na i had a slack day at work and i though this post was interesting enough to put the effort in and i was interested in.
Often It really depends where i am when im typing, when im Busy at work or at home I cant be F'd, most times, as i figure most of you chaps skim this sort of stuff any way with a MEh ....attitude.
aS FAR AS THE ORIGIAL POST THOUGH GOES - depending on the track ( most of which in Au are short track, you could go for any number of 2 smokers or 4 strokes. Size means nothing, you need to be able to ride whatever you build/buy flat out and get it all to the ground, spinning it out in the corners wont help you, speedway guys will tell you, you never button off a slider or your in the wall or flipped on your face, so what ever you choose make sure you can ride it out of trouble, if you need to have a 4 banger, why not a XL 350 cheap as shit to get hold off and easy to hold flat nacker, keep looking for somthing you can get parts for, reliable, you can fix yourself, you understand, you like and above all you can confidently ride at 110%, when you see it buy it and enjoy it, if you ever out grow it then move up if you feel you need to, but like most of us old guys youll probally end up in a few years with a 250, then down to a 125cc, because you can still get the exsileration of ringing there little necks flat out neck without wetting your pants
just ask the Zooki boys, they swear buy little bikes for fun value.
I think you need to lose the bold typing though Firko :O)