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I hope someone answers these questions as I’m already a ways into my Lazer ZX rebuild, so here goes. 1) on the gearbox there is supposed to be a limiter nut with a 3mm set screw. The set screw I’m guessing is to stop the nut from coming loose, and to keep the clearance gap. I’ve lost the nut so what...

About the only things I can think of to upgrade a zx-rr would be some gpm alloy parts, like shock towers, suspension block pivots. Cross might also have had some alloy parts for lazer or the touring cars. ZX-RR was such high spec already that im not sure any aftermarket parts would be much of an up...