OS Max FP 40 control line stunt engine. This is a clean, low time engine that is in excellent condition. Compression is extremely strong, there is no perceptible wear in the crankshaft bushing or any of the moving parts. It has a .285 venturi with a Super Tigre type needle valve assembly. Glow plug lights up. Mounting holes have NOT ben enlarged. No muffler included but if you win the auction and want a muffler let me know BEFORE you pay. After you pay I cannot add anything to your order.