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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
just got a YZ 250. it wont crank
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[QUOTE="FNG, post: 1339246, member: 89198"] The needle/seat could be worn out which could have caused a lot of fuel to pour in to the motor/pipe. If the pipe is full of fuel it will run on the bottom but cause troubles as the RPM's rise. I had a similiar problem on my 95' when I rebuilt the top end last fall. I put 1 piece in the governor linkage on backwards and it caused the powervalve to not open. [url]http://www.yamaha-motor.com/sport/parts/home.aspx[/url] It is the part right above the #7. It has to be installed in the direction shown. It will "fit" both ways but will not work. Make sure the pilot is clean as this will cause the bike to start hard and also not idle. As for reeds, I just picked up a RAD valve so I have a set of Boyesen Superstock reeds with 3 rides on them. When I replaced them I found a rip in my intake boot. I tried to seal it using some stuff my buddy uses in the aircraft industry but it could not hold up to the vibration. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
just got a YZ 250. it wont crank
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