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01-07-2010, 12:59 AM
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#1 |
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Not Yet Wild
Join Date: Jan 2010
Posts: 10
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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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01-09-2010, 01:28 AM
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#2 |
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Gone Wild
Join Date: Aug 2007
Location: North Texas
Posts: 2,314
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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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03-19-2010, 12:16 AM
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#3 |
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Not Yet Wild
Join Date: Jan 2010
Posts: 10
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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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03-19-2010, 12:37 AM
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#4 |
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Gone Wild
Join Date: Aug 2007
Location: North Texas
Posts: 2,314
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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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03-19-2010, 01:14 AM
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#5 |
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Not Yet Wild
Join Date: Jan 2010
Posts: 10
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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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03-22-2010, 11:21 AM
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#6 |
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How Can I Help?
Join Date: Oct 2009
Location: SW Wisc & West Central, FL
Posts: 1,418
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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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03-24-2010, 09:26 PM
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#7 |
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Not Yet Wild
Join Date: Jan 2010
Posts: 10
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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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03-25-2010, 08:56 AM
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#8 |
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How Can I Help?
Join Date: Oct 2009
Location: SW Wisc & West Central, FL
Posts: 1,418
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Re: 81 HD gas low power no speed
And extra parts when you were done?
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03-25-2010, 01:28 PM
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#9 | |
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Gone Wild
 Join Date: Jul 2008
Location: Reddick IL
Posts: 11,278
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Re: 81 HD gas low power no speed
Quote:
 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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03-25-2010, 10:08 PM
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#10 |
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Not Yet Wild
Join Date: Jan 2010
Posts: 10
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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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