Question about Yamaha YZ 250 F Motorcycles

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What are the valve specifications for a 2002 yz250f

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Suppose to be .1 to .15 for intake and .17 to .22

Checking valve clearances:
http://www.thumpertalk.com/forum/showthread.php?t=394312

Adjusting valve clearances:
http://www.thumpertalk.com/forum/showthread.php?t=394342

good luck.

Posted on Mar 26, 2011

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Assuming all other things are working properly(carb and ignition), check the valve clearances. Specifically look for any valve that doesn't have any clearance. This is very common, especially with bikes that have alot of time on them. If so, have the valve(s) adjusted, but keep an eye on any that had closed up. If they close up again in the near future, you'll have to have the valve replaced.

When the valves do this, they are held slightly open all the time and let your compression bleed off, causing it to be near impossible to start. If the bike does start, it will be much easier to start again once it's warmed up. But back to the same when it cools off.


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

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