JBM Industries

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Keihin Replacement Diaphragm Page

JBM Industries replacement Keihin Carburetor Diaphragms for Kawasaki KZ250 and KZ440 & CSR305 twins & KZ750/4 with key groove and 71 mm. (Keihin CV-32)
JBM also has 67 mm square groove for Kawasaki Ninja & Vulcan 88 1500 Keihin CVK36 carburetors replacement carburetor diaphragm for your vintage motorcycle. Shown here is a Keihin with 71 mm "keyed" groove diaphragm for Kawasaki KZ440 LTD.
At bottom of page: 78 mm diaphragms fit Vintage Honda 360, & 73mm fit CB or CL 350....
67mm fit Kawasaki Vulcan CVK36 carburetors. All diaphragms are installed by removing both retaining rings. Older carbs may have metal rings, but they can be cut with a good pair of side cutters in the same manner.

NOTE: When using side