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Old October 19th, 2018, 06:18 AM   #10
Triple Jim
Guy Who Enjoys Riding
 
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Name: Jim
Location: North Carolina
Join Date: Jul 2016

Motorcycle(s): Ninja 250

Posts: A lot.
MOTM - Oct '18, Aug '17, Aug '16
Very little effect, as long as there was some clearance. The trouble is that with only 0.002" clearance, it's not long before that becomes zero, and you start to get some obvious hard-start and long warmup symptoms. On this engine, the clearance grows as it warms up.

Valve seat wear causes the closing of the clearance.
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