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TOPIC: Z2 750 crank (Bossie the Kaw)

Z2 750 crank (Bossie the Kaw) 11 Apr 2015 19:17 #667549

  • kawi810
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tyler let me explain .the Z2 is the same motor as a Z1 except the crank , pistons, and rods .thats how they built a 750 out of a 903.JAP MARKET ONLY some did make it to the US--but very rare.
original owner of a 1984 gpz 750
1985 turbo 750 stock, being restored.
1984 gpz 750 with 810 cc wiesco's megacycle cams(471-10) 34 mm flatslides v&h pipe ported head dyna ignition. bottom end, crank case from turbo 750 and sprockets.

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Z2 750 crank (Bossie the Kaw) 11 Apr 2015 19:24 #667550

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I also bought these items in 13.











I bought these after the wreck in 86.




More to come.
Steve
Z1b1000 1975 Z1b
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kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

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Z2 750 crank (Bossie the Kaw) 11 Apr 2015 19:38 #667553

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kawi810 wrote: tyler let me explain .the Z2 is the same motor as a Z1 except the crank , pistons, and rods .thats how they built a 750 out of a 903.JAP MARKET ONLY some did make it to the US--but very rare.


And I have the crank from one of them. B)
Steve
Z1b1000 1975 Z1b
Opinions expressed by me do not reflect those of the the staff or members
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

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Z2 750 crank (Bossie the Kaw) 11 Apr 2015 19:42 #667555

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thats why you have 750 lol
original owner of a 1984 gpz 750
1985 turbo 750 stock, being restored.
1984 gpz 750 with 810 cc wiesco's megacycle cams(471-10) 34 mm flatslides v&h pipe ported head dyna ignition. bottom end, crank case from turbo 750 and sprockets.

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Z2 750 crank (Bossie the Kaw) 11 Apr 2015 19:44 #667556

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Oh I forgot some. Four of them.


Steve
Z1b1000 1975 Z1b
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kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229
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Last edit: by SWest.

Z2 750 crank (Bossie the Kaw) 11 Apr 2015 19:46 #667557

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Bark bark bark. B)
Z1b1000 1975 Z1b
Opinions expressed by me do not reflect those of the the staff or members
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

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Z2 750 crank (Bossie the Kaw) 11 Apr 2015 20:07 #667562

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Tyler wrote: Just tryin to sort it out.

You have a z1b, and built the engine with a z2 crank rods and block, and put bigger pistons in it. Or am I missing something? Cases trans and head are from a 900 then?


I'll take some pics in the morning of the blocks. The sleeves came out of a 750 and put in a 903 block then bored to 1015. I ruined the bores, then bought a 1015 block. I'll post them then.
Steve
Z1b1000 1975 Z1b
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kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

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Z2 750 crank (Bossie the Kaw) 11 Apr 2015 20:30 #667567

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still got a Z2 crank = 750 so why tell everybody you have big bore bike. do you think all the membres of this forum are dumb ? steve stop the bull ***t
original owner of a 1984 gpz 750
1985 turbo 750 stock, being restored.
1984 gpz 750 with 810 cc wiesco's megacycle cams(471-10) 34 mm flatslides v&h pipe ported head dyna ignition. bottom end, crank case from turbo 750 and sprockets.

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Z2 750 crank (Bossie the Kaw) 11 Apr 2015 20:35 #667569

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You cut the block down? Shaved the block so the sleeves match the block hieght then?
If I knew what I was doing all the time life wouldn't be any fun.

'80 KZ650 E 700cc, dyna ignition and coils, frame up restoration, daily driver
'81 KZ1300 A3 full restoration, custom big bore pistons, 1400cc 6 cylinder super bike
"77 KZ650 B1 - Barn Find, work in progeress
"74 Yamaha DT 400 Enduro...

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Z2 750 crank (Bossie the Kaw) 11 Apr 2015 20:45 #667570

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No the sleeves dropped in. I didn't change anything. I had no idea the rods were shorter and I'm not sure they are that much shorter. Time will tell.
This IS a unusual build.
Steve
Z1b1000 1975 Z1b
Opinions expressed by me do not reflect those of the the staff or members
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

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Z2 750 crank (Bossie the Kaw) 11 Apr 2015 20:58 #667574

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kawi810 wrote: still got a Z2 crank = 750 so why tell everybody you have big bore bike. do you think all the membres of this forum are dumb ? steve stop the bull ***t


It appears you are saying that the Z2 crank makes the motor 750cc no matter what the bore. I'm sure you know that isn't the case, so what is it you are trying to communicate? The diameter of the cylinders = the bore, so why wouldn't a bike with large diameter cylinders (such as the block from an engine that started life with 1015cc) and a shorter stroke crank still be a big bore bike? I don't get it. Ed
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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Z2 750 crank (Bossie the Kaw) 11 Apr 2015 21:18 #667580

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kawi810 wrote: THE fuss here is the BS going on about a big bore motor whith a 750 crank are you not smart enough to figure it out ?

Kawi810,
I'm publicly asking you to dial it back. If you disagree, with swest, you may do so civilly. If you can't manage that, I can help.
KZCSI
www.KZ1300.com
Riders:
1968 BSA 441 Shooting Star, 1970 BSA 650 Lightning, 1974 W3, 1976 KZ900, 1979 KZ750 Twin, 1979 KZ750 Twin Trike, 1981 KZ1300, 1982 KZ1100 Spectre, 1987 Yamaha Trailway, 2000 Valkyrie, 2009 Yamaha Roadliner S. 1983 GL 1100
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1947 Indian Chief, 1985 ZN1300
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