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TOPIC: Z2 750 crank (Bossie the Kaw)

Z2 750 crank (Bossie the Kaw) 14 Mar 2019 10:22 #800336

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ROADSTAR wrote: Wow! Great build/read.

Just discovered this thread 2 days ago while I was pipe dreaming. I'm from the Philippines and currently own a 1975 Kawasaki 750RS ZII/Z2. Mine had a funny story actually. It was posted in one of the local motorcycle groups simply as "Kawasaki 900". Side covers had the 900 emblem as well, and papers simply had it listed as "Kawasaki 900".

Paid the seller up front and took the bike home for cleaning. However..... upon brushing off the engine.... it says "746cc". Worse, the wiring diagram/tool pan in the tail is in Japanese and actually says Z2. Not that I'm complaining, just a fun/interesting story. Bike's been with the family for over 30 years... original owner who passed away might be rolling in his grave right now.. all his life he probably has been showing it off as a "Kawasaki 900" when in fact it's not a Z1, but a Z2! lol

Anyway, was pipedreaming of a possible 76x58mm high revving Z2.. couldn't find results when searching in Japanese too - luckily, I stumbled upon your build. Sad you ditched the Z2 crank.... anyway, bike sounds good and seems real fast!!! how much more for an 1105cc! (I know someone locally who owns a Z1R with an 1105cc Wiseco kit, Mikuni RS36 carbs,as well as a real deal Kerker sidewinder exhaust installed.)

Good job with the Z!!!!! Hope I come up with the funds I need to either rebuild the bike as a 746, or actually realize my 76x58mm high rpm screamer pipe dream, or just get the 1105cc engine. Need to work harder it is!

Thank you for the great read, Steve!


PS

attached pictures of my bike before bringing it home


Those look like VM 26 carbs. I'd like to see a better pic of the stator cover too. Automotive shocks? The crash bars look beefy. B)
Steve
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Z2 750 crank (Bossie the Kaw) 14 Mar 2019 12:44 #800339

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I think you're right on the carbs. VM26SS. The original carbs were VM26SC with the same flat tops and the Z1's. I prefer the SS carbs because they are simpler to set up and maintain. But for originality I have to use the SC carbs.
I ride Z1's. I have a couple of '75's, plus an '80 KZ1000LTD. My lovely Sweetums rides a 1981 KZ550.

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Z2 750 crank (Bossie the Kaw) 14 Mar 2019 13:11 #800341

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I didn't know the carbs were smaller. The valves, cams and other parts were the same as the Z1. The bores were thicker due to the smaller displacement. I saw a set at Sam's cycle. I'll ask about them when I pick up the Z1 front end he has there. Our new member's user name is ROADSTAR but the bike was really called Roadster.
At the time I didn't now what I had. I would have taken better care of it.
Steve
www.freewebs.com/750rs/z2.htm
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Z2 750 crank (Bossie the Kaw) 14 Mar 2019 14:49 #800352

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Early Z2 carbs had the big drain nut on the bottom. They switched to the slotted drain screw on the side (Similar to late Z1A & Z1B) during the first year.

Both models had the same cylinders but Z1 was 66 mm bore and Z2 was 64 mm. Early Z2 cylinders were like the early Z1's....no O ring groove on the top. They probably changed both designs at the same time. Does yours have the groove?
I ride Z1's. I have a couple of '75's, plus an '80 KZ1000LTD. My lovely Sweetums rides a 1981 KZ550.

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Z2 750 crank (Bossie the Kaw) 14 Mar 2019 15:12 #800355

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I used only the liners. I'll look for the large drain nut on the carbs.
Steve
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Z2 750 crank (Bossie the Kaw) 15 Mar 2019 06:47 #800374

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When I rode without a windshield my genuine Harley Davidson jacket (Made in CHINA in 87) would be painted yellow with these buggers. :lol: At least I can ride. B)
Steve
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Z2 750 crank (Bossie the Kaw) 18 Mar 2019 04:17 #800550

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SWest wrote:

ROADSTAR wrote: Wow! Great build/read.

