tuning a '91 gsf400 engine for track - what mods are best?

[bsodders]

Also trying to clarify what the components for the bb kits are?  Where are they supplied from?  Part #'s- and has anyone tried the gsx 550 crank yet?


Thanks

[Chris H]

Hi, GSXR gk73a is same crank as B4 but 76a is different. Bandit has helical primary gear and gk76a has a straight cut primary gear so you need the correct clutch also. Ive read but never seen that the 76a SP may have larger diameter main shells but without seeing the two im not sure, worth keeping in mind tho.
One of the old members (Bartjan i think) tried to stroke his B4 using gsx and early gsxr (longer stroke) but could never get any that fitted due to the differing primary gears.
Ive built a motor using TTS JE 440 pistons but Jay use to sell a kit based on OE pistons of some kind, probably 500/550 or 600, the JE use FZR600 59mm ring sets so start there.

[bsodders]

Thanks, as usual just trying to find what actually works and what's a headache.


B