Thread: Top Speed
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Old July 16th, 2017, 06:11 PM   #15
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Name: Roger
Location: Mitchell, South Dakota
Join Date: Apr 2014

Motorcycle(s): 1978 Z1R, 1999 EX250

Posts: A lot.
MOTY - 2018, MOTM - Oct '16
Quote:
Originally Posted by Ram Jet View Post
Thinking about it I guess tighter valve clearances may have the same effect as advancing the cam timing.
More likely it's the extra degree or two of duration that picks the top end up and hurts low and midrange.

And it gets a teeny, tiny bit more lift.
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