[parksie]

Ktm lc4 640

 

[parksie]

If you want to keep it Aprilia/Rotax Pegaso 650 motor fits quite nicely too.

 

[parksie]

Lazy big slug, better off with a 250
the 650s have the oil inside the frame as well

I know they were used in supermono, does the motor differ in tune between the Aprilia/BMW/husaberg it's used in?

Obvs better to keep it 2-stroke, just throwing some right hand sprocket options out there

 

[parksie]

mostly the head, the aprilia has 5 valves
no extra power though
I dont think they even make 50bhp
and you would need to fabricate somewhere to hold the engine oil

Imagine they're a heavier lump than a 257 as well