Just rebuilt the top end on my yz426. have checked valve clearance. The intake is in specs while the exhaust is 0.25~0.30 (one valve) and the other valve's clearance is exactly 0.30. According to the manual it must be within 0.20 ~ 0.25 mm It will take a week or two for the shims I’ve ordered to arrive. Can I ride my bike a little with such clearance until I get the shims (I don't want to damage the engine)? BTW, I'm not racing it, just riding around one hour a day usually.