I began with the Kadet LT40 and the .46Fx. Way more power than needed and I eventually changed to a .32 Fabc made by OS and then after a wreck put an old .46LA in it. I realy preferred the LA powerwise, it is a great match and it costs about one half of the AX or FX series and still use it as a trainer. Lots of fine .46 sized engines made which are cheaper than OS, consider Magnum, GMS and others. OS is a good motor but no guarentee any better than any other. My first /46FX had a sleeve peel and ruined the engine and OS just said that is too bad, I am just one of many. I will say I have bought 3 others since then however.