I must have. It's been a great engine, easy to break in, easy to tune, and it stays tuned. It still has the original plug in it after more than 5 gals. I got it before I had heard of RCU so I had never read all the bad stuff about it. It's the only nitro engine I've seen that the manufactures break in is the temp cycling method. The one problem I think people have is they try to tune the midrange. I closed that needle when I was sealing it up (out of the box) and I've never touched it sence. It has plenty of power in the MGT. the pull start was crap so I put a tiger drive on it.