just measure the inside of the carb in millimeters, then call Walbro and ask them to recommend a crab for you, make sure you tell them you are going to burn alcohol/nitro ,

or fined another 30cc/32cc glow motor that uses a Walbro and buy a replacement carb for that motor for your Maxi..

by-the-way,, I don't know much about the Maxi, but OPS plane and boat motors are among the best motors you can buy !!

Jim