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Replacement CV diaphragms 31 Oct 2023 07:58 #891147

  • slmjim+Z1BEBE
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Has anyone used replacement diaphragms from here?

www.carburetordiaphragms.com/

Were they acceptable?

Good Ridin'
slmjim & Z1BEBE
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Replacement CV diaphragms 31 Oct 2023 08:43 #891148

  • Cra-z1
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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

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Replacement CV diaphragms 31 Oct 2023 08:44 #891149

  • Nessism
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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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Replacement CV diaphragms 31 Oct 2023 09:31 #891151

  • Rolf1976_KZ900
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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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Replacement CV diaphragms 31 Oct 2023 09:54 #891152

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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.
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.

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Replacement CV diaphragms 31 Oct 2023 10:00 #891153

  • Rolf1976_KZ900
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Okay i will post how i did it just have to find it

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Replacement CV diaphragms 31 Oct 2023 10:39 #891157

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 Regarding ease of replacement, good luck, particularly with the Mikuni parts.
If your not particularly in a rush, they are not the most responsive, but have genuine parts try here. 
nrp-carbs.co.uk/kawasaki_carburettor_diaphragms.htm

Z1000J2 somewhat modified!

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Replacement CV diaphragms 31 Oct 2023 10:43 #891158

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Price doesn't look unreasonable given it includes fitting

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Replacement CV diaphragms 31 Oct 2023 11:55 #891162

  • Rolf1976_KZ900
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Well here is how i did mine not the best tutorial ,but it can be helpful and it is not hard to do.
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Replacement CV diaphragms 31 Oct 2023 12:10 #891164

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Thanks Rolf, some excellent "outside the box" thinking to get the job done

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Replacement CV diaphragms 31 Oct 2023 16:45 #891172

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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.
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