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Message: <blockquote data-quote="Dave1234" data-source="post: 134028" data-attributes="member: 23099"><p>One thought on swapping carbs--Bobcat went to a lot of trouble to de-tune this engine--definitely low compression pistons (~7.5:1 vs 9:1), blocked carb secondary when a straight off the shelf 2 bbl version would probably have been cheaper, and the less than optimal vacuum advance.    And the cam--who knows.  The ultimate result was an engine rated at ~ 100 hp (albeit at a higher rpm) now putting out 36.  I suspect somewhere in the hyd system is a pump shaft that is designed for a max of ~ 40 hp, and giving it more will only be likely to break it.  A carb designed to actually serve fuel and air to a ~1600 cc automobile engine @ ~5000 rpm would probably increase the Hp of this engine, possibly to catastrophic levels for the parts it drives.  Be cautious.</p></blockquote><p></p>