we lined up the BMX one day with a mates Mazda R100 13B turbo,
the BMX was infront of the Mazda for the first 40 metres, here's the car a couple of years later.
my brother and i also put an engine in another bike, a Victa 160 2 stroke into my Moosegoose,
we had a Sturmey Archer 3 speed hub on the back, we clocked ithe bike at 70kmph one day.
the rear hub couldnt really handle the power though, it would blow the gears in the hub, we had to replace it a couple of times
this is the style BMX we fitted it to, was a big BMX frame but with 20" wheels, made by Mongoose.
was a pity we did it to that bike, a few years later they were selling for heaps on ebay, pretty rare too
i think i have maybe 8 whipper snippers here atm, i might have to build up another bike, a 16" BMX maybe?