Re: Western flyer Cruiser(aka AMF)
That's a nice looking bike. I like the seat, too. I've put heavy duty 2.125 wheels & tires on mid sixties Schwinn bikes with no problems so if you wanted to go with bigger wheels I think you could. Jim Davis did a build of a 57 Schwinn Corvette with pretty much the same cantilever frame, an HF engine and EZM tranny and it looks great. I'm starting on a 51 Schwinn cantilever and am going to use the HF engine on mine partly just to see what it's all about and to try doing a budget four stroke build. One thing you'll need with either engine is an extra wide one piece crank and if you use the HF will need to make or adapt a mount. Jim said he had to offset the engine a bit to make the chain line up with the rear wheel sprocket. I kinda hope you do the HF so I can compare notes... & pick yer brain.
Whichever engine you use, it's going to be a nice ride.
Someday when I grow up I will probably lose interest in toys with wheels, but until then...