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Old 10-19-2015, 05:12 PM   #1
csall1
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Default 88 EZGO Marathon 2 stroke help w/compression

I know it has been awhile. I have a 1988 marathon. We rebuilt the engine. Took it to a machine shop and had them bore it and fit a .50mm piston. He also shaved .0018 off the head. The machinist is an old timer that said he had done hundreds of 2stroke Robyn engines. Anyway got injured in a dirt bike accident and the engine sat for over a year. I just put it back in the cart and compression is 90 psi both ways. Battery was a little weak put the jumper pack on and got 100psi. I was hoping for at least 140psi. Any thoughts.
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Old 10-19-2015, 05:14 PM   #2
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Default Re: 88 EZGO Marathon 2 stroke help w/compression

I replaced crank bearings, both crank seals, and all gaskets. I tried squirting some oil in the cylinder no change in compression.
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Old 10-19-2015, 07:15 PM   #3
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Default Re: 88 EZGO Marathon 2 stroke help w/compression

Did you test it with the throttle open?
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Old 10-19-2015, 07:39 PM   #4
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Default Re: 88 EZGO Marathon 2 stroke help w/compression

Yes with throttle open and closed
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Old 10-19-2015, 07:47 PM   #5
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Default Re: 88 EZGO Marathon 2 stroke help w/compression

Is the piston in with the hole facing the intake side, and the rings with the bevel side up?

You may also have to run it a bit for the rings to seat, and then get a good seal.
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Old 10-19-2015, 08:07 PM   #6
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Default Re: 88 EZGO Marathon 2 stroke help w/compression

I already thought of that I guess I better check it when I get home from work tomorrow. Thanks.
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Old 10-20-2015, 05:04 PM   #7
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Default Re: 88 EZGO Marathon 2 stroke help w/compression

Yes piston is in with hole facing away from exhaust port. I couldn't tell if the rings were bevel up. I am sure they are I always do them that way on 2 stroke dirt bikes.
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Old 10-20-2015, 05:15 PM   #8
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Default Re: 88 EZGO Marathon 2 stroke help w/compression

http://www.buggiesgonewild.com/album...ictureid=24013

This is a picture of my piston through the exhaust port maybe you can see the rings and tell if the bevel is up. Thanks.
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Old 10-20-2015, 05:38 PM   #9
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Default Re: 88 EZGO Marathon 2 stroke help w/compression

Bevel is on the inside, so can't tell. If it went in easy, it is right.

140 compression is with a warm engine. I would run it for a while, and then check again after it breaks in.
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Old 10-20-2015, 06:26 PM   #10
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Default Re: 88 EZGO Marathon 2 stroke help w/compression

Okay thanks.
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