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Old 12-04-2008, 11:38 PM   #1
Flintrock
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Default overbore G9 specs

OK guys and gals, first time long time....
94 G9, low compression and smoked like a mosquito fogger when I got it. Broke it down, no noticeable cylinder ridge, but not the first time for this engine to be rebuilt. Did a basic rebuild myself that consisted of professional valve job, honed cylinder and re-ringed myself, etc. No smoke but still no compression(<100 WWOT). I know, should have bored it the first time but took a chance, ring gaps were OK. Here's the deal. Small engine guys that know Yamaha GC's around here want the whole cart to do just the engine. I found a reputable, independent MC shop that will bore for $60.00, but asked for the overbore specs. I assumed they would mic the new piston, adjust for ring gap tolerances, and GO. Not a machinist, what am I missing? Help me get a long overdue, dusty project up and running! I know, pics forthcoming!! Thanks!
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Old 12-05-2008, 11:22 AM   #2
smallblock450sl
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Default Re: overbore G9 specs

piston sizes std-73.00mm/2.874in /oversize 1-73.25mm/2.884in /oversize 2-73.50mm/2.894in. piston to cylinder clearance .03to.05mm/.0012-.0020in <limit 0.10mm 0.0039in. ring end gap-0.2-0.4mm /limit 1mm/0.04in. Hope this helps your machinest.
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Old 12-05-2008, 12:45 PM   #3
Flintrock
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Default Re: overbore G9 specs

Dave, thanks a million. I really appreciate it......
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