Compression 35hp lark 1958

[beach]

I checked compression and read 72 psi top, 90 psi bottom. This is with the valves closed(screws backed out).<br /><br />What is the normal, acceptable reading?<br /><br />What is the procedure for adjusting the valves to assist in pull starting?<br /><br />I have ordered a manual but have nothing else to do this weekend.

 

[Joe Reeves]

Re: Compression 35hp lark 1958

Beach... You don't say whether the compression readings were taken with a electric starter or by using a manual starter. The readings could vary slightly using a manual starter, but eighteen (18) pounds difference would indicate that something is amiss. The reading should be even on both cylinders, and in the 100 psi range.<br /><br />The gap setting of those compression release valves valves would be .020 .

 

[beach]

Re: Compression 35hp lark 1958

Readings were by pull rope, 4 brisk pull on a cold engine.

 

[beach]

Re: Compression 35hp lark 1958

I took new readings this morning a got:<br />102 top<br />108 bottom<br /><br />It was late last night and dark, maybe I didn't have the gauge screwed in enough, I don't know.

 

[Joe Reeves]

Re: Compression 35hp lark 1958

Beach.... Sounds good, glad to hear that. Good luck.