RE: RCV motors.
"The exhaust: if it has the press in end it WILL blow off. Weld it in or replace with an OS muffler."
I can attest to that, too! If they don't blow completely off they will at least start vibrating around making noise (and presumably if you don't replace in short order, it will wear to the point where it blows off). RCV really needs to address this design flaw, if they haven't already (I've not bought a new RCV motor in the past 2 years, but my original 90SP had to have the muffler replaced even before the 1st gallon of fuel had been run thru it... RCV did send me a much better replacement muffler free-of-charge much to their credit!).
These SP's are still awesome engines though, and they hold their value better than any model aircraft engine I've ever seen if you chose to resell it! I've seen used RCV SP engines sell on Ebay for more than retail new! I haven't seen much marketing (here in the States at least) by RCV though, I don't know why they don't market more aggressively.
- Michael