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i got a 1980 kz750 cylinder block for my project.
i was just comparing to stock 77 650b-1 block and seen that two of the inner bolt size are different
heres a pic of what i mean! they run even (parallel) with cam chain.
i assume this is just something i overlooked in my archive findings. what size/pitch do i need for this?
any help with be greatful!!

Post edited by: steveo_4192003, at: 2007/01/16 22:20

i don't mean to be a smarta$$ but, any parts store sells those little thread guages for about $3.00. From Snap On tools they are about $10.00. They always come in any tapp and die set also. Have any friends with a tapp & die set?
GOOD LUCK !

I think its 6mm to 8mm, but Im not sure, reborn650 should know

77KZ650 wrote:

I think its 6mm to 8mm, but Im not sure, reborn650 should know

I used the '77 Kz 650 head on the '80 Kz 750/4 block. The 2 bolt hole openings on the cylinders you indicated in your drawing are 8 mm for the Kz 750/4 and 6 mm on the Kz650. I simply drilled out the bolt hole opening on the 650 head to handle the larger 8 mm bolts for the 750 cylindes. Piece of cake.

If you have any other questions post 'em here and we can try to hlp out.

Cheers-Colin Firth-Ontario Canada.

1977Kz650 Custom. Bought new by brother, only 14,000 miles on bike. Frame-up restoration in 2004. First rebuild was 700 Wiseco. Recent upgrades include 810 big-bore, Wired-George Mikuni 29 smoothbores. 650 head ported, polished, milled. Kz750 cams, Gpz750 intake valves and springs. Dyna coils and electronic ignition. Velocity stacks and MAC pipe. 13 tooth front sprocket, 130 rear tire, Bridgestone Spitfires, stainless brake lines, Barnett Clutch, Superbike bars, sculpted seat, Moondust Silver with airbrushed striping to match factory paint job. Miss January on 2007 Kzrider.com calendar.

thats what i was going to do but didnt know if it was safe to do. i will drill it out and fit new 8mm bolts

have a good one! steve