Question about 2003 Yamaha WR 250 F
Hi, Lynnmcneely and the usual suspects are:
1. Fuel mixture too rich or enrichner left out too long.
2. Faulty spark plug.
3. Incorrect spark plug for the engine type or service.
4. Piston rings badly worn or broken.
5. Valve guides are badly worn and/or seals worn, crushed or have come off the valve guide and are pumping oil through it.
6. Spark plug cable weak or leaking check for spark jump in the dark.
7. Faulty ignition coil.
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.
Why Does My Dirt Bike Keep Fouling Spark Plugs
YZ250F fouls plugs
YAMAHA WR250F Owner Service Manual
OEM parts for Yamaha
YAMAHA WR250R Owner Manual
Posted on May 29, 2017
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Posted on Jan 02, 2017
You can do that but getting the correct heat range plug might be trouble. The better soluition is to use a Heli-Coil thread repair kit, this will restore the threads to the factory size. A kit comes with a special tap, several heli-coil inserts and the installation tool. Follow the instructions and you will be fine, one tip that I do not know if it is in the instructions or not, pack the flutes on the tap with heavy grease, this will catch and hold the cuttings keeping them from falling down in the cylinder. Also make sure the piston is at the bottom of the stroke when tapping the hole, this will keep the tap from running in to it.
Posted on Apr 14, 2010
SOURCE: how do i adjust the
If the bike has not been ridden for a while,some of the clutch plates can fuse together.The not starting part has nothing to do with this BUT.To fix the clutch part,the clutch needs to be pulled apart,cleaned and put back together in exactly!!!!!!!! the same order and way it was taken apart.Plates all in order and not flipped around etc..This is a common problem.If you do this a lot of the clutch probs will be gone.Hope this helps
Posted on Dec 03, 2010
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