Hi Jim
I think the fuji 50 is a 46cc motor. Have you checked out Troy built models ? They sell EMS gen v retracts at a great price and they look very nice, the kit comes with wheels all three with aluminum rims air valve, lines and tank set up for $139.00, I orderd a set for my corsair.http://www.troybuiltmodels.com/items/ESMCORSAIR74.html
Check it out. I will let you know how they are when I get them.
Clay