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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
2009 YZ250F Problems
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[QUOTE="Matt90GT, post: 1364787, member: 30871"] 30 days is generous on a race bike. No one else does it. Could you imagine a NASCAR or Indy car with a 30 day warranty?!!! Yeah, it is what it is. But every yamaha I have ever bought comes with a factory service manual. Did you get one? Last 09 that I messed with was not that different from an 07 a friend had. First off the float level is WAY high on them needing adjustment, the leak jet is very hard to dial in - best bet is to spend the $100-150 on a cover with adjustable leak jet from R&D racing, up the pilot to a 45 and then adjust the fuel screw. I would guess your main problem is a plugged up pilot jet. Common with bikes in storage and the crappy fuel around. Also check your intake boot is tight to the head and the carb. Would not hurt to pull it off the head and inspect the seal or Oring there (forget which it is). So clean the carb, adjust the float level, installing a factory R&D AP cover with ALJ, 45 pilot and get an extended fuel screw installed while the carb is out. Then you can dial in the carb externally pretty much once you have the needle in the right clip. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
2009 YZ250F Problems
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