Home › Forum › Ask A Member › 18HP saga continues. Can’t get past 14mph and 3,900 RPM. › Re: 18HP saga continues. Can’t get past 14mph and 3,900 RPM.
3 different power heads: I never ran the original powerhead on a boat. The ebay powerhead I did run on the boat, it had a bad missfire at idle, but cleared up at nigher RPMs. The piston scoring was done before I got the powerhead. Same for the 3rd powerhead, I inspected it before running it. The pistons were not damaged by me.
I’m running penzoil TC3 oil at 40:1. The smoke is blue. i’ve never seen anything but blue from a 2 stroke. It does consume a ton of fuel, I think it uses more than it should but I don’t have any experience with these small motors. I’ve never heard of gas washing out rings on a 2 stroke, that’s more of a 4 stroke thing. The port timing can’t be the issue.. these are simple crossflow motors, no has messed with the porting on either of the two powerheads I’ve fun.