ORIGINAL: DJevader

I bet the piston and sleeve are worn down it's very common with DTX .18's. I ended up buying a WASP .18 ($100)it's a direct bolt on and LOTS more power. How much fuel have you ran through it probably 1 3/4 a gallon. When you run it does it over heat easily? It's very common with DTX .18's and it's usually the piston sleeve. Try to fix it some other way first, but send it back to the factory to get the sleeve replaced if you still have the warrenty. The sleeve is made of cheap copper so it doesn't last long. Once again don't go out and buy a knew motor. Try typing in " DTX .18 engine problems" in the search box, I had this problem a few months ago with my car and posted a thing here and they knew exactly the problem i'd read throught it it's got tons of troubleshooting.