Changing to predominately four stroke so these engines are not required. 1. OS AX75. 2.OS AX95. both of these engines are in excellent condition with very strong compression and smooth bearings, neither have done much flying. The 95 is fitted with bisson(BCM) style muffler also has the original muffler. Asking price for the 75 is $175. the 95 is $220 negotiable on both.