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| Gas Yamaha Gas Yamaha Golf Cars; G1 through "The Drive" and U-Max Utility Vehicles |
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03-27-2016, 12:21 AM
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#21 |
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Not Yet Wild
Join Date: Aug 2015
Posts: 38
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Re: G1 new rings = low compression
Yeah, I was gonna tear down and mic everything. I was curious if anyone that has gone this route has had any issue with the machine shop being able to chuck up the cylinder to bore and hone it. From what I see, oversized pistons are available in +0.25mm, 0.5mm, 0.75mm and 1mm. Pistons stamped 010, 020, 030, etc would be oversized in inches. So, 010 would be +0.010" or +0.254mm, 020 would be +0.020" or + 0.508mm and so forth.
Anyone here up on piston to cylinder wall clearances for these engines? Being air cooled, I would assume that it would be fairly tight. Thanks, Nik |
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03-27-2016, 09:59 AM
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#22 |
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Gone Wild
Join Date: Jun 2015
Location: NW Iowa
Posts: 1,669
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Re: G1 new rings = low compression
Specs for G1 Gas Engine:
Std. Bore 68.00mm Piston Clearance 0.03 ~ 0.035 mm Ring End Gap 0.2 ~ 0.4 mm Flywheel Nut 52.6 ft. lbs. Clutch Bolt 43 ft. lbs. Crankcase Bolts 4.7 ft. lbs. Head Bolts (Initial) 14.5 ft. lbs. (Final) 18 ft. lbs |
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03-27-2016, 10:56 PM
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#23 |
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Not Yet Wild
Join Date: Aug 2015
Posts: 38
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Re: G1 new rings = low compression
Right on! Thank you!
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