Question about 2003 Yamaha YZ 250 F
I changed the air filter, cleaned the carb and changed the plug. Still wont start. I've been adjusting the idle but have no idea if i'm doing it correctly. Help.
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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Posted on Jun 12, 2010
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Posted on Jan 02, 2017
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