I believe.....if you put a snowmobiel
engine in a M/C frame.....and run SCTA/BNI....you run for time only........I believe the rule is M/C
engines only.....at least is was that way in 1980 when I tryed to run my mobiel powered bike for record
HOWEVER, you can run the FIM BUB meet as a M/C.......FIM don't care what kind of engine you use