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TOPIC: Kosman frame bracing kits for the Z1 KZ900 KZ1000

Kosman frame bracing kits for the Z1 KZ900 KZ1000 29 Oct 2015 10:58 #696434

  • Dr. Gamma
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I have been slowly putting my KZ1000 Superbike back together piece by piece. People been asking about frame bracing and where to put all the bracing needed to make the big KZ to handle. The frame picture here is what most people used in AMA Superbike racing from late 1977 to about 1981. All that thin plate gusseting around the steering stem is flat useless. Just remove all of it. Tubular bracing is the only answer to strengthening up the steering stem. Now if you add oversize motor mount bolts, and ream the frame and engine cases so that all the motor mount bolts are a interference fit or press fit. The motor becomes part of the frame. All other gusseting that is not shown is really not needed to strengthen up the frame.








1972 H2 750 Cafe Racer built in 1974.
1976 KH400 Production Road Racer.
1979 Kz1000 MK. II Old AMA/WERA Superbike.
1986 RG500G 2 stroke terror.
1986 GSXR750RG The one with the clutch that rattles!

Up in the hills near Prescott, Az.

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Kosman frame bracing kits for the Z1 KZ900 KZ1000 29 Oct 2015 10:58 #696435

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Sorry about all the duplicates, the library in Prescott Valley just got hit by a HUGE thunder shower, then everything locked up and then went blank. Then all the duplicates popped up.
1972 H2 750 Cafe Racer built in 1974.
1976 KH400 Production Road Racer.
1979 Kz1000 MK. II Old AMA/WERA Superbike.
1986 RG500G 2 stroke terror.
1986 GSXR750RG The one with the clutch that rattles!

Up in the hills near Prescott, Az.

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Last edit: by Dr. Gamma.

Kosman frame bracing kits for the Z1 KZ900 KZ1000 29 Oct 2015 11:09 #696437

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Do you want them deleted?
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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Kosman frame bracing kits for the Z1 KZ900 KZ1000 29 Oct 2015 11:12 #696438

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YES PLEASE!!! There should be a total of six photos with the listing. It is getting real scary here in Prescott Valley. The skies have opened up again big time !!!
1972 H2 750 Cafe Racer built in 1974.
1976 KH400 Production Road Racer.
1979 Kz1000 MK. II Old AMA/WERA Superbike.
1986 RG500G 2 stroke terror.
1986 GSXR750RG The one with the clutch that rattles!

Up in the hills near Prescott, Az.

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Kosman frame bracing kits for the Z1 KZ900 KZ1000 29 Oct 2015 11:29 #696439

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I live in the desert too. I have a large wash the goes corner to corner on my 5 acres. It can be a torrent in seconds. I'll delete your removed posts.
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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Kosman frame bracing kits for the Z1 KZ900 KZ1000 21 Apr 2016 19:09 #722277

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Hey DR Gamma,

Do you still offer this frame stiffening kit?

Thanks,

Steve
1982 Kawasaki Eddie Lawson S1 (1136cc race replica clone.)

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Kosman frame bracing kits for the Z1 KZ900 KZ1000 22 Apr 2016 07:15 #722331

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I may be wrong , but I dont believe he was offering to make kits for sale.
Dave
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Mr Turbo Race Kit, MTC 1075 Turbo pistons by PitStopPerformance , Falicon Ultra Lite Super Crank, APE everything. Les Holt @ PDM's Billet Goodies . Frame by Chuck Kurzawa @ Logghe Chassis . Deep sump 5qt oil pan. RIP Bill Hahn

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Kosman frame bracing kits for the Z1 KZ900 KZ1000 22 Apr 2016 07:52 #722344

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Oh thanks Dave,

I guess I just assumed they were for sale since it was in the vendor forum.
Looks like a good idea to stiffen up things though.

Steve
1982 Kawasaki Eddie Lawson S1 (1136cc race replica clone.)

