I agree, that's a lot of carbon build up if the plug has only run 8hrs.
It would suggest it's not 2 stroke oil that's burning and creating that carbon build up, that's why Zman and Memphis2857 have suggested checking/replacing right side crank seal.
If the seal is failing it will suck gearbox oil/air into the combustion chamber.
Gearbox oil isn't designed to burn in the combustion chamber and will leave a carbon build like you've got.
Sucking air/oil through your crank seal will also play havoc with your mixture/jetting.
In my opinion it's worth checking/replacing.
Last edited by Davehuge; 11-25-2018 at 12:36 PM.
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