Re: Garelli Gran Sport Low Compression Acting Like It's Running Rich

P D /
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It does sound like it's too rich . Have you checked the timing ?

For most motors , 73# is not enough compression to run correctly .

Running a single ring is not your problem , unless that ring is too worn and/or the gap is too great .

I am running a single ring in my FA50 double ring piston . The motor starts easily . Runs smoothly and does it's 'normal' 30 MPH top speed . But , take off is a bit 'less' .

There are plenty of single ring pistons .

Before you buy anything , pull the top end apart and measure what you have .

Piston to cylinder clearance ; ring end gap ( in the cylinder should be as little as .008" and definitely no more than about .014" - .016" ) .

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