Thx for the reply, KC. I wanted to get your opinion on putting a 4-stroke behind the seat on an reinforced rear rack. I would place it in-frame but I doubt the 4-stroke will fit in the frame. This is the bike I want to do a bigger project on but first I figure I can try out the bike handling and what not with a 49cc 4-stroke. I see that you have some fat tire bike builds but the cruiser type; I really like the mountain bike look and feel. Please feel free to be brutal with your reply. I guess the advantage of the rear rack is that I can offset the motor as needed to compensate for the fat tire width.
Uggh, the Mongoose, what an unruly bike despite it's dual disc brakes and about the worst thing to try to motorize in my opinion.
The only thing I trusted to put in was was a low center of gravity electric shifting system as you can't even get a 2-stroke in without major mounting mods.
Eloquent, low center of gravity, a shifting system, but I still didn't like riding it even with near a 1KW of battery power.
I really can't even imagine what an Albatross it would be with a big 4-stroke above the back wheel as it was so cumbersome even with that electric that I pulled it off and it still sits as a kluge in my back yard with no motorizing and nobody likes to ride it as a regular bike either it's that bad.
Just my honest opinion bud, others may differ.
What I really liked in a really fat tire bike was the Sun Crusher, it was a joy to ride even with just dual V-brakes.
I put a beefed up 2-stroke shifter in this build, but it will take a 4-stroke.
Here is a comparison of the two.
Hope that helps as I really did enjoy riding the Sun Crusher but couldn't stand the Dolomite.