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TOPIC: Z2 750 crank (Bossie the Kaw)

Z2 750 crank (Poser) 04 Apr 2015 18:14 #666572

  • SWest
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One of the members has accused me of not being truthful of my build. Being I will be going back into my engine in the near future, I will photo document it.


The sleeves were out of the 750 motor. The bore was still good when I replaced the cast pistons. They were damaged when I lunched the one piston. Notice there is no groove at the bottom of the sleeve as there would be if they were bored out 900 sleeves. Not much but it would still be there.


The billit pistons are shorter and lighter than the cast ones.


Here they are for compareson.


The one in the front is a 903 piston


The jugs are just under 2 mm. The bores are scored but the problem was they are pitted as well.


That's why I bought the 1015 block and pistons. Good thing too, I'm running them now. Light hone and back on the road.
I'll be adding more pics of the items I've "claimed" to have on the bike. When I get the block off, I will show the infamous 750 crank shaft. What the deck hight is now and after the 10.25 are installed.



When I adjust the valves again, I'll show the 1X cams.
To those of you that are tired of this, please skip my thread.
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.

Re:Poser 04 Apr 2015 18:22 #666575

  • OutsiderKZ900A4
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Nice work, Steve!
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Re:Poser 04 Apr 2015 19:17 #666585

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Show um steve!!!!

I've appreciated a lot of your info you've shared in your posts, and I respect the fact that you'll prove your statements to be truthful..


Chris
1980 KZ750H LTD-- pods-- vance & hines 4-1 --speedo/tach/blinker/switch deletes -- brat style
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Re:Poser 04 Apr 2015 19:27 #666588

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That makes me feel better.
Thanks
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
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Re:Poser 04 Apr 2015 20:00 #666591

  • z1kzonly
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WOW! years back! When I worked with Jim Mangus "Top Fuel Kawi 4 Cyl." a "Puppet" chassis from Buffalo, NY.
Jim has a Cylinder Head Business, He did a lot of heads for Harry Massey, Southern Ontario, for the 3/4 midget Guys. Before the GSXR engines. We used to get alot of the Z2 750 engines. That was the Max displacement 750cc's.
We used to de-tune 900's take out 1 piston. For these 3/4 midget racer's. But they always heated up and blew the middle out. The Z2 750's ruled for a while.
But, I recall a whole lot of parts that came our way for the Z2 750's. I can't believe I scrapped cranks and rods from them, thinking they were wimpy and small??????? Go figure? I wish ebay was around in the mid to late 1980's.
I remember the Japanese Z2 750, there was one at the local track for awhile. 77-78? A white painted one, Guy's name was Ed. He crashed it and got hurt. Never seen or heard from them after.
Livin in "CheektaVegas, NY
Still have a Kaw! 76 KZ900 Pro-Street.
Went thru 25 of these in 40 yrs.

And The Old Girl, Harley 75 FLH Electra Glide,
Old faithful! Points ign. Bendix Orig. carb.
Starts everytime!

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Re:Poser 04 Apr 2015 21:34 #666600

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Maybe you would know what markings would identify the Z2 crank. I plan to take pics of the crank throw and rod markings. I remember seeing a number stamped on the crank and cast markings on the rods.
Yeah, I threw away a lot of stuff too. This was the first and last Z2 I've ever seen. Not much known about it. I thought about weighing it but it didn't occur to me the rods would be shorter. The deck height looked good with the 10.25/1 pistons so I ran it. From 1987 to now, SURPRISE.
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.

Re:Poser 05 Apr 2015 00:35 #666604

  • KzChop82
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Steve,
You've been very helpful to me in my top end rebuild- along with a lot of other people on this site. Really appreciate your help!
Clinton, NJ
Custom chopper, 1982 KZ 1000 M2 CSR engine, K&N Pod Filters

PICTURES AND GOPRO VIDEOS!! :
www.dropbox.com/sh/jipz3l8nhzr4jge/AABbm...OC3sqlhCSLxH5Fa?dl=0
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Re:Poser 05 Apr 2015 05:32 #666612

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It's been a pleasure contributing. I've been learning a lot too. Just wish something like this existed when I was 18 and bumping my head and learning to work on my bike. I did have help. Barry at Handy Cycle and a Kawasaki dealer in Hollywood. B)
Steve
Z1b1000 1975 Z1b
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Re:Poser 11 Apr 2015 06:44 #667486

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Here's another page to add to my poser file.




