RE: Triceptor 1 Engine Upgrade
First and foremost, OS is overpriced and oversold. If you want a *Good* reliable and less expensive engine, get a Thunder Tiger Pro .46. It's an OS SF clone but more powerful than the SF. The nickel plating doesn't peel on the TT like it does in the OS either. With a $60 Jettstream muffler, it'll wake up 1000-1500rpm over the stock muffler.
Asp and Magnum is another option, but quality control is hit and miss.