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Kosman frame bracing kits for the Z1 KZ900 KZ1000 22 Apr 2016 09:05 #722360

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Last time i looked, PMC has a bracing kit listed in their catalogue. You could contact Z1E and ask if they can order it.
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

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Kosman frame bracing kits for the Z1 KZ900 KZ1000 22 Apr 2016 09:22 #722363

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My frame is an 81 GPZ1100 though. Not sure if it's in kit form.

I thought it would save on cutting all the pieces if I can find a kit.

Don't see anything on PMC's site though.
1982 Kawasaki Eddie Lawson S1 (1136cc race replica clone.)

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Kosman frame bracing kits for the Z1 KZ900 KZ1000 22 Apr 2016 10:06 #722369

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Coast Steve wrote: My frame is an 81 GPZ1100 though. Not sure if it's in kit form.

I thought it would save on cutting all the pieces if I can find a kit.

Don't see anything on PMC's site though.

Try giving 531blackbanshee a P.M., he used to make them
Pete
1980 LTD 1000..,1976 LTD 900, have the 1000&900 now. the rest are previous= 1978 KZ 650 B.., 1980 Yamaha XT 500..,1978 Yamaha DT 400.., 1977 Yamaha yz 80..,Honda trail ct 70.., Honda QA 50...5-1/2 hp brigs & straton CAT chopper mini bike...3-1/2 hp mini bike (WHEN GAS WAS ABOUT 45 CENTS A...

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Kosman frame bracing kits for the Z1 KZ900 KZ1000 26 Apr 2016 11:09 #723076

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After I get my 440 back together and caught up on shop and house projects, If someone provides the appropriate frame and/or, as well as their knowledge with the Z1, 9 and/or 1k, cause I havent got a clue other than the 900 has a front wheel I want :P Also help from such individual in measuring, marking, cutting and fitting, I wouldn't mind opening the shop doors on a weekend to bang some bars out for the community B) I'm no motorcycle expert by any means, but Ive been told that my mutant power is the ability to easily spot problems and fabricating problem solving?
Also, I'm not in any way trying to step on anyone's toes or gain customers, he'll chances are it may not even happen? (that is unless you wanted to turbocharge your car :P ) sooo yeah,
Cheap labor isn't skilled, skilled labor isn't cheap.
1980 KZ440a. I went green.
If you yourself are building an older bike and can see it through till you're riding it, that's proof you have patience.

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Kosman frame bracing kits for the Z1 KZ900 KZ1000 26 Apr 2016 12:36 #723093

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The '81/'82 KZ1000J, and the '81/'82 GPz1100 frames were designed after what Kawasaki learned in the '80 Superbike program. They are a real good frame in their standard form. Even the KZ1000S1 Superbike road racer that Kawasaki sold back in 1982 used the KZ1000J frame with just ONE extra frame brace!!!!! It was that good of a frame design even for their Superbike racer. !!!! There was even a couple of AMA Superbike racers that stuck the early model motor into a stock framed KZ1000J Superbike back in 1981, and they said it was better than their early model modified framed bikes. I got a couple of pictures of one of those bikes at Daytona somewhere!!!

I owned and raced a KZ1000Si back then, and it handled almost as good as the Superbike that I built back then. Now my Kz1000 that I built started with a Rob North/ Pierre DesRoche modified frame. Why don't you just get a nice swing arm, and a pair of Ohlins piggyback shocks with your GPz frame, and I think you will be impressed!!!!
1972 H2 750 Cafe Racer built in 1974.
1976 KH400 Production Road Racer.
1979 Kz1000 MK. II Old AMA/WERA Superbike.
1986 RG500G 2 stroke terror.
1986 GSXR750RG The one with the clutch that rattles!

Up in the hills near Prescott, Az.

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Kosman frame bracing kits for the Z1 KZ900 KZ1000 26 Apr 2016 14:40 #723117

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Well maybe it all stops right here then. (and thanks you guys for the tips).
So you recommend I don't need to modify it then.
Already have the swing arm DR G,

My goal is more power though cams or head work but on a decent handling frame.

This bike is still in transit to me so I don't know how it will handle and feel.

I did read lots about rubbery frames on the web though.
But that might just be with with sticky slicks and on the track.