It was like Xmas. Polished everything I could, just waiting for parts.
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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Re:Poser 11 Apr 2015 06:49 #667489

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I didn't get the springs and was talked out of the copper head gasket. Then I found I had to buy pistons. Another $500.
Steve

Z1b1000 1975 Z1b
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kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
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Re:Poser 11 Apr 2015 08:57 #667498

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the Z2 crank has stroke of 58 mm .it was used in the Z2 750 WITH A BORE OF 64 MM THAT MAKES IT A 746.4 CC MOTOR.if your bore is 70 mm that would make it 892.9 cc see original post on Z2 750 CRANK :P
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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Re:Poser 11 Apr 2015 13:52 #667519

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I knew you would. Bark, bark bark, go bight a mail man. :woohoo:
Steve
Z1b1000 1975 Z1b
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Last edit: by SWest.

Re:Poser 11 Apr 2015 15:28 #667525

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Put tape measure behind a rod at BDC and TDC. That would put this issue to bed.... er I think... whats this all about anyways?
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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Poser 11 Apr 2015 16:33 #667527

  • etbike3135
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hows that 4 valve piston working in your motor?
1973 Kawasaki Z1
18 years in dragbikes

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Poser 11 Apr 2015 16:59 #667528

  • 650ed
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etbike3135 wrote: hows that 4 valve piston working in your motor?


Good eye! I wonder if that piston came in the box because it definitely doesn't belong with the other 3. Ed
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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Poser 11 Apr 2015 18:14 #667536

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This guy has been trying to pick a fight with me since last year. (school yard bully). As I said on another thread that had nothing to do with a 750 crank, when I put in my new 10.25/1 piston I lunched almost two years ago, I will take pics of the deck height, rods and crank markings. He accused mt of lying about even having a Z2 crank. I do, he's a jerk, I will do this in time, not when he tries to badger me into it.
The piston in question is what Z1E sent to me. That held me up for another two weeks. If you'll notice, the numbers on the boxes all match. Someone switched a piston. Why is anyone's guess.
The thing I don't understand is, why the deck height was even with the 10.25/1 pistons and now with the stock pistons they were 2 mm lower? Clearly if the rod or rod/crank is 8 mm shorter, I would have noticed it and wouldn't have runable compression.
If things go as they should, I will be able to do a final tear down and put thing to bed in mid summer when it's too hot to ride anyway.
BTW, I have my eye on a 903 crank and some have been offered here. At that point it will be my option to put in a 903 crank or keep the 750 one. That remains to be seen.
As I said before, I can sell the Z2 crank on eBay for a lot more because it is so rare.
I've been collecting items for when the time comes.




I started this thread to photo document this build. 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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Re:Poser 11 Apr 2015 18:33 #667539

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swest wrote: I didn't get the springs and was talked out of the copper head gasket. Then I found I had to buy pistons. Another $500.
Steve


:silly: Velly intoelesting...

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Poser 11 Apr 2015 18:36 #667541

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the KEY word here is 750 CRANK .if anybody knows motors,
how would a 750 crank make a 903 motor .you think everybody is stupid ?all they have to do is google kawasaki Z2 750 and they will find the specs for a jap only market 750 based on the z1 w ith short stroke and small bore.but i know yours MAGICAL IT MAKES ANY KZ INTO WHAT EVER YOU SAY IT IS .SO YOU ARE THE REAL POSER.
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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Poser 11 Apr 2015 18:49 #667542

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kawi810 wrote: the KEY word here is 750 CRANK .if anybody knows motors,


how would a 750 crank make a 903 motor .you think everybody is stupid ?all they have to do is google kawasaki Z2 750 and they will find the specs for a jap only market 750 based on the z1 w ith short stroke and small bore.but i know yours MAGICAL IT MAKES ANY KZ INTO WHAT EVER YOU SAY IT IS .SO YOU ARE THE REAL POSER.
LOL



Ok so swest built an under square motor...

What is the big deal?

Seriously not yrying to fuel the fire, just curuois what the fuss us about.
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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Poser 11 Apr 2015 18:51 #667543

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Stop being jealous and buy a bigger bike. You are ignoring the fact that some Z2's did make it to the US as stated by another member. When the time comes, I will post pics. You a malcontent will just find something else to bark about. Enjoy. 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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