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Engine Compression Problem-

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Old Sep 14, 2008 | 08:56 AM
  #11  
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Originally Posted by vettedog72
Agreed, not likely to be rings and pistons UNLESS it has some racing pistons with high compression. It ought to be a very strong runner; if the only problem is hard starting when hot, get the auto compression release (for each cylinder head).
Everything is stock.
 
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Old Sep 14, 2008 | 09:53 AM
  #12  
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As stated get some competent wrench on your side. IMHO that compression is "Great". One it matches and two its a high number.

It showes that the pistons, rings and cylinders have a POSITIVE seal. Also as mentioned a leak down is the proof in the pudding.

So as for getting H-D to change your pistions and rings for a SLOPPY set that does not get that set of numbers your asking for trouble.

I question as also mentioned the oil PSI.

Additionally how long has that oil been in the engine? Is it fresh? Or have you over 3K miles on it?

And one other thing that I've forgot to mention, what is the condition of your battery? Have you had it load tested?
 

Last edited by Ram; Sep 14, 2008 at 09:56 AM.
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Old Sep 14, 2008 | 09:59 AM
  #13  
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I have seen high compression with bad rings, only a leak down will really tell you. What was the reason you were having the compression checked in the first place? Hard starting, excessive pinging that might help knowing what prompted you to take the bike in.
 
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Old Sep 14, 2008 | 10:43 AM
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I would get that compression done again, by someone else preferably/another gauge, something isn't quite right there me thinks, and to have that answer for the high readings ?
 
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Old Sep 14, 2008 | 11:56 AM
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Both cylinders exactly 60psi too high???? Hmmmmmm.. I think I would have someone else check it out..
 
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Old Sep 14, 2008 | 12:32 PM
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I should have stipulated in my post the bad rings did not make the compression high but the compression shown good even tho a ring was broken in several pieces. So just because the rings are bad does not mean the compression will be low or not equal.
 
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Old Sep 14, 2008 | 12:36 PM
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Yea like qualifying his measurement with a second gauge would be a no brainer.
 
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Old Sep 14, 2008 | 12:46 PM
  #18  
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Originally Posted by Donnylee
Yea like qualifying his measurement with a second gauge would be a no brainer.
Agree and to have both high, raises a "? mark for me". You really need a second opinion.
Sounds more like a timing issue with the cams or lifters.
 
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Old Sep 15, 2008 | 08:37 AM
  #19  
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Originally Posted by RoadKing_Al
Agree and to have both high, raises a "? mark for me". You really need a second opinion.
Sounds more like a timing issue with the cams or lifters.

As they searched for the problem, the lifters were already replaced.
 
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Old Sep 15, 2008 | 09:40 AM
  #20  
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bike is absolutly stock? no tuner? no ied? just like from showroom? does it run well?

only problem is hard start?

this should be an easy one.
 
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