Z2 750 crank (Bossie the Kaw)

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:

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

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.
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

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

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.

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.
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

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.

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

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

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...

It's not good ether. Oh well, another good excuse to buy more parts and time with the bike. Good thing I'm single. :woohoo:
Steve

i bet it likes to rev :evil: !

leon