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  #1  
Old 1 Week Ago
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Default Compression test results

Ok so I'm ready to hang myself...compression test on rear cylinder was 80 and front was 75..so I have a problem yeah guys?? Thoughts, suggestions cause I have no idea ....but glad I did it...freaking timing was good the whole time I'm sure...

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Worn Rings or Worn Valves (or hanging up - or not adjusted correctly)...

Leak Down Test should provide the source of lost compression...
http://sportsterpedia.com/doku.php/t...:ref:svcproc21


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Originally Posted by IXL2Relax View Post
Worn Rings or Worn Valves (or hanging up - or not adjusted correctly)...

Lead Down Test should provide the source of lost compression...


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I just put a bit of oil in the spark plug holes....it went up a bit...rear went to 115 n front at around 105

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Now w that I'm suspecting valve because it's the rings that seal yeah? But if ya go n put new valves wouldn't ya do new rings too since your there?

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Did you do a dry and then wet test, with WOT?

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adding the oil effects ring seal (improves) does not effect valve seal.double check your pushrod adjustment.too tight and the valves won't close,losing compression.you mentioned they were too tight before.
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What compression tester are you using? It it doesn't have a schrader valve in the end of the hose that screws in the head, it's going to read low.
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It will also read low if the engine is not warmed up.
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Originally Posted by 60Gunner View Post
What compression tester are you using? It it doesn't have a schrader valve in the end of the hose that screws in the head, it's going to read low.
It's got the Schrader valve on side so just push in and releases the pressure

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Originally Posted by brucstoudt View Post
adding the oil effects ring seal (improves) does not effect valve seal.double check your pushrod adjustment.too tight and the valves won't close,losing compression.you mentioned they were too tight before.
I'll double check but they were adjusted about a month ago

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