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TOPIC: Z2 750 crank (Bossie the Kaw)

Z2 750 crank (Bossie the Kaw) 12 Apr 2015 19:45 #667732

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Patton wrote: Per Dave Marsden:

THE Z2 WAS IDENTICAL TO THE LARGER BIKE IN DESIGN EXCEPT FOR THE DISPLACEMENT OF JUST 746 CC AND SMALLER 26MM CARBS.
IT WAS ONLY OFFERED IN THE BROWN AND ORANGE COLOUR OPTION FOR THAT YEAR.
ENGINEER INAMURA DECIDED THAT SIMPLY REDUCING THE BORE SIZE OF THE Z1 WAS NOT GOOD ENOUGH. INSTEAD KAWASAKI CHANGED THE BORE AND THE STROKE TO 64MM X 58MM. THIS CHANGE REQUIRED A DIFFERENT CRANKSHAFT, CYLINDERS, PISTONS, PINS AND RINGS. THE REST OF THE MOTOR REMAINED THE SAME.
....


Dave Marsden also said:

"I HAVE LISTED BELOW THE MAIN PARTS THAT WERE DIFFERENT FROM THE 1973-1975 Z1 RANGE OF MODELS:

CYLINDER BARRELS: 11006-014 (BLACK)
PISTONS: 13001-063 STD
PISTONS: 13027-061 1.00MM OVERSIZE
PISTONS: 13029-065 0.5MM OVERSIZE
RING SET: 13008-048 STD
RING SET: 13024-051 1.00MM OVERSIZE
RING SET: 13025-050 0.5MM OVERSIZE
PISTON PIN: 13002-026
CRANKSHAFT ASSY: 13031-044
CARBURETTOR ASSY: 16001-202 26MM MIKUNI
REAR SPROCKET: 42041-132 42 TEETH
DRIVE CHAIN: 92057-025 96 LINKS
REAR SHOCK ABSORBER: 45014-089 (1973 MODEL WITH ORANGE REFLECTORS)
REAR SHOCK ABSORBER: 45014-083 (1974/75 MODELS WITH RED REFLECTORS)
EMBLEM: 56018-153 LH PANEL
EMBLEM: 56018-154 RH PANEL
SPEEDOMETER: 25001-073 KPH
SPEED WARNING LIGHT: 23016-014
SWITCH (SPEED): 25025-003
SWITCH BRACKET: 32060-012

PARTS BOOK: 99997-103-04
. . .

INTEREST IN THIS RARE MODEL IS HIGH LEADING TO A SECTION OF THE CLASSIC KAWASAKI OWNERS CLUB BEING DEVOTED TO IT. THEY EVEN HAVE THEIR OWN RESIDENT Z2 EXPERT, JOHN BROOKES."

The above was published in 1998.

Good Fortune! :)
1973 Z1
KZ900 LTD

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Z2 750 crank (Bossie the Kaw) 12 Apr 2015 21:29 #667739

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What's the name of the site?

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) 13 Apr 2015 01:15 #667752

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Last edit: by davido.

Z2 750 crank (Bossie the Kaw) 13 Apr 2015 05:59 #667764

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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
kzrider.com/forum/2-engine/597654-poser?start=240#704229

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Z2 750 crank (Bossie the Kaw) 13 Apr 2015 07:14 #667773

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Nothing useful there. Of course the part numbers are different. The cam chain is the same as the Z1, the wrist pins are both 17 mm, The sleeve OD is the same. What I need to know is the Marking codes on the crank and rods. I will need them anyway if I decide to sell the crank.
Steve
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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) 13 Apr 2015 10:49 #667786

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An old friend of mine's Dad has a beautiful, (original) 1967 SS/RS Camaro that he bought brand new...He gets absolutely FURIOUS when some "know it all" at a car show tries to tell him what he's got.... under the hood or anywhere else on the car...the "takeaway" from this (for me) is that IT IS HIS VEHICLE, HE OUGHTTA KNOW WTF HE HAS...Cheese on rice, let this one GO already! LOL!
1978 KZ650 B2
Former rides...1976 CB360T, 1985 Shadow 700, 1985 GPZ750Turbo
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Z2 750 crank (Bossie the Kaw) 13 Apr 2015 11:50 #667791

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Hey Grumpy, haven't talked to you in a while. I'm taking the opportunity to document my build. I didn't get all the pics I should have. The crank is one of them. I was actually done a favor. It may be the 750 crank is a waste and I'm loosing ponies for it. I didn't realize just how valuable it is. I'm looking at it as a experiment. 903 cranks are easy to get. I had one but one of these low lives cost me it by burning down my shop.
"When it rains lemons, make lemonade. :woohoo:
Steve
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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) 14 Apr 2015 06:23 #667884

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no dog in this fight .
but here is a cc calculator
www.everything2stroke.com/content/36-Eng...placement-Calculator

wiseco list a 70 mm bore as standard for 1015cc's
and we have established z2's have a 58 mm stroke
4 cylinders
which gives us 893 cc's

rod length doesn't figure in to an engines size.
a formula using bore and stroke determines engine size.




hth,
leon
skiatook,oklahoma 1980 z1r,1978 kz 1000 z1r x 3,
1976 kz 900 x 3
i make what i can,and save the rest!

billybiltit.blogspot.com/

www.kzrider.com/forum/5-chassis/325862-triple-tree-custom-work

kzrider.com/forum/5-chassis/294594-frame-bracing?limitstart=0

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Last edit: by 531blackbanshee.

