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Gas Yamaha Gas Yamaha Golf Cars; G1 through "The Drive" and U-Max Utility Vehicles |
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06-02-2017, 09:54 PM | #1 |
Not Yet Wild
Join Date: Jun 2013
Posts: 1
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low compression after top end rebuild G1
I Jusy did a top end rebuild on my 1984 Yamaha G1. I put it all together and it will not start . I checked the compression and had only 75 lbs.Was I suppose to use gasket sealer
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06-02-2017, 10:17 PM | #2 |
Gone Wild
Join Date: Jun 2015
Location: NW Iowa
Posts: 1,669
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Re: low compression after top end rebuild G1
Use gasket sealer on the case halves but that wouldn't affect compression
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06-04-2017, 03:12 PM | #3 |
Vegas modded 420
Join Date: Jun 2009
Location: West MI
Posts: 15,433
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Re: low compression after top end rebuild G1
You might have low compression if the rings are dry. You know the old rule you need compression, fuel, and spark to make it happen. Your missing one. Seems like it would still run at 75 but maybe not. Engines can always be picky on a new build fresh start up, had that happen plenty of times and it was nothing serious.
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06-04-2017, 03:43 PM | #4 |
Gone Wild
Join Date: May 2011
Location: Pittsburgh
Posts: 2,941
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Re: low compression after top end rebuild G1
I dont believe you need any sealer in addition to the head gasket. A ring could have snapped during installation as well. Also, did you make sure the ring end gap is good? Should be less than .4mm. Lastly, I make sure that the gaps are each on opposite sides of the cylinder but I dont know think that would cause that big of a compression drop.
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