I was looking online at a mud buddy frame not sure what size engine was on it its the frame shaft prop whole nine yards and the fella wants 500 for it but i also found 2 motors that were complete for 600 dollars i already have a brand new engine and would like to use that just curious what price would be fair i am not trying to pay 500 if i can cut my engine losses and get a while kit for 600any inout wiould be greatly appreciated