Quote:
Originally Posted by BobS
bigscoot,
To my mind, the easiest way to get 50cc from something like the popular Lifan 140cc engine is to delay the intake valve closure, which reduces the displacement.
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Trying to alter an engine for faux Atkinson cycle with a late intake valve only works with fuel injection. Carbs don't like the back and forth air flow. And they are trying to build a diesel out of a gas engine. Which means doubling the stock compression.