Z2 750 crank (Bossie the Kaw) 14 Apr 2015 06:24 #667885

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swest wrote: What I need to know is the Marking codes on the crank and rods. I will need them anyway if I decide to sell the crank.
Steve


Ask John Brookes (This email address is being protected from spambots. You need JavaScript enabled to view it.). If anyone knows, he will. Here's his Z2 site.
www.freewebs.com/750rs/
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Z2 750 crank (Bossie the Kaw) 14 Apr 2015 06:48 #667888

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Being the stock 1015 pistons are only 2 mm lower on the deck height and the 10.25/1 were even, I suspect the crank throws are different and the wrist pins are as well. There's only one way to find out for sure. I found a stock 903 piston and will compare it to the 10.25's but that won't tell us anything about the 750's. I'm going to send john a e-mail to see what he can provide.
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) 14 Apr 2015 06:53 #667889

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531blackbanshee wrote: no dog in this fight .
but here is a cc calculator
www.everything2stroke.com/content/36-Eng...placement-Calculator

wiseco list a 70 mm bore as standard for 1015cc's
and we have established z2's have a 58 mm stroke
4 cylinders
which gives us 893 cc's

rod length doesn't figure in to an engines size.
a formula using bore and stroke determines engine size.

hth,
leon


Leon, yes I used a bore of 69.4 mm which I got from www.motorcyclespecs.co.za when calculating the cylinder volume; (pi)*(3.47)sq*(5.8) then times 4 (four cylinders) = 877.60 cc . That is how I ended up with the 877.60 cc. If would have used a 70 mm bore the formula comes up with 893 cc. For a K1000, using a 70mm bore with a 66mm stroke the formula comes up with 1015. So not sure why that website states 69.4 mm for the bore on a KZ1000.

Leaving that aside, yes the throw of the crank is what is going to determine the stroke (height of the cylinder). My question is though, given the stroke is shorter, does that mean longer rods would need to be used in order to get the compression back? Are the 750's rods longer than the 900 rods in order to compensate for the 8 mm difference in throw? Thereby achieving the same deck height? Just curious on how Kawasaki did it.
Current project 76 KZ900 (This was a Vetter model)
76 KZ900
81 XJ550H SECA (Current Project)
82 XJ550R SECA
Past:
86 FJ1200
74 Z1900
72 CB450

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Last edit: by KZJOE900.

Z2 750 crank (Bossie the Kaw) 14 Apr 2015 07:13 #667893

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can't speak to z2 rod length or piston pin height.

here is the formula i have used for years to figure cc's

bore x bore x 3.14 x stroke = ____
divided X 4000 = cc's for one cylinder
so then you multiply that times the # of cylinders

hth,

leon
skiatook,oklahoma 1980 z1r,1978 kz 1000 z1r x 3,
1976 kz 900 x 3
i make what i can,and save the rest!

billybiltit.blogspot.com/

www.kzrider.com/forum/5-chassis/325862-triple-tree-custom-work

kzrider.com/forum/5-chassis/294594-frame-bracing?limitstart=0

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Last edit: by 531blackbanshee.

Z2 750 crank (Bossie the Kaw) 14 Apr 2015 07:46 #667895

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I just sent a e-mail to This email address is being protected from spambots. You need JavaScript enabled to view it.. It came back. I'll try again using the web site too.
I asked about the crank, rods and wrist pin position. I invited he visit this site and provide any info he has. Maybe I typed it wrong and will keep trying.
In any event, it appears I detuned my motor by using this crank. If this is true, then I will have to get a 903 crank to get back to where I started. That just means there will be a Z2 crank for sale at some point. Meanwhile the bike runs like a scalded cat and if I get my new piston, it will even be better. Like I said, no hurry. :whistle:
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) 14 Apr 2015 07:57 #667897

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I just tried This email address is being protected from spambots. You need JavaScript enabled to view it. still sent back. Got work to do, I'll try again later.
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) 14 Apr 2015 08:26 #667899

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You're missing the "." between z2 and john This email address is being protected from spambots. You need JavaScript enabled to view it.

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Z2 750 crank (Bossie the Kaw) 14 Apr 2015 13:18 #667927

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OK,I'll try it again. I'm at my daughter's place 130 miles away. Just went for a ride. About half way there, the bike started cutting out. I stopped but couldn't find any loose wires, I didn't pull the tank off. Limped up the hill, it getting power then back to two cylinders again and again. Got here and chilling. I have a spare set of coils on the bike. The ones I'm using are late model KZ 1000, 3 OHM. I tried to find a resister at Radio Shack but they don't have large enough or too large. I may have fried them. I'll switch coils in the morning if I don't find a bad connection. It's embarrassing when the bike acts like this and when I stop, the vultures are watching.
Steve
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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) 14 Apr 2015 17:16 #667948

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Just tried to e-mail z2 John. This time I sent using the . between z2 and john and .com. I also CC'd z2.john.....co.uk. Dot com came back, the CC .co didn't. Maybe I'll get something back. :unsure:
Steve
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kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
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Z2 750 crank (Bossie the Kaw) 15 Apr 2015 05:52 #668010

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double check the ground wire.
i had mine crack and break where it bolted to the engine and caused it to miss and drop in and out.

leon
skiatook,oklahoma 1980 z1r,1978 kz 1000 z1r x 3,
1976 kz 900 x 3
i make what i can,and save the rest!

billybiltit.blogspot.com/

www.kzrider.com/forum/5-chassis/325862-triple-tree-custom-work

kzrider.com/forum/5-chassis/294594-frame-bracing?limitstart=0

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Z2 750 crank (Bossie the Kaw) 15 Apr 2015 06:23 #668012

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Thanks, I'll try that. I haven't checked my plugs until yesterday on the road. They were dry and PURPLE? Must be the gas the Lib's force us to use. I checked the chart, no good gas for hundreds of miles around.
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) 15 Apr 2015 19:43 #668134

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I just got this from John at Z2.




I have a 903 piston. One more piece to the puzzle.
Steve
Z1b1000 1975 Z1b
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kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
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