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| Gas EZGO Gas EZGO Marathon, Medalist, TXT and RXV. |
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10-19-2015, 05:12 PM
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#1 |
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Not Yet Wild
Join Date: Feb 2012
Location: Central Missouri
Posts: 74
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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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10-19-2015, 05:14 PM
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#2 |
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Not Yet Wild
Join Date: Feb 2012
Location: Central Missouri
Posts: 74
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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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10-19-2015, 07:15 PM
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#3 |
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Gone Wild
Join Date: Feb 2008
Location: Brooklyn, Michigan "Home of M.I.S."
Posts: 3,666
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Re: 88 EZGO Marathon 2 stroke help w/compression
Did you test it with the throttle open?
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10-19-2015, 07:39 PM
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#4 |
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Not Yet Wild
Join Date: Feb 2012
Location: Central Missouri
Posts: 74
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Re: 88 EZGO Marathon 2 stroke help w/compression
Yes with throttle open and closed
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10-19-2015, 07:47 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: 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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10-19-2015, 08:07 PM
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#6 |
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Not Yet Wild
Join Date: Feb 2012
Location: Central Missouri
Posts: 74
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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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10-20-2015, 05:04 PM
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#7 |
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Not Yet Wild
Join Date: Feb 2012
Location: Central Missouri
Posts: 74
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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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10-20-2015, 05:15 PM
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#8 |
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Not Yet Wild
Join Date: Feb 2012
Location: Central Missouri
Posts: 74
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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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10-20-2015, 05:38 PM
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#9 |
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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: 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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10-20-2015, 06:26 PM
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#10 |
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Not Yet Wild
Join Date: Feb 2012
Location: Central Missouri
Posts: 74
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Re: 88 EZGO Marathon 2 stroke help w/compression
Okay thanks.
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| compression rebuild 2pg |
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