I just got a old shuttle z heli. it has an o.s. max 28f engine on it. It was gummed up so bad you couldn't turn it over. I got it all tore down now but the piston ring broke trying to get the piston off the crank. besides that the engine is in great condition. i know orginal parts are hard to find for the engine but is there anyway to upgrading that piston and ring. Any ideas or thought would be great thanks..... [8D]

Contact Bax in the OS Direct Support forum but that motor hasnt been around in a while, you might be better off getting a 32, Ricks was selling them for 99 bucks to clear out his stock. If thats out of stock the OS37 should fit.