this is my poulan25cc.16x6 mas wood.stock muffler gutted.stock 1 needle carb(walbro).7400 rpms 3000ft sea level.6.5-7 lbs thrust with fish scale hooked to tail.hand starts first or second flip everytime with stock ign.3.25 lbs as in pic.flew my sons D-V111.at 14 lbs but barley.(I WONT TRY THAT AGAIN!) and dont suggest anybody else either.i got it down fine and safe but why not,gravity was working with me.cost me $25.00 to convert.