I've got 3 of them. Extemely happy with all. Do just as flyboy says. De-glazing is very emportant especially sence the engine has probably been overheated. Also make sure the piston and ring grove are real clean. Dykes rings suffer from the malady of getting carbon or other junk under them between the top of the piston and the top of the ringand then things can go bad in a hurry. Also use no more than 5% nitro. Mine won't even tune on 15%. They're all over the map tryin to run with 15%.

Denis