I got two .90 Supertigers just setting here collecting dust. I got a ignition now that actually works to place on it. I need to know what walbro or zamba carburator to put on it. Then I can take a piece of round stock and cut out a adapter from round stock aluminum. Or I could try and run it with the stock carb on it. I also have Klotz oil to mix in fuel. I bet on a plane in a slight dive and down the runway, a gas powered .90 engine would sound great on spark ignition! Capt,n P.S. More oil = more power!