i have a tecumseh twin that i use on a pulling tractor. i love everything about the motor i have gone through the heads and put the 17 hp carbs on it. it pulls great all the way down the track but at the end it looses all its grunt. most guys that pull run real heavy flywheels like 25 or 30 lbs. by doing so it is hard to bring the rpms down and bog it down because of so much more rotating mass. ds anyone have any ideas of what i can do or know of where i can buy something to make it work. no one runs these engines to pull with but i love it so much i couldnt change. thanks for all your help