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Old 01-07-2010, 12:59 AM   #1
docaz
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Default 81 HD gas low power no speed

Just bought a 81 HD four wheeler($100.00),runs but lacks power. I have noticed it's throwing oil from aroud pulley that drives starter/gen. I'm guessing this could cause a loss of power. Am I correct ?
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Old 01-09-2010, 01:28 AM   #2
tew45
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Default Re: 81 HD gas low power no speed

I would be sure you have the proper oil/gas fuel mixture first. Then if things are not right (compression should read 85 to 90 PSI and correct timing) I would suspect the crankcase seals.
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Old 03-19-2010, 12:16 AM   #3
docaz
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Default Re: 81 HD gas low power no speed

I shall answer my own question. Yes, leaking seals can cause a lack of power.
Compession was about 65psi when it ran but leaked oil at clutch side seal.
Compression is now 30psi, wont run and clutch side seal is toast.
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Old 03-19-2010, 12:37 AM   #4
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Default Re: 81 HD gas low power no speed

You might get by with a set of rings but the compression is just too low. Also replace both crank seals. Time it in forward and reverse and you should be running very good.
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Old 03-19-2010, 01:14 AM   #5
docaz
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Default Re: 81 HD gas low power no speed

Thanks, for now I plan on just replacing the crank seals and the drive belt. Once I do the seals I will check the compression again, it might need rings but not today.
Trying to find parts locally is not easy in SE Arizona.
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Old 03-22-2010, 11:21 AM   #6
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Default Re: 81 HD gas low power no speed

Don't forget the parts manual is on www.buggiesgonewild.com/columbia-parcars in the HD section. It might help finding parts, even in Arizona. If nothing else, you'll know how to put it back together!
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Old 03-24-2010, 09:26 PM   #7
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Default Re: 81 HD gas low power no speed

Putting it back together is not a problem,I like puzzles.
I disassembled the engine in my '71 international pickup, five years later I put it back together without a manual, and yes it runs.
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Old 03-25-2010, 08:56 AM   #8
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Default Re: 81 HD gas low power no speed

And extra parts when you were done?
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Old 03-25-2010, 01:28 PM   #9
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Default Re: 81 HD gas low power no speed

Quote:
Originally Posted by Tech Support View Post
And extra parts when you were done?

I had a friend that rebuilt his old v8 and had it almost all together when he found the coffee can full of mushroom cam followers.
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Old 03-25-2010, 10:08 PM   #10
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Default Re: 81 HD gas low power no speed

Not real sure about extra parts, did need to find a radiator, transmission mount, and clutch linkage.
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