I had 4 of these little jewels. One threw a rod, I bought a pair of Supertigre carbs for two, and I ended up modifying the carb on the last one. The two with the Supertigre carbs ran ok, and the one with the modified carb ended up running ok too......good engines....junk carbs....but that was my experience. I understand that some of these engines have given no trouble at all. I was just unlucky.....4 times[]