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Old 04-08-2009, 12:49 AM
Home-made J's Avatar
Home-made J Home-made J is offline
Motorized Bicycle Member
Join Date: Sep 2008
Location: Santa Cruz, CA
Posts: 32
Default Re: is 40:1 ok after break in?

first of all, in the ratio 40:1, the 40 part refers to the GAS, not the oil, so a 40:1 mix has more oil than a 50:1....I run about 60:1 (less oil) with 91 octane and synthetic buddy has a racer that he runs at 100:1, but this is for short track racing and not for distance. I ran a 50:1 mix for the first 300 miles and my spark plug was blackened, since I thinned out the mixture, it has more throttle response and less incomplete burning....a 30 or 40 to 1 mixture will have oil dripping out your exhaust.
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