Author Topic: 4 stroke string trimmers  (Read 219 times)

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Offline 660magnum

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Re: 4 stroke string trimmers
« on: July 24, 2015, 07:18:22 am »
The ones that source the impulse from within the intake manifold have vacuum only for a impulse and there is a return spring on the impulse side of the pump diaphragm. (Like the Ryobi)

The ones without the return spring on the pump diaphragm have the impulse sourced from the crankcase.
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