well, with the "fuel in the engine" business, from what a guy thats been karting for 30 years told me, that problem occurs in transport, so my karts fuel injector/ pump or whatever it is. can be unhooked from he engine and just put on and extra nut on the steering wheel. Also, tkms, from what i saw, where less stable than the rotax's, and IMO, unstable and slidy= huge fun. also. whats with make them scared by ramming them repeatedly to win, now, i may be no expert, but, i think that ramming is a waste, and that you can prove your skills much better by being plain quicker under braking and in the corners etc...
and finally, if someone was ramming me just to get me scared of them, all i would end up doing is thinking... "wow, that guys a massive prick, maybe he will crash, that'll give me a laugh"
thanks for all of the usefull feedback.
oscar.