144 Answers

Tony

Level 3 Expert

2600 Answers

Are you a Yamaha Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...