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Gas Yamaha Gas Yamaha Golf Cars; G1 through "The Drive" and U-Max Utility Vehicles |
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03-28-2018, 12:32 PM | #1 |
Not Yet Wild
Join Date: Mar 2018
Posts: 7
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Low compression
I have 60 psi on cylinder and I think it should be 90 or above. G1 1982 model. Can a reed valve cause this? Head has been rebuilt, new piston and rings.
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03-28-2018, 01:52 PM | #2 |
Gone Wild
Join Date: Jun 2015
Location: NW Iowa
Posts: 1,669
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Re: Low compression
No Reed's have nothing to do with compression if it's a fresh top end I try another gauge was the Piston installed right opening in Piston skirt towards carb?
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03-29-2018, 07:21 AM | #3 |
Not Yet Wild
Join Date: Mar 2018
Posts: 7
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Re: Low compression
Yes, piston was correct. Does head gasket require any adhesive or go on dry ?
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03-29-2018, 07:58 AM | #4 |
Gone Wild
Join Date: Jun 2015
Location: NW Iowa
Posts: 1,669
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Re: Low compression
Dry... Did you measure ring gap? Did you torque head to 18 ft lbs
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03-29-2018, 08:45 AM | #5 |
Not Yet Wild
Join Date: Mar 2018
Posts: 7
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Re: Low compression
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03-29-2018, 09:32 AM | #6 |
Gone Wild
Join Date: Jun 2015
Location: NW Iowa
Posts: 1,669
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Re: 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 .1 is a lot spec in inches is .007-.015 if you have it part I'd check Piston clearance also if he used the cheap Chinese rebuild kit they aren't always within spec |
03-29-2018, 11:32 AM | #7 |
Gone Wild
Join Date: May 2011
Location: Pittsburgh
Posts: 2,949
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Re: Low compression
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03-29-2018, 11:53 AM | #8 |
Gone Wild
Join Date: Jun 2015
Location: NW Iowa
Posts: 1,669
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Re: Low compression
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03-30-2018, 11:34 AM | #9 |
Not Yet Wild
Join Date: Mar 2018
Posts: 7
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Re: Low compression
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03-30-2018, 05:28 PM | #10 |
Gone Wild
Join Date: May 2011
Location: Pittsburgh
Posts: 2,949
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Re: Low compression
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