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Replacement CV diaphragms
- slmjim+Z1BEBE
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31 Oct 2023 07:58 #891147
by slmjim+Z1BEBE
A biker looks at your engine and chrome.
A Rider looks at your odometer and tags.
1973 ('72 builds) Z1 x2
1974 Z1-A x2
1975 Z1-B x2
1993 CB 750 Nighthawk x2
2009 ST1300A
www.kawasaki-z-classik.com
An enthusiast's forum focused exclusively
on all things Z1, Z2 and KZ900.
Replacement CV diaphragms was created by slmjim+Z1BEBE
Has anyone used replacement diaphragms from here?
www.carburetordiaphragms.com/
Were they acceptable?
Good Ridin'
slmjim & Z1BEBE
www.carburetordiaphragms.com/
Were they acceptable?
Good Ridin'
slmjim & Z1BEBE
A biker looks at your engine and chrome.
A Rider looks at your odometer and tags.
1973 ('72 builds) Z1 x2
1974 Z1-A x2
1975 Z1-B x2
1993 CB 750 Nighthawk x2
2009 ST1300A
www.kawasaki-z-classik.com
An enthusiast's forum focused exclusively
on all things Z1, Z2 and KZ900.
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- Cra-z1
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31 Oct 2023 08:43 #891148
by Cra-z1
Replied by Cra-z1 on topic Replacement CV diaphragms
I have use diaphragms from JBM several times. These are a tight fit in the groove of the slide after you remove the plastic retainers.
jbmindustries.com/Dimensions.html
jbmindustries.com/Dimensions.html
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- Nessism
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31 Oct 2023 08:44 #891149
by Nessism
Replied by Nessism on topic Replacement CV diaphragms
The OEM Mikuni diaphragms are made from non-stretch rubber coated fabric, and in my limited experience, they are not easily removed from the slide without first cutting off the plastic retaining ring. Keihin diaphragms, on the other hand, are stretchy rubber, so you may have better luck in removing those. I suspect all of these replacement parts are stretchy rubber, not fabric. Regarding ease of replacement, good luck, particularly with the Mikuni parts.
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- Rolf1976_KZ900
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31 Oct 2023 09:31 - 31 Oct 2023 09:34 #891151
by Rolf1976_KZ900
Replied by Rolf1976_KZ900 on topic Replacement CV diaphragms
I have used similar on BS36 carbs they have worked fine for 3 years.I have not opened the lids to take a look at them since the bike still runs great. I bought them dirt cheap from ebay.
It is a little difficult to install them .I also have done some quality test on some pieces from one i torn on first attemt to install them. I placed the pieces in a bottle with ethanolmixed gasoline to see if they swelled or got distorted.The pieces are now after 3 years still in good shape.I made an writeup how to install then on yamaha forum i can post the writeup here if you want. The JBM at least for the fj1200 has a thick rubber ring that will inhibit the slide to rise full travel so you cant get full throttle open slide. I was a little concerned that the bike would be
jerky to ride since there are only rubber with no fabric inside,but bike runs smooth both on low and high revs and accelerate smoth.
It is a little difficult to install them .I also have done some quality test on some pieces from one i torn on first attemt to install them. I placed the pieces in a bottle with ethanolmixed gasoline to see if they swelled or got distorted.The pieces are now after 3 years still in good shape.I made an writeup how to install then on yamaha forum i can post the writeup here if you want. The JBM at least for the fj1200 has a thick rubber ring that will inhibit the slide to rise full travel so you cant get full throttle open slide. I was a little concerned that the bike would be
jerky to ride since there are only rubber with no fabric inside,but bike runs smooth both on low and high revs and accelerate smoth.
Last edit: 31 Oct 2023 09:34 by Rolf1976_KZ900.
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31 Oct 2023 09:54 #891152
by Nessism
Replied by Nessism on topic Replacement CV diaphragms
Yes, please post your tutorial...or at least a link. I'm interested in learning how you removed the diaphragm, and installed the new one.I have used similar on BS36 carbs they have worked fine for 3 years.I have not opened the lids to take a look at them since the bike still runs great. I bought them dirt cheap from ebay.
It is a little difficult to install them .I also have done some quality test on some pieces from one i torn on first attemt to install them. I placed the pieces in a bottle with ethanolmixed gasoline to see if they swelled or got distorted.The pieces are now after 3 years still in good shape.I made an writeup how to install then on yamaha forum i can post the writeup here if you want. The JBM at least for the fj1200 has a thick rubber ring that will inhibit the slide to rise full travel so you cant get full throttle open slide. I was a little concerned that the bike would be
jerky to ride since there are only rubber with no fabric inside,but bike runs smooth both on low and high revs and accelerate smoth.
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- Rolf1976_KZ900
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31 Oct 2023 10:00 #891153
by Rolf1976_KZ900
Replied by Rolf1976_KZ900 on topic Replacement CV diaphragms
Okay i will post how i did it just have to find it
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- Warren3200gt
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31 Oct 2023 10:39 #891157
by Warren3200gt
nrp-carbs.co.uk/kawasaki_carburettor_diaphragms.htm
Replied by Warren3200gt on topic Replacement CV diaphragms
If your not particularly in a rush, they are not the most responsive, but have genuine parts try here.Regarding ease of replacement, good luck, particularly with the Mikuni parts.
nrp-carbs.co.uk/kawasaki_carburettor_diaphragms.htm
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31 Oct 2023 10:43 #891158
by Wookie58
Replied by Wookie58 on topic Replacement CV diaphragms
Price doesn't look unreasonable given it includes fitting
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- Rolf1976_KZ900
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31 Oct 2023 11:55 - 31 Oct 2023 12:07 #891162
by Rolf1976_KZ900
Replied by Rolf1976_KZ900 on topic Replacement CV diaphragms
Last edit: 31 Oct 2023 12:07 by Rolf1976_KZ900.
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31 Oct 2023 12:10 #891164
by Wookie58
Replied by Wookie58 on topic Replacement CV diaphragms
Thanks Rolf, some excellent "outside the box" thinking to get the job done
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31 Oct 2023 16:45 #891172
by Nessism
Replied by Nessism on topic Replacement CV diaphragms
I've had some success by bending up the lip on the slide where it crimps down on the top plastic ring. The aluminum is work hardened, and doesn't bend easily, or without some damage. It is possible to slowly work the metal enough to get the ring off, though, at which time you can put the new diaphragm on, and then crimp down what's left of the lip to secure the ring. Get it wrong, and you can forget about doing it again, because the lip will just crumble if you try to bend it again.
I also did some slides where I machined a collar so to speak, using a lathe, to hold down the top plastic ring. I cut a groove on the ID of the slide, and used high strength epoxy to hold it in place. I've got some photos...somewhere. It took a goodly bit of lathe work, and I don't recommend it if you can purchase a good used slide instead.
I also did some slides where I machined a collar so to speak, using a lathe, to hold down the top plastic ring. I cut a groove on the ID of the slide, and used high strength epoxy to hold it in place. I've got some photos...somewhere. It took a goodly bit of lathe work, and I don't recommend it if you can purchase a good used slide instead.
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