I also use a RB X12 5 port turbo engine and the power and speed is very good, not a real match to the RTU but close. It also is very expensive to rebuild. Piston,piston pin, sleeve and rod, will sit you back over $110. I purchased my RB when the prices were alittle lower than they are now, it was only $187 then and now they are over $200 . So rebuild it or buy a new one? Its sorta a toss up. I ran about 2 and 1/2 gallons of 30 percent fuel threw it before rebuilding it. The compression was still ok but the big end of the rod bushing was out of spec.
