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Gas EZGO Gas EZGO Marathon, Medalist, TXT and RXV. |
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11-14-2007, 09:02 AM | #1 |
Gone Wild
Join Date: Oct 2007
Location: Virginia
Posts: 210
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87 Marathon with new motor down on power
I've just rebuilt my 87 Marathon with a complete new engine kit (crank, piston, rings, cylinder, bearings, seals) and it really seems to be down on power. This cart had been sitting for two years prior to the rebuild but before that, the power was also pretty weak which I attributed to the poor condition of the engine. Now that I can pretty much exclude the engine as being the cause of the power problem, I'm starting to look for other possible causes. I'm going to swap out the muffler with one from another cart to see if that may be restricted. I've also read on here that problems with the drive and/or driven clutch could reduce power output. Is there any way to diagnose if those are the cause of the problem?
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11-14-2007, 01:53 PM | #2 |
Gone Wild
Join Date: Jan 2007
Posts: 731
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Re: 87 Marathon with new motor down on power
Just take off the muffler. if it runs better without, thats a problem.
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11-14-2007, 04:35 PM | #3 |
Peanut
Join Date: Feb 2007
Location: Western Massachusetts
Posts: 656
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Re: 87 Marathon with new motor down on power
When you put the piston in, did you make sure the F was facing the flywheel. In other words, can you see a port in the piston from the exhaust port on the cylinder?
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11-14-2007, 05:31 PM | #4 |
Gone Wild
Join Date: Oct 2007
Location: Virginia
Posts: 210
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Re: 87 Marathon with new motor down on power
I put it in correctly but at the time, I didn't know what the "F" on the piston stood for. Since I replaced the piston, crank and rod, I just looked at how the piston was mounted on the old rod and mounted the new piston in the same direction. Most of the motorcycles I've worked on usually have an "I" for intake side or "E" for exhaust. I was wondering what the "F" meant and never even thought about the flywheel.
BTW: I think I got the problem solved. I just had the governor set too slow. Once I adjusted that, it's got pretty good power now. I still think I need to replace that old muffler though. After going for a 10 minute ride, smoke comes out of the tailpipe for the next 1/2 hour. It's probably got 20 years of oil and carbon built up in there. |
11-14-2007, 05:38 PM | #5 |
Peanut
Join Date: Feb 2007
Location: Western Massachusetts
Posts: 656
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Re: 87 Marathon with new motor down on power
I bet... mine was the same way. Also... the rings need time to break in... in time it will increase!
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11-14-2007, 06:26 PM | #6 |
WILD
Join Date: May 2007
Location: lebanon county,pa
Posts: 1,266
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Re: 87 Marathon with new motor down on power
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11-14-2007, 10:37 PM | #7 |
Peanut
Join Date: Feb 2007
Location: Western Massachusetts
Posts: 656
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Re: 87 Marathon with new motor down on power
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