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Re: Cub soupup?
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Posted by RN on November 25, 2005 at 00:00:00 from (166.126.218.219):
In Reply to: Re: Cub soupup? posted by R-cubed on November 24, 2005 at 08:52:43:
If you're serious about practical increase in HP- check pistons in now compared to late lowboy- compression was about 1+ point higher than 1st production. Governor springs and weights again to later lowboy series- about 200 rpm higher. Just clean carb, no cutting unless to match mounting faces of manifold to carb, block. Milling of block and head-minimal, only enough to make them flat for mating, 'relieving' block from valve seat area to cylinder for slightly better flow, basicly polish down rough metal and sharp edges, no more- you're not working on a Harley K or WR engine. Polish/match intake/exhaust ports to match manifolds and gaskets for uninterupted flow of gas. You said you had early cub- basicly these parts and rebuilding techniques would bring it up to later middle of series production specs- the 12 hp you wanted. RN
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