You can get parts at Central Hobbies. The most important ting about the YS engines is the regulator/fuel system. Aside from that it is no different from any other 4 stroke in terms of handling. Most guys who have issues tuning them are not allowing the fuel tank to come up to full pressure before making adjustments. Always start with the regulator screw flush with its housing. This in most cases will be a bit on the rich side. Get the engine running and advance to about 1/4 throttle and let it run for at least 20 seconds. Lower the throttle and then slowly advance to full throttle. In most cases if the high speed needle is lean the engine will sound like it is struggling during transition. If you continue to advance the throttle there is a good chance you can throw a prop. When the high speed is too rich, you will actually hear a slight drop in RPM just as you hit full throttle. It will take some fiddling of the regulator screw and the high speed needle to get them working in unison. Filters are very important, YS engines will not tolerate any debris in the system. I reccomend the YS filter clunk and the use of a filter just prior to the regulator. You can always call Richard Verano at YS sales and service. He is very personable and wants to help guys have a positive experience with their YS engine. He is currently here in Sacramento at the Warbird Pylon Nationals but should be back working on engines and taking calls on Wednesday.