RE: worst engine ever
Ed,
Mine did not break the piston but, trying to run it after break in, I had some dead sticks and crashed the airplane. I finally knew that it (mine) only runs properly on 30 % nitro. I send it back to YS performance but they did not repaired the engine. I can not use it as 30 % nitro is extremely costly in our country. It is not only my case, a friend of mine that has a 91 FZ too, crashed his model for the same reason, he used 15 % nitro instead 30 % and had a fatal dead stick.