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Old 07-10-2020, 04:30 PM   #1
God of Thunder
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Default EZGO Marathon - Turns over but doesn't start! (another one!)

Hello! First post and first golf cart! I picked up this very nice 1991 EZ-GO today. I - admittedly - do not know much if anything about them other than press the pedal and it goes. This one - it seems the engine spins up, but doesn't actually engage the clutch? Is the engine even coming on? I don't quite understand how these motors work (2-stroke)....is it always "on"? I took a video here, the belt seems extremely lose but I don't see the clutch coming closer to the crankshaft to tighten the belt - which I think is the problem. I am just not sure if that means the engine isn't on - or if there is a problem with the clutch area?!

I took a video - but I guess I have to be a member for 7 days to post it!

Can someone please help educate me a little on this machine?!

After some learning - and actually posting this in the electric section first - I have learned that this means that the engine is turning over but is not actually starting! I'm going to start with a compression test here soon and confirm that I have spark.
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Old 07-10-2020, 04:40 PM   #2
StoveBolt
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Default Re: EZGO Marathon - Turns over but doesn't start! (another one!)

Sounds like it's not running, in the reply box click on the paper clip in the tool bar to upload video.
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Old 07-10-2020, 10:44 PM   #3
God of Thunder
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Default Re: EZGO Marathon - Turns over but doesn't start! (another one!)

Alright - interesting (and probably not good) turn of events here....

I got a compression tester thingy from O'reilly's, and it showed about 50. My grandpa said to try putting some 2-stroke oil in there (spark plug hole) and taking a new reading because the oil could seal the ring (he was a mechanic in the 80s). I did that and got a reading of 120. So I put the spark plug back in - tried it - and nothing. I then took another reading and got 60 again. So I tried a bit more oil - took it again - and got 120....then I did it immediately again, and got 60. So that's where I am - but it's looking like compression is the likely issue here.
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Old 07-12-2020, 10:53 PM   #4
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Default Re: EZGO Marathon - Turns over but doesn't start! (another one!)

Alright! Took the head off the engine, and the piston definitely has some play. Will be doing a rebuild on it. I see a lot of people say to replace the crank seals, is that just something like these?

https://www.golfcartgarage.com/ezgo-...4aAnyAEALw_wcB
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Old 07-13-2020, 07:29 AM   #5
cart around
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Default Re: EZGO Marathon - Turns over but doesn't start! (another one!)

Buy two of those. Make sure you put the piston in the right direction, and the rings bevel side up. I will have your manual when I get home.

This is a link to the 3pg manual. Every chapter is a separate pdf file.
https://app.box.com/s/3habgxrtgz
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