So last nite i went to run my arena tr after supper and made it about 25 ft. after it fired and blaahhhh. died-so no big deal grabbed my glow igniter and went to pull the cord-stuck-hmmm? pulled harder-nothin-hmmmmm? so i took it in the house and tore it down only to find pieces of metal and alum. in my case-now the piston and sleeve looked fine and i cleaned every thing an deburred the sharp edges and put in a fresh plug and it fired after the first pull-didn't run great and soon stalled and fouled the plug-my ? is now what the engine only has 12 or so tanks through and has never gotten hot I just dont really know what to do-pretty new to nitro-CEN tech support please help!!