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Engine basics => Four strokes only => Topic started by: wwwarbird on January 05, 2011, 05:53:14 PM

Title: Left hand crankshaft?
Post by: wwwarbird on January 05, 2011, 05:53:14 PM

 Does anyone know if there is a left hand crankshaft available for the current version of the O.S..30?

Title: Re: Left hand crankshaft?
Post by: bill bischoff on January 05, 2011, 08:29:30 PM

The crankshaft does not determine the direction of rotation on a 4 stroke, the cam does. Once upon a time OS made a reverse cam for the FS 20, but there is not one made for the 30 that I know of. Saito has a reverse cam that fits the 50/56, but that's the smallest I know of at this time.

Title: Re: Left hand crankshaft?
Post by: Joe Yau on January 06, 2011, 09:54:06 AM

Quote from: bill bischoff on January 05, 2011, 08:29:30 PM

Saito has a reverse cam that fits the 50/56, but that's the smallest I know of at this time.

I thought Saito only made one for the .62.  ???

Title: Re: Left hand crankshaft?
Post by: bill bischoff on January 06, 2011, 10:50:30 AM

It is my understanding (not based on actually doing it) that the REAR cam for the 100Ti inline twin is essentially a 50/56 reverse cam. I could be wrong, but this is what I have been told.

Title: Re: Left hand crankshaft?
Post by: clark macomber on January 09, 2011, 09:33:47 AM

O.S. made a left-hand cam for the FS40 as well.  I know because I have one NIP bought for a forgotten project.  The FS40 wouldn't be too much different than the 30.

Clark M.