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Old 01-28-2015, 10:18 AM
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mapbike mapbike is offline
Motorized Bicycle Elite Member
Join Date: Mar 2010
Location: Central Texas
Posts: 5,379
Default Re: Curious about the engine, :question:

Originally Posted by cannonball2 View Post
The Dax rod has no markings. The FM80 is of course a GT5 crank and the high pin piston makes it a GT5 engine(type anyway). Bet the threads are fine. That combo should time pretty well at least better than the half breed.

Did you see my edited post where I theorized that the GT5 adds up to run the 40mm jug, probably with minor timing issues.
Can't remember if I read that post or not CB2, I do know that I talked to Fred through email a while back and he told me that the PK-80 type jug works out good on the GT5 engines as far as timing is concerned, it just needs about .100" shaved off the deck height to get compression and squish where it needs to be.

I have a GT5 engine in the works soon, and I'm gonna do a comparison of the port timing between the GT5 jug and the PK-80 jug on the GT5 lower and see if I can tell any difference other than the deck height.
I dont always ride WOT, but when I do..I do my best to keep the rubber side down..Ride safely my friends!
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