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Doctorot's '78 KZ1000 build 10 Jan 2022 23:43 #860390

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This summer i noticed i had quote a bit of lash in the kush on the rear wheel. at least 3/8" that i could rock easily back and forth, probably more like 1/2"+ under real pressure. I bought this repro kush rubber by PMC from Webike and the fit is perfect, zero slop. I always felt like i had to be very conscious of keeping the drive train loaded, hopefully this will help with that.
 
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Doctorot's '78 KZ1000 build 11 Jan 2022 09:04 #860402

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Thanks. Good that the aftermarket is working, OEM are drying up and getting expensive. I was lucky a couple years ago and replaced mine inadvertently in my ‘78 1K disc. I was chasing a low rpm surge, before I figured out it was air leak in the carb holders I was looking to the drive train. Replaced the Cush drive, adjusting chain, looking at backlash at the counter sprocket. 
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

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Doctorot's '78 KZ1000 build 11 Jan 2022 09:29 #860405

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DoctoRot post=860390I bought this repro kush rubber by PMC from Webike and the fit is perfect, zero slop. 


As Mikaw said, it's nice that reproductions are available.  The cush-drive in my Z1R still feels tight, but it hadn't occurred to me until now that it might have become really hard and stiff over the years, like all of the other rubber pieces, and might not actually be doing a great job a a shock damper any longer. 

How does the new replacement feel relative to the vintage part?
'78 Z1-R in blue , '78 Z1-R in black, '78 Z1-R in pieces
My dad's '74 Z1
'00 ZRX1100

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Doctorot's '78 KZ1000 build 11 Jan 2022 11:07 #860414

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Is there an easy test to measure play that would isolate it to the kush damper?
Back in the saddle and loving it! KZ1000A1

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Doctorot's '78 KZ1000 build 11 Jan 2022 12:39 #860419

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Hit the rear brake and try to move/whiggle the rear sproket by hand (in neutral). If the kush drive can move easily back and forth by hand, the rubber damper have to be replaced.
The following user(s) said Thank You: BCScott

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Doctorot's '78 KZ1000 build 11 Jan 2022 12:54 #860420

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DoctoRot post=860390I bought this repro kush rubber by PMC from Webike and the fit is perfect, zero slop. 


As Mikaw said, it's nice that reproductions are available.  The cush-drive in my Z1R still feels tight, but it hadn't occurred to me until now that it might have become really hard and stiff over the years, like all of the other rubber pieces, and might not actually be doing a great job a a shock damper any longer. 

How does the new replacement feel relative to the vintage part?

 
Better in every measurable way. PMC always makes high quality stuff. It was $105 shipped from japan the dampers for the Z1 and MKII are cheaper, came in about a week - I love WeBike.

japan.webike.net/products/22640411.html

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Last edit: by DoctoRot.

Doctorot's '78 KZ1000 build 19 Jul 2022 16:28 #870654

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Discovered a new oil patch on my local on ramp. Not too much damage, and most things can be easily fixed except for a scrape on the tail and some road rash on the swingarm. I rode it home. This is why you always gear up even for small errands, i didn't get a scratch. Time to make it better.

 
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Doctorot's '78 KZ1000 build 19 Jul 2022 16:54 #870664

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Ouch. I'm glad you came out of it unscathed. 
I run those same Oury grips on all my vintage bikes except the GPz. Love 'em. 
Jim
North GA
2016 Yamaha FJR1300ES
1982 GPz750 R1
1974 Kawasaki H1
1976 Kawasaki KZ400
1979 Yamaha XS650 cafe'
2001 KZ1000P
2001 Yamaha YZ426
1981 Honda XR200 stroked in an '89 CR125 chassis
1965 Mustang
1967 Triumph GT6
1976 Bronco
"If you didn't build it, it's not really yours"

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Doctorot's '78 KZ1000 build 19 Jul 2022 17:08 #870666

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Aww man bummer, good to here your intact. Good advice on the gear. 
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

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Doctorot's '78 KZ1000 build 19 Jul 2022 18:40 #870675

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Damn, that sucks but this shit happens to the best rider (me too). Time to think about some crash bars/pads?

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Doctorot's '78 KZ1000 build 19 Jul 2022 23:36 #870686

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Glad you are good and healthy after it , yep it’s the short runs that are the dodgy ones, in the summer I’m all bike, in and out of work and it’s a mine field out there. All will polish out and leave cool scars, especially that moriwaki points cover…
06 Gsf 1200 bandit, 08 Triumph tiger 1010
05 Yam xv1700 , 02 Hon shadow 1100
1975 Z1 (currently working on)
1977 Z1000 ( running and in storage)
1978 Z1000 (currently working on)
1978 Z1r "skinny tank" (currently working on)
1978 Z1r "fat tank (gathering parts)
1979 z1000st (currently working on)

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Doctorot's '78 KZ1000 build 19 Jul 2022 23:46 #870687

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Damn, that sucks but this shit happens to the best rider (me too). Time to think about some crash bars/pads?
 
I think i will at the very least make some axle sliders since i have a hollow axles. That would have prevented all the damage to the swingarm which is a big ol' bummer. The tubular crash bars/cages that i've seen on KZs are really unappealing to me on a custom like this. They look OK on a stockish bike. The sliders that Sanctuary/Bulldock use on their builds don't really seem like they would do much. Not sure what to do yet.

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