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Mate.2 stroke motors WITH oil injection run between 100/1 and down to 40/1(rich).With yours being pre-mix,it should run at 50/1 to be safe.Using a good quality 2stroke oil,with low smoke,it should run well.The only thing that may change, is how you use the motor.Slow trolling or running along travelling.A spark plug that is 1 heat range hotter will help burn the fuel/oil mixture if you do a lot of slow running.Faster and /or high speed running,will keep your plugs ok.These are safe guides not to cook up a piston.Hope this helps you
You should have a High Speed carb adjust and a Low Speed carb adjust. If it's running fine while idling, adjust the high speed setting. If you have two nobs, its the lower one. May be set wrong. If you don't have two nobs, remove the carburator and check the jets to make sure they are completely clean or better yet, order yourself a carb rebuild kit to take care of all of this. I just rebuilt my 1971 evinrude 4hp and the carb kit made the world of difference.
Ok good that you have fresh fuel at all times :) I would be having the carburettors dismantled and cleaned and a carb overhaul kit installed when you can. Carbs have low speed idle settings and high speed jets. Often these passages get blocked up woth gum or other foreign accumulations and cause running problems and fuel delivery issues.