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| Gas EZGO Gas EZGO Marathon, Medalist, TXT and RXV. |
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03-08-2020, 05:03 PM
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#1 |
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Not Yet Wild
Join Date: Jan 2020
Location: Idaho
Posts: 10
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2pg Low compression after rebuild
I have a 1980 EZGO Marathon, I have rebuild the engine new crank seals, bearings, new cylinder and piston and rings on my second set of rings and still low compression about 70 it does increase when i put oil in the cylinder to almost 100 so I guess its leaking past the rings, what am I doing wrong. There is a R on the rings and I have that facing up. I also checked the reed valves they seem to be good. It starts and runs good just no power. Thanks for the help.
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03-08-2020, 06:33 PM
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#2 |
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Not Yet Wild
Join Date: Aug 2019
Location: VA
Posts: 51
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Re: 2pg Low compression after rebuild
Did you hone the cylinders before you put the new rings back in?
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03-08-2020, 07:50 PM
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#3 |
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Test before replacing
Join Date: Aug 2013
Location: Ohio side of the Pennsylvania border.
Posts: 3,495
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Re: 2pg Low compression after rebuild
What was the ring end gap?
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03-08-2020, 10:19 PM
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#4 |
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Not Yet Wild
Join Date: Jan 2020
Location: Idaho
Posts: 10
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Re: 2pg Low compression after rebuild
I did hone the cylinder but didn't check ring end gap, could it be that?
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03-08-2020, 11:41 PM
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#5 |
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Test before replacing
Join Date: Aug 2013
Location: Ohio side of the Pennsylvania border.
Posts: 3,495
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Re: 2pg Low compression after rebuild
Just covering all the bases. While unlikely, it's possible that they sent the wrong piston and cylinder combination. Did you for sure install the piston the right way?
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03-09-2020, 08:09 AM
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#6 |
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Not Yet Wild
Join Date: Mar 2020
Location: Alabama
Posts: 16
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Re: 2pg Low compression after rebuild
Did you stagger the piston rings? If the ring gaps line up it will drop the compression.
Check the gap, could have the wrong set of rings. Cylinder wear, could be out of round. A little rare on such a low compression/hp motor. If its been built and honed out before they can get a little sloppy. What about the heads, Gasket or valves could be the problem... |
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03-09-2020, 08:36 AM
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#7 |
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Test before replacing
Join Date: Aug 2013
Location: Ohio side of the Pennsylvania border.
Posts: 3,495
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Re: 2pg Low compression after rebuild
The piston ring grooves have tiny alignment pins. The rings will only go in one position.
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03-09-2020, 11:55 AM
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#8 |
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Not Yet Wild
Join Date: Jan 2020
Location: Idaho
Posts: 10
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Re: 2pg Low compression after rebuild
Have new rings on the way I guess Ill take the engine out one more time and see whats going on. Ill measure piston and bore and check end gap this time. I have used a new head gasket each time I opened it up.
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03-09-2020, 06:35 PM
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#9 |
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Not Yet Wild
Join Date: Jan 2020
Location: Idaho
Posts: 10
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Re: 2pg Low compression after rebuild
Pulled head off engine it has streaks in the cylinder wall, what is causing this
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03-09-2020, 07:28 PM
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#10 |
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Vintage tech
Join Date: Sep 2009
Location: South
Posts: 3,215
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Re: 2pg Low compression after rebuild
What oil and gas mixture did you go with. I hope 50-1 ??
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