Hi Graham.
I'm useless with ratio's and stuff, way too complicated.
All I can say is I ran a 17 tooth pinion on the BJ worlds and it was fine. I ran it until it dumped, around 7-8 mins and the motor was hot, but not untouchable, nicely warm i'd say.
I used the guide that came with the Novak motor I think it said around 3 teeth lower than i'd run normally, so i'd just drop a tooth if your going from the 6.5 to the 4.5.
I might try gearing it up this weekend to calm the torque down, I know it won't dump and the track at Bury offers very little resistance, so I guess that's one of the reasons it all stayed quite cool.
It was awesome, if anything too fast down the straight, it scared me a bit !
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