I have an 05 yz450f that I bought 2 months ago and can't ride. It was running when I bought it but wouldn't idle so I thought no big deal I can fix that. Well after replacing almost every seal in the thing, air filter, spark plug, pilot jet, oil filter and giving the carb a good thorough cleaning, drained old gas and put fresh 93 octane in it the bike still won't start with out throttle. I checked valve clerances and timing and this is what I found. The left and right intake are at .009mm the center intake is so tight I can't fit .004mm (smallest feeler I have) right exhaust is at .023mm left exhaust is .025mm. Why is the middle intake so much tighter? Also the I on the flywheel is off to the left if both dots on the cams are lined up. Could that be why it's off? I'm really getting tired of messing with this thing.