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Old 04-23-2016, 01:20 PM   #1
Mvettori
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Default '92 Marathon Engine Overheating issue

I recently took ownership of a '92 EZ-Go Marathon. The engine appears to be overheating after about 15 minutes or so of driving. It overheats to the point where the plywood seat bottom has a black charred spot that sits over the muffler. It is air cooled...the fan appears to be working, and I pulled the engine cover and there isn't anything that would obstruct air flow from the fan.

Has anyone seen this before and could possibly point me in a direction on how to resolve it?

Thanks in advance.
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Old 04-23-2016, 02:04 PM   #2
amesmotorsports
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Default Re: '92 Marathon Engine Overheating issue

Yes mine burned the seat up.
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Old 04-24-2016, 08:16 PM   #3
Mvettori
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Default Re: '92 Marathon Engine Overheating issue

One clarification...the burn mark on the bottom of the seat is directly over top of the muffler. I'm not sure if the muffler simply needs replaced, or if the seat is old and is sagging close to the hot muffler.
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Old 04-25-2016, 05:07 AM   #4
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Default Re: '92 Marathon Engine Overheating issue

It's running, so I would doubt that a clogged muffler is running hot.
If it's running too lean, it could be running hot.

I would have to check, but I think my seat has a piece of tin above the muffler.
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Old 04-25-2016, 07:07 AM   #5
treeguy27
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Default Re: '92 Marathon Engine Overheating issue

I have a '91 which was acting similar. Check the main throttle shaft on the carb. Mine was worn and sloppy. It was sucking a lot of air in and running lean. I put a new Ebay carb on and it run much cooler and better.
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Old 04-25-2016, 08:30 PM   #6
Charles M
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Default Re: '92 Marathon Engine Overheating issue

I was having the same problem with my 89 made new seat frame and lined it with foil faced insulation for under the hood of a car found on ebay keeps the seat cool
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