Just discovered this thread 2 days ago while I was pipe dreaming. I'm from the Philippines and currently own a 1975 Kawasaki 750RS ZII/Z2. Mine had a funny story actually. It was posted in one of the local motorcycle groups simply as "Kawasaki 900". Side covers had the 900 emblem as well, and papers simply had it listed as "Kawasaki 900".

Paid the seller up front and took the bike home for cleaning. However..... upon brushing off the engine.... it says "746cc". Worse, the wiring diagram/tool pan in the tail is in Japanese and actually says Z2. Not that I'm complaining, just a fun/interesting story. Bike's been with the family for over 30 years... original owner who passed away might be rolling in his grave right now.. all his life he probably has been showing it off as a "Kawasaki 900" when in fact it's not a Z1, but a Z2! lol

Anyway, was pipedreaming of a possible 76x58mm high revving Z2.. couldn't find results when searching in Japanese too - luckily, I stumbled upon your build. Sad you ditched the Z2 crank.... anyway, bike sounds good and seems real fast!!! how much more for an 1105cc! (I know someone locally who owns a Z1R with an 1105cc Wiseco kit, Mikuni RS36 carbs,as well as a real deal Kerker sidewinder exhaust installed.)

Good job with the Z!!!!! Hope I come up with the funds I need to either rebuild the bike as a 746, or actually realize my 76x58mm high rpm screamer pipe dream, or just get the 1105cc engine. Need to work harder it is!

Thank you for the great read, Steve!


PS

attached pictures of my bike before bringing it home


Those look like VM 26 carbs. I'd like to see a better pic of the stator cover too. Automotive shocks? The crash bars look beefy. B)
Steve


yes those are VM26 carbs. Former owner was a member of an anti crime group lead by residents of their area, hence the police'd look. Not sure too where the shocks are from, but of course, not stock... resembles shocks of earlier European bikes..
1985 Kawasaki  Ninja GPZ900R A2 「997cc」
1975 Kawasaki 750RS ZII 「746cc」

POWERED BY:
【川崎重工業】

夜露死苦!

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Z2 750 crank (Bossie the Kaw) 18 Mar 2019 08:24 #800573

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Well this didn't work. Got a new torch and will try it again.
Steve
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Z2 750 crank (Bossie the Kaw) 22 Mar 2019 21:57 #800876

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Tried again.
Steve
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Z2 750 crank (Bossie the Kaw) 28 Mar 2019 06:57 #801167

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Well, we'll see how long this one lasts. :dry:
Steve
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Z2 750 crank (Bossie the Kaw) 30 Mar 2019 14:55 #801301

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Time for a new cam. :(
Steve
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Z2 750 crank (Bossie the Kaw) 31 Mar 2019 11:01 #801336

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It just needs to work till I get a new one.
Steve
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Z2 750 crank (Bossie the Kaw) 03 Apr 2019 07:25 #801439

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Didn't need to check the stator. I'll do it when I clean up the wiring.
Steve
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Z2 750 crank (Bossie the Kaw) 12 Apr 2019 17:37 #802006

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Now that it's getting hot I switched the windshields.
Steve
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Z2 750 crank (Bossie the Kaw) 13 Apr 2019 18:47 #802062

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Noticeable difference on exceleration. :woohoo:
Steve
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Z2 750 crank (Bossie the Kaw) 15 Apr 2019 08:28 #802172

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Had to retorque the head again.
Steve
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Z2 750 crank (Bossie the Kaw) 17 Apr 2019 07:22 #802278

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It might be something stupid but I'll get ready with the rotor just in case.
Steve
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Z2 750 crank (Bossie the Kaw) 18 Apr 2019 07:01 #802336

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Looks like it is the rotor. Time to pull the cover. :dry:
Steve
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Z2 750 crank (Bossie the Kaw) 19 Apr 2019 05:46 #802399

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That was it. Back to her old self again. B)
Steve
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Z2 750 crank (Bossie the Kaw) 20 Apr 2019 11:54 #802478

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Noise before and after.
Steve
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