Compression on old Atwater and Rude?

[bonito1]

Hello all,

I am going to look at an old Evinrude and Atwater outboards. I plan to check compression before purchasing but do not know what readings I am looking for. Can anyone tell me what a good reading would be for these.

The fellow is asking $75 a piece, sound reasonable?

Also, what size spark plug socket do you think I'll need?

I've attached pics if this helps.

Thanks

 

[F_R]

Re: Compression on old Atwater and Rude?

Price depends on what you guys agree on. The Evinrude is an antique and probably worth it. Sorry, I don't have specs on the compression. Plug wrench most likely is 13/16" on the Scott-Atwater. Can't say on the Evinrude. Might be an 18mm thread size plug (?) Trusty Crescent wrench will do it.

 

[steelespike]

Re: Compression on old Atwater and Rude?

60 psi And even between cylinders would be real good on those old hand cranked boys.

 

[JasonAych]

Re: Compression on old Atwater and Rude?

The Evinrude is 1939 - 1941 Handitwin. I have one and it runs excellent with 65 psi, both cylinders, on a snap-on guage. The coils tend to be bad on them so check for spark. The plugs are 18mm threads.

I have 2 videos of mine on youtube. Search on Handitwin.

 

[JasonAych]

Re: Compression on old Atwater and Rude?

Elto Handitwin to be exact.