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Posted by Bob G on Thursday, November 07, 2013:

In Reply to: Engines 101 posted by Michael Lacey on Thursday, November 07, 2013:

Fuel and air mixture is "sucked into the cylinder". As the piston goes down with the intake valve open it pulls in the mixture, or you create a low pressure area and the atmosphere pressure pushes it in. All the same to me.
When you open the throttle, the air mass thru the venturi increases which pulls more fuel into the mixture, more fuel equals more combustion pressure and the piston is driven down faster.
I would check for loose linkage in the throttle system and adjustment of the governor. there is a cause and effect delay in it tho. You just have to figure out what is normal.
hope this helps.

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