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TOPIC: Z2 750 crank (Bossie the Kaw)

Z2 750 crank (Bossie the Kaw) 11 Apr 2015 18:56 #667544

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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 ?
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 19:04 #667545

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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?
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 19:08 #667546

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read my post on cc.s with a 58 mm crank
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 19:16 #667548

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www.thumpertalk.com/topic/801000-1975-ka...0-restoration/page-4

Ok alright got it now... alrighty then carry on...
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 19:17 #667549

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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
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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Last edit: by SWest.

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
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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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
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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 20:07 #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
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 20:30 #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
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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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Z2 750 crank (Bossie the Kaw) 11 Apr 2015 21:31 #667582

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swest wrote: 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


Yeah, so how did it work out. From the outside something doesn't add up. But it apparently works, will be watching.

Also these forum is full of type A personalities... and shit hits the fan every now and then. Dont take it personally.
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...
The following user(s) said Thank You: SWest

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Last edit: by Tyler.

Z2 750 crank (Bossie the Kaw) 11 Apr 2015 21:41 #667583

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Thanks Ed. I had no idea the Z2 crank had a shorter stroke in 87. I knew it was lighter and I had a friend with a CB 750 bored out to 1015 and that bike was quick. I've talked about it here. When I found the Z2 engine, it was complete. The head had broken fins but the valves were like new so I used them, at least I think I did. That was a long time ago. In 78, I had it bored out to 1015 but the bores were slightly out of line. After the wreck I had Clupper racing bore the 750 sleeves to 1015 and used my cast pistons. That's when I had the crank welded by V/H and ran it that way until 98. It sat for 15 years until 13 when I started to get on the road again. The compression land on one piston was deformed so I had to buy new Billet pistons. I screwed up and ruined one of my new pistons. I thought I had only scored the bores, so I won a 1015 set up on eBay. turns out I ruined another piston. I'm now running stock 1015 pistons in the 1015 block. I'm semi retired so money isn't flowing like it did before. It's all out of pocket. I'll be dammed if I'll tear this thing down just to show some horses pittute what I have. With a 903 crank, this bike would walk away from him. There's no reason to "brag" about having a 750 crank if it wasn't true. It is just so. B)
Steve
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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 21:56 #667586

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If I had known about this site, I would have photo documented my build in 13. I did take some pics but I was excited about getting Bossie back on the road and didn't take more. This time I have the opportunity and will. My apologies to the members that have to see this discourse. I've done my best to refrain from calling his bike a POS like he did mine only as to not insult other riders of the same size. This is not about me or him. It's about the bikes and what we do with them.
Steve

Attachment Bossie001.jpg not found

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Z2 750 crank (Bossie the Kaw) 12 Apr 2015 05:39 #667607

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Here's a link that show the specs, including bore and stroke, for the Z2. It shows the Z2 stroke as 58mm. On that same site the stroke of the Z1, KZ1000, etc. is shown as 66mm. Ed

www.motorcyclespecs.co.za/model/kawasaki...ki_z2_750rs%2073.htm
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