Well, I've found a .32 SX with Macs muffler on EBay and I'm going to build an engine mount and rebalance
it in the next couple of days (the weather is surprisingly good right now).

I think I should probably upsize the gas tank though (from 4 to 6 oz) given the fuel consumption
of the .32 SX (which has to be more than the Fox 29). Do you think I can get five minutes
from a 6 oz tank (or more?).