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Gwiz

12-12-2007 14:57:13




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You are suggesting the piston creates a vacuum in the crankcase on the upstroke thereby drawing gas through the carb and into the crankcase? Then as the piston comes down, the crankcase air is compressed forcing it into the chamber? This also requires a check valve to stop fuel from exiting the carb? Does the combustion chamber also have a vacuum at the bottom of the stroke like a four stroke? Seems like the crankcase would be a very large volume for the small piston to effect the pressure much? James

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onefarmer

12-12-2007 20:03:54




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 Re: Come again in reply to Gwiz, 12-12-2007 14:57:13  
Some times there is a check(reed) valve in the intake. Many, maybe even, most just cover/uncover the intake port in the bottom of the cylinder with the piston. The piston acts as the check valve.



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