150 johnson

[sal g]

wot rpm is 4200 used to be 520

wot rpm is 4200 used to be 5200 & makes a funny noise at wot like a knock but when you back off throttle it goes away

 

[haffiman37]

Any damage to any spark plug?

Any damage to any spark plug? Would not be surprised if you have a damaged piston.
What year mod are we talking about?

 

[Sleeper]

Try a compression check. It s

Try a compression check. It should tell you all sorts of things.