TOPIC:

Not going to lie, yall scared the crap out of me! It's just a bad weld/not ground down.

Whew! Good to know. Sometimes pics can be misleading.

I wonder why the PO put in a Z1 motor? Any history on this bike?
BTW inane jabs at me are just that.
Steve

TexasKZ wrote: Dang it, Dave. You are just too fast.

Its the Turbo boost and Nitrous in my blood LOL

Glad its not a crack too

Dave

swest wrote: I wonder why the PO put in a Z1 motor? Any history on this bike?
BTW inane jabs at me are just that.
Steve

Me the the PO are in contact via Facebook, he is kin to my mother. He said he bought it new from House of Kawasaki here in Oklahoma, got it up to 180mph on the way home, said he never went over 80 after that. He didn't say much to why he had the motor swapped other that that the 903 is bored out and had a lot more get up. He told me the original motor should have been in the barn too, so I'm going to go look today. He said this 903 has less than 1k miles on it!

CoxUSMC wrote: . . . the 903 is bored out . . . .

Back in the day, a popular hop-up overbore was 1013 or 1015, which was considered fairly conservative, and which left the cylinder sleeves thick enough to avoid other issues.

Good Fortune!

CoxUSMC wrote:

swest wrote: I wonder why the PO put in a Z1 motor? Any history on this bike?
BTW inane jabs at me are just that.
Steve

Me the the PO are in contact via Facebook, he is kin to my mother. He said he bought it new from House of Kawasaki here in Oklahoma, got it up to 180mph on the way home, said he never went over 80 after that. He didn't say much to why he had the motor swapped other that that the 903 is bored out and had a lot more get up. He told me the original motor should have been in the barn too, so I'm going to go look today. He said this 903 has less than 1k miles on it!

The 903 has a lighter crank. I bored mine out to 1015 in 78. Did a rebore on Z2 750 barrels in 87. There's more. Lunched a piston in 13 and picked some low mile 1015 barrels. The tranny main fork is beefier than the 903 so I put that in when I put in a low mile tranny I backcut myself. I installed a KZ 1000 shift spring because it has one more wind than the 903. Went Lisla rollers and new cam chain in 13 also.
The KZ 1000 crank was made heavier to "reduce vibration." Very little difference between the two until the J motors came out.
Steve

If not already seen, here are some videos of the stock Z1's record-setting runs at Daytona Speedway:







Good Fortune!

Actually steve, take a look at a mkii crank (located in the 79-80 shaft mkii and ltd models) it has a beefier center section, and the porkchop style throws of the 900. that leaves 77-78 with the heavy cranks.

Put the carbs back on today and I guess one of my floats was still stuck, now there is a big puddle on gas under the bike and I broke the petcock lever in the process! I really don't want to have to check the valves so i guess I'll get a compression test while I'm looking for a new petcock and waiting on a new ignition...

The later 1000 cranks have a 16 tooth sprocket. Not interchangeable with the early models.
There's an article explaining this but I can't find it now. Here's something from another site.
www.kawasakiz1.com/Kawasaki-Z1B-Specifications.html
Steve

Welcome from East Tennessee!
From your avatar, I take it you are either in the USMC or a Veteran, either way, Thank You for your service!
You will find a lot of good information on here!
Ed