I also really miss those 3 rd gear roll on powerlifts my old superbike did.
Hoping for that feeling again with this.
I also remember switching to roller bearings in the head tube on another bike and wow what a difference.
Not sure if mine has those or not.

I just want the bike to be as good as it can be....within reason. I know it's only steel tubing.
Would love to see your pics DR Gamma
1982 Kawasaki Eddie Lawson S1 (1136cc race replica clone.)
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Last edit: by Coast Steve.

Kosman frame bracing kits for the Z1 KZ900 KZ1000 02 May 2016 11:45 #724129

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Coast Steve wrote: Well maybe it all stops right here then. (and thanks you guys for the tips).
So you recommend I don't need to modify it then.
Already have the swing arm DR G,

My goal is more power though cams or head work but on a decent handling frame.

This bike is still in transit to me so I don't know how it will handle and feel.

I did read lots about rubbery frames on the web though.
But that might just be with with sticky slicks and on the track.

I also really miss those 3 rd gear roll on powerlifts my old superbike did.
Hoping for that feeling again with this.
I also remember switching to roller bearings in the head tube on another bike and wow what a difference.
Not sure if mine has those or not.

I just want the bike to be as good as it can be....within reason. I know it's only steel tubing.
Would love to see your pics DR Gamma


I LIKE!!!!
Your bike looks real nice in my book!!! What kind of throttle is that?? Looks like the old Yoshimura 1/4 turn I found for my old Superbike.

A few other things I also did to my S1 was replace those rubber mount pieces with the solid aluminum mounts that Sid Pogue made back in the early 80's. And I made up an oversize swing arm bolt. I could not believe the amount of clearance between the frame boss, and the stock swing arm bolt!!!! It had to be at least .030 between both. Just imagine what .030's of play there ends up at the rear axle!!!! That's one of the first things I noticed on all of the Muzzy built Kz1000's was a different swing arm bolt. Gee, I wonder why!!!

My machinist made me up a fixture that fit into the frame, and had a adjustable ream on the other end that opened up that side of the frame to the oversized bolt. Then I flipped it around and did the other side of frame. That way both sides of the frame were basically line-bored. Then I just honed the inner swing arm bushings to like a .001~.002" clearance to the oversized swing arm bolt. I have to tap my swing arm bolt into place. A lot of work, but it made a HUGE difference on my home built KZ1000 back then!!!
1972 H2 750 Cafe Racer built in 1974.
1976 KH400 Production Road Racer.
1979 Kz1000 MK. II Old AMA/WERA Superbike.
1986 RG500G 2 stroke terror.
1986 GSXR750RG The one with the clutch that rattles!

Up in the hills near Prescott, Az.

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Kosman frame bracing kits for the Z1 KZ900 KZ1000 02 May 2016 16:55 #724164

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I don't know about that throttle since I didn't build the bike. So can't answer that one sorry.

Hey, where's MY personal machinist? :)
1982 Kawasaki Eddie Lawson S1 (1136cc race replica clone.)

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Kosman frame bracing kits for the Z1 KZ900 KZ1000 06 May 2016 11:00 #724896

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Coast Steve wrote: I don't know about that throttle since I didn't build the bike. So can't answer that one sorry.

Hey, where's MY personal machinist? :)


All you have to do to get a personal machinist is spend an insane amount of cash with him, and make sure you bring him a bottle of his favorite liquor regardless of cost on his birthday, and Holidays!!!! When you need something made on Friday evening so you can go racing on Sunday, you will be glad you did that. I learned that from Cook Neilson years ago in his articles called Beyond Racer Road in Cycle magazine. Boy was he ever right on that one!!!!

1972 H2 750 Cafe Racer built in 1974.
1976 KH400 Production Road Racer.
1979 Kz1000 MK. II Old AMA/WERA Superbike.
1986 RG500G 2 stroke terror.
1986 GSXR750RG The one with the clutch that rattles!

Up in the hills near Prescott, Az.
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Kosman frame bracing kits for the Z1 KZ900 KZ1000 29 Jul 2016 12:11 #736619

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Lockhart Phillips for the 1/4 turn throttle

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Last edit: by barney.
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