I purchased a MOD.20G that was only used with the snow plow .The motor runs goog with good compression.The PTO shaft spins freely when not engaged.I installed a 60 in. mower deck. the mower runs good,the tractot runs good and seems to have plenty of power.whenI engage the mower and try to move forward the moter seems to be over loaded and dies.I have 2 other 20g"s and neither one has this problem.