Well I must say, it was a very powerfull engine during its short life, I have been into R/C since 1976 and I have had many engines, AIR/ truck/car and marine, and diesel conversions.. and this sts .28 was NOT the worst I had, my main problem with it was NO ONE had the one way bearing. no one in my area can get parts. I guess my problem was that I got it off ebay.. NO more for that.. before I got the sts .28 I read a lot of good about it, then once I had my problems with it, I check'd other forums (RC Universe) and they didn't have any good to say about it? Like I said before I was impressed with it. in the beginning. it did what I wanted to do with it. Bit this WERKS COLLARI .32 is an awsome engine. cost only 159.95 at a LHS. Plus it is doing twice of what I want it to do.. I am sorry if I hurt any ones feelings, but maybe I just got a lemon!