Compression of a 1969 20 Johnson

[nimmor]

I read some of the articles about white smoke and one of them mentioned checking the compression for a blown head gasket. So my question is does anybody know the correct compression of a 1969 20 H.P. Johnson?

 

[ob]

Re: Compression of a 1969 20 Johnson

Expect pressures around 100 psi and within 10 % of each other.Insure throttle flaps are wide open when performing.