Thermal expansion

摘要

I recently bought a 2006 Yamaha YZF-R6 with 10,000 miles on it. The engine didn't want to rev out when it was cold but would run perfectly once warmed. I did a leakdown test and saw that every cylinder was leaking through the exhaust valve. I checked the valve clearances and found that all but one of the exhaust valves were "tight," with no clearance at all. So I did a complete valve adjustment and got all the valves within the specified clearances. The bike now runs perfectly hot or cold.