Compression Test Results

Posted by Myumi-2 on
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Compression-Test-Results-tp458238.html

I have a 1972 CB 750 with 60,000 miles on the clock which is returning to life after 20 years in a shed.

I have had the engine running and decided to perform a compression test.  The results were:

150
90
150
150

Wet test results were:
160
110
170
160

Whilst 150 is at the bottom end of the text book range (150-170) I think it is still acceptable.

Clearly cylinder 2 has a serious problem.

Can anyone interpret these results and the possible problem???

Thanks in advance.
Tim