Reply To: ‘79 Johnson 25 hp

[Geer Pyron]

Frank,
No. I only used the tachometer to help with diagnosing the issue.
Because I suspected one cylinder wasn’t working right. I used the tach to figure out if I was right and which one wasn’t working right.
The #s off the lower plug wire were way lower than the top.
800 plus or minus vs 400 plus or minus.
At idle, in gear.
I have another power pack.
Should I put it on and take back to the lake? Again.
Tell me I’m way off base, but could something be wrong with cylinder head? Head gasket? Or the other gasket (it has the water jacket head covering). Maybe water getting into that lower cylinder and thus preventing it from firing as it should?
My bother in law suggested stuck reed valve. Any chance?
Thanks for your help
G

JMGP