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TOPIC: Z2 750 crank (Bossie the Kaw)

Z2 750 crank (Bossie the Kaw) 21 Sep 2015 14:25 #691243

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Glad to see your thinking of going with a 903 crank......... the 750 crank is way cool but I'm thinkin you should get a hell of a price for it and the way your into HP (most of us on here are) ;) it sounds like the right choice..........

Also I picked up a new stock spring for the chain tensioner and it was quite a bit longer and stronger than the old one. .....was glad I did mine after seeing the difference.........valve, clutch springs etc etc all are wearing out over time.....just like me. :lol:
1978 KZ650 b-2
700cc Wiseco kit 10 to 1.
1980 KZ750 cam, ape springs, stock clutch/ Barnett springs.
Vance and Hines Header w/ comp baffle and Ape pods, Dyna S and green coils, copper wires.
29MM smooth bores W/ 17.5 pilots, 0-6s and 117.5 main
16/42 gearing X ring chain and alum rear JT sprocket....
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Z2 750 crank (Bossie the Kaw) 21 Sep 2015 14:29 #691244

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Peter, That's a good idea but I already spent $500, plus another $125 for pistons and I might as well get the use out of them. I'll just ride and enjoy it for the time being. :)
Steve
Z1b1000 1975 Z1b
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Last edit: by SWest.

Z2 750 crank (Bossie the Kaw) 21 Sep 2015 14:40 #691248

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I was going to move the shop. Talked to a guy with a wrecker. It was 12'X14' up on blocks so I could move it. Had I brought it close to the house, the Meth Heads wouldn't have gotten my cases and engine parts. They weren't worth much then, but now, CRAP. :angry:
The spare crank was wrapped in double black garbage bags and a spare swing arm they didn't see. Some small parts I need now and needed earlier. They all burned with the shop. :(
Steve
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Z2 750 crank (Bossie the Kaw) 21 Sep 2015 14:42 #691249

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Tyrell Corp wrote: the trouble is, these things are almost bullet proof.

...that is the problem, anyone want a good in service spec 550 /750 crank and rods - yous for a bottle of red. Kawasaki were too clever in their engineering , these ££££ forged/pressed cranks now you almost can't give away.

Customer complaint: Dear kawasaki, please make our cranks more crappy to give the small guys a chance of maiking some dough here 30 years later to fund our restoration projects :laugh: .


I'll bet they don't do it now. :whistle:
Steve
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Z2 750 crank (Bossie the Kaw) 22 Sep 2015 01:52 #691287

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swest wrote: That would be unreliable due to the new rings and only 200 miles on it. I'm checking my valve adjustments this morning. I will do the wire test. I have some heavy gauge wire I can use. I can measure at the side where the piston is flat and then measure the center of the dome if that would help.
Steve


Your right on that but before I started mine I wanted to build a little oil pressure and wanted to see it things were right anyway and I got 145 across the board cold and un started then 165 after 600 miles......Ron.
1978 KZ650 b-2
700cc Wiseco kit 10 to 1.
1980 KZ750 cam, ape springs, stock clutch/ Barnett springs.
Vance and Hines Header w/ comp baffle and Ape pods, Dyna S and green coils, copper wires.
29MM smooth bores W/ 17.5 pilots, 0-6s and 117.5 main
16/42 gearing X ring chain and alum rear JT sprocket....

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Last edit: by KZB2 650.

Z2 750 crank (Bossie the Kaw) 22 Sep 2015 04:22 #691307

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There's good and bad. The good is, it runs better that it did. It is a Z2 750 crank so I don't have to feel ashamed for touting it all these years. Would I admit it? Yes. :blush:
I seem to have a vary rare item that could be worth a lot of money I could put back into the bike, (big bore kit, etc.) and sell the pistons and barrels I have now at 1/2 the price, maybe. Or buy a run down Z1b and switch parts. B)
The bad, I am running on lower compression than normal. I know that now but didn't before I started this thread. (ignorance is bliss), I'll have to tear it down again (no hurry for that), I'll be able to buy a 903 crank (a good one) and do the gussets I didn't have time for this time around. Not that bad. :lol:
Meanwhile I'll be in the wind and loving every minute of it. :woohoo:
Steve
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Z2 750 crank (Bossie the Kaw) 22 Sep 2015 07:06 #691339

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Swest, did you ever measure the compression with a compression tester? Theory aside, I'm wondering how low you're actually running if the bike feels like it's running well, is easy to start, etc.
1997 KZ1000P (P16)
2001 KZ1000P (P20)

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Z2 750 crank (Bossie the Kaw) 22 Sep 2015 10:26 #691381

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I decided to do my valve adjustments again. When I put it together the other day I noticed one cam tower bolt was stripping out so I put in a Heli Coil at the same time. Two valves were too loose and I went down one size. They are all in the .003-4 range.












I tried to do a compression test last night. The gauge doesn't work for SHT. It was left in a tool box in the rain by my son years ago. I have another gauge I will try to adapt to the fitting. From what I could tell, I'm in the 120 range. Can't hold my thumb over it so it's runable but not where it should be.
Steve
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Z2 750 crank (Bossie the Kaw) 22 Sep 2015 10:35 #691386

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This isn't a very good pic but you can see a ring on the cam caused by too large a clearence. It was slapping the bucket. You can hear it when it's happening.


I corrected it the other day so the mark is wearing away.
Steve
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Z2 750 crank (Bossie the Kaw) 22 Sep 2015 11:16 #691398

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swest wrote: I tried to do a compression test last night. The gauge doesn't work for SHT. It was left in a tool box in the rain by my son years ago. I have another gauge I will try to adapt to the fitting. From what I could tell, I'm in the 120 range. Can't hold my thumb over it so it's runable but not where it should be.
Steve


120 isn't too bad. The thumb test doesn't really tell you anything, it could only be 50PSI and you still wouldn't be able to hold your thumb over it...
1997 KZ1000P (P16)
2001 KZ1000P (P20)

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Z2 750 crank (Bossie the Kaw) 22 Sep 2015 13:43 #691416

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It's not good ether. Oh well, another good excuse to buy more parts and time with the bike. B) Good thing I'm single. :woohoo:
Steve
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Z2 750 crank (Bossie the Kaw) 23 Sep 2015 03:34 #691483

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i bet it likes to rev :evil: !

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!

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Z2 750 crank (Bossie the Kaw) 23 Sep 2015 04:05 #691488

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Before I did this ,it wanted to bury the red line. I'd be coming up to a light at 55, it would turn yellow, I'd drop down two gears, bury the red line, power shift into second and clear the intersection before it turned red. I'd be listening for unusual noises after that. :whistle:
There is a intersection in Desperate Hot Springs with the normal red light cams and also a round bottom cam. I swear it is being controlled. I came up to it a 45, it went green,yellow,red. Just that quick. I dropped into first, grabbed a hand full and checked my mirror, the light was red. I didn't get a ticket in the mail so I must have made it. :dry:
Steve
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Z2 750 crank (Bossie the Kaw) 23 Sep 2015 05:21 #691494

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Well, I'm about to be on my way. I can tell already I'll need that 16 tooth counter shaft sprocket. 5000 RPM at 70 just don't cut it. With the extra power I should be at 3500 at 55 and 4000 at 70 with the 16. Not many light to lights out here. I'll check back in in a few hours. :whistle:
Steve
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Z2 750 crank (Bossie the Kaw) 23 Sep 2015 06:35 #691497

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Would it be feasible to skim 2.5mm off your block (without pressing the liners out to avoid distortion) and slot the cam gears to get your valves back on time? Maybe even tune for rpm power with some more valve overlap even to take advantage of the undersquare revvy motor?.

The 'unsed' part at TDC is where your compression pressure is highest, the bit at the top of the bore that isn't run in - possible problems going to the other crank now with the same rings?
1980 Gpz550 D1, 1981 GPz550 D1. 1982 GPz750R1. 1983 z1000R R2. all four aces

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Z2 750 crank (Bossie the Kaw) 23 Sep 2015 07:12 #691503

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Tyrell Corp wrote: Would it be feasible to skim 2.5mm off your block (without pressing the liners out to avoid distortion) and slot the cam gears to get your valves back on time? Maybe even tune for rpm power with some more valve overlap even to take advantage of the undersquare revvy motor?.

The 'unsed' part at TDC is where your compression pressure is highest, the bit at the top of the bore that isn't run in - possible problems going to the other crank now with the same rings?

That brings the camshafts closer to the crankshaft sprocket.
The number of links between the two cams and the crank sprocket would be the same but my poor pea brain can see this messing up the exhaust cam timing a bit... retarding geometry?
Maybe someone else can anwser that.
Bruce
1977 KZ1000A1
2016 Triumph T120 Bonneville
Far North East Metro Denver Colorado

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Z2 750 crank (Bossie the Kaw) 23 Sep 2015 10:17 #691532

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Greetings from Phelan. Started to lose a master link as I was over the hill. At the gas station I put on a spare I had. THIS IS A BRAND NEW CHAIN. Lots of dirt bags up here scoping me out while I was working on it. As I put on my riding gear, one guy walked up looking like he wanted to talk to me. I fired her up and rode away. :angry:
Tyrell, I won't be long until I get a 903 crank. I can get new rings at Z1E for $12 a set. I have one extra set anyway. I'm serious about selling the 750 crank. I appreciate you're advice and maybe it would work for someone else. I'd love to go with a 1200 kit but would be happy with a 1105. :whistle:
Bruce, I'm experiencing the same symptoms as you. It seem if I stay at a certain RPM on the FWY, I lose the roll on power. Maybe I'm babying it too much. I know it will lean out and I have 300 miles on it now. As soon as I get to 500, I'm going to bang it through the gears and explore the red line. :woohoo:
Steve
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Z2 750 crank (Bossie the Kaw) 23 Sep 2015 10:42 #691544

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Lucky you noticed the master link could a made for a bad day ....... I ran one for years but this time I had my local repair shop peen the master link on for me just in case...... was a pain removing the swing arm but not really that bad......1105 that gets me excited just thinking about it. :cheer:

Had a buddy snap his chain when we were kids on his new 160 Honda and it rapped up and cracked the bottom case..... we were 15 and it brought a tear to his eyes (can't blame him) ...... his dad helped him out and the bike shop replaced it for 160 bucks a dollar a cc. (1965 prices)
1978 KZ650 b-2
700cc Wiseco kit 10 to 1.
1980 KZ750 cam, ape springs, stock clutch/ Barnett springs.
Vance and Hines Header w/ comp baffle and Ape pods, Dyna S and green coils, copper wires.
29MM smooth bores W/ 17.5 pilots, 0-6s and 117.5 main
16/42 gearing X ring chain and alum rear JT sprocket....

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Z2 750 crank (Bossie the Kaw) 23 Sep 2015 10:56 #691549

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These bikes have a cage around the counter-shaft sprocket. I put the little cover back on after all these years. I'll bet that's what kept it together at speed. I noticed a clunking and knew right off what it was as I was stopping :pinch: . I had a chain roll out the back years ago. If it wrapes up in the rear wheel, it could be deadly. Like the boy scouts say, "be prepared." B)
Steve
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Z2 750 crank (Bossie the Kaw) 23 Sep 2015 11:02 #691551

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a lil safety wire wrapped around the masterlink will insure the clip goes "nowhere"!





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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