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Old 11-20-2020, 02:53 AM   #1
yknotdad
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Default 1986 Marathon compression

I'm working on a buddies cart (1986 Marathon) and it seems to run great in forward but wont start in reverse. Have spark in both fwd & rev however compression test is showing 110 in forward direction and 50 in reverse direction. Would this indicate crank seal bad? or?? What are we missing here?
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Old 11-20-2020, 07:41 AM   #2
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Default Re: 1986 Marathon compression

Seals don't affect compression.
Changing direction puts a different side load on the piston. I would be inclined to think rings and out of round cylinder.
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Old 11-20-2020, 10:29 PM   #3
yknotdad
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Default Re: 1986 Marathon compression

Thanks....makes sense. I’ll see if I can get motor out and opened up this weekend to bore gauge for out of round and check rings.
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Old 11-21-2020, 10:09 AM   #4
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Default Re: 1986 Marathon compression

It's also weird to think that reverse would wear out before forward.

You could remove the exhaust pipe, and take a good look at the piston before removing everything.

You will find the 85 manual here. https://buggiesgonewild.com/showthre...=105501&page=3
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Old 12-04-2020, 12:58 AM   #5
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Default Re: 1986 Marathon compression

Thanks for the help Cart around...sure enough when we pulled the piston she was a bit scored with the rings collapsed in 2 areas. New piston kit and honing the cylinder and BAM she's good as new!!
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Old 12-04-2020, 12:01 PM   #6
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Default Re: 1986 Marathon compression

Glad to hear that. I was slightly concerned about that diagnosis.
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Old 08-04-2021, 09:40 AM   #7
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Default Re: 1986 Marathon compression

Quote:
Originally Posted by yknotdad View Post
Thanks for the help Cart around...sure enough when we pulled the piston she was a bit scored with the rings collapsed in 2 areas. New piston kit and honing the cylinder and BAM she's good as new!!
Do you mind telling me where you got the parts? I am about to pull the engine on my 86.
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