I was having the problem with my 115 yamaha (1985) engine oil tank overflowing into the lower carb. after checking both oil tank floats i found that the control module was bad,after watching this high price oil go to waste,i came up with this idea that will be a vast improvement ,i used a small fish tank hose the same dia.of the engine oil tank overflo tube and routed it back to the main oil tank,drilled the correct size hole,and now any overflo goes back to the tank rather than in the carb.or on the ground...works...after replacing the controller my system now works fine....the overflo tube is staying in...try it and save some bucks on oil....
