I have a 1984 OMC SEADRIVE same as a 115 Johnson ran all of last summer problems here and there with power and idle but seemed to have that all worked out. Last October the lower unit went out and it sat for a few months until I could get it going again. In the process I pulled the crabs and intake everything looked good put on a different lower unit and started up good. Ran in the drive way several time no problems when I took it out I tried a different propeller and it was no good but motor ran fine. Put the old propeller back on and ran a few miles and burnt a piston. Damage is not bad no scoring on the cylinder wall.
Not sure where to go from here I figure it will run after I cleaned to the piston not much is gone but why did it burn. I premix. I tried to make sure the fuel was mixed up prior to running and after a fifty mile drive it should have been well mixed. When I first started it was running as good as it ever has for me. IT is old motor and boat with a 70 gallon tank last year we ran it out 30 miles several time have a few problem but always got it worked out.
My question is where should I go from here I can tear everything down no problem putting in a new piston is no big deal just time and a few bucks. I ran two stroke motor cycles for years and burnt a many pistons but could always figure out why this on has me scratching my head I see no problem.
Not sure where to go from here I figure it will run after I cleaned to the piston not much is gone but why did it burn. I premix. I tried to make sure the fuel was mixed up prior to running and after a fifty mile drive it should have been well mixed. When I first started it was running as good as it ever has for me. IT is old motor and boat with a 70 gallon tank last year we ran it out 30 miles several time have a few problem but always got it worked out.
My question is where should I go from here I can tear everything down no problem putting in a new piston is no big deal just time and a few bucks. I ran two stroke motor cycles for years and burnt a many pistons but could always figure out why this on has me scratching my head I see no problem.