Its gas with electronic ignition. I haven't changed the rod over to needle bearings yet. I'm just going to run extra oil and see how it runs like that . After doing some reading it seems that if you run 20% oil there shouldn't be any problems. Later if it seems worth it, then I'll go ahead and send it to Ken for the needle bearing mod. He said it would run me about $75 or so. I already have about $250 invested, so the conversion was not cheap. I just always wanted to do one.