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Gas EZGO Gas EZGO Marathon, Medalist, TXT and RXV. |
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08-18-2011, 02:00 PM | #11 |
Gone Wild
Join Date: Oct 2009
Location: Manitoba, Canada
Posts: 363
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Re: 1983 Marathon Engine Trouble
If you have access to a machine shop, you can get these jugs bored out, and there are oversize pistions available for the engine (click on the site sponsor link at the top). Just note that the tolerances on these engines are very tight (.007" between the cylinder and the jug). A much cheaper way to do the rebuild if you have access.
If the cylinder isn't damaged, you can always hone it out, and try some upsized piston/ring combos, but the learned folks here suggest that these cylinders wear out of round. Might be worth a try if you wanted to go the cheapest route - just make sure you've got a good inside micrometer before pursuing this. |
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08-18-2011, 02:36 PM | #12 |
Not Yet Wild
Join Date: Aug 2011
Posts: 22
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Re: 1983 Marathon Engine Trouble
thre are engine shops around here that should be able to redo the cylinder and many machine shops also in the area. as for damage to the cylinder when I lowered the piston it looked and felt nice and smooth. the piston is what looked a little beat up on top and on 2 edges. it looked like tool marks on the edge. this weekend I should be pulling the cylinder off to look at the shape piston the rings and cylinder are in. to me it looks like the piston took most the wear.
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08-18-2011, 02:59 PM | #13 |
Not Yet Wild
Join Date: Aug 2011
Posts: 22
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Re: 1983 Marathon Engine Trouble
the other thing is without a service manual I have no idea how to remove a muffler on a 83 since it is the only year of that style
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08-18-2011, 07:26 PM | #14 |
Respect the Cart
Join Date: May 2010
Location: Rocky Mount, Virginia
Posts: 2,190
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Re: 1983 Marathon Engine Trouble
oops posted in the wrong place
Last edited by Dave Box; 08-18-2011 at 07:28 PM.. Reason: . |
08-27-2011, 08:30 PM | #15 |
Not Yet Wild
Join Date: Aug 2011
Posts: 22
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Re: 1983 Marathon Engine Trouble
The piston inside engine looks like its missing a ring and cylinder does not look the best
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08-27-2011, 08:54 PM | #16 |
Gone Wild
Join Date: Oct 2009
Location: Manitoba, Canada
Posts: 363
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Re: 1983 Marathon Engine Trouble
Still thinking a top end kit might be the way to go. Once you add in how many hours you'll waste if the rebore doesn't work, it seems like "better safe than sorry" might be a good mantra.
Hard to tell looking at the cylinder photos, but the piston does look cooked on it's top ring. Likely means significant cylinder damage. |
08-28-2011, 02:19 AM | #17 |
Gone Wild
Join Date: Feb 2011
Posts: 1,515
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Re: 1983 Marathon Engine Trouble
Bet I know where the dents in the piston came from. A broken ring ?????
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07-11-2013, 04:37 AM | #18 | |
Not Yet Wild
Join Date: Jul 2013
Location: Sale Victoria. Australia
Posts: 22
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Re: 1983 Marathon Engine Trouble
Quote:
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