I agree, if you go buy the book on these you will never get them tuned right. You need to remove the limiters so you can actually tune it correctly. Also I have not seen one engine despite the brand or cost that hasn't had some sort of problem. Thats why they have warranties. In my racing days I was strictly an OS guy and they ran like a champ, but every so often I or someone at the track would get a bad one, same applies here. If it is truly bad and your tuning skills are up to par, then you should've sent it in for a replacement. I don't waste any time in doing so if I'd spent my hard earned money on something and it isn't right. Horizon kicks ***** in customer service and to think, you may in deed be missing out on your future prefered choice of engine. I have a buddy who is a OS/Saito guy and he always says that If I would've gotten the OS my planes would be faster, Well my Evo's have no problems keeping up with his OS's.. Also as I posted earlier, BE SURE you use the right plug, 4-stroke and not 2-stroke plugs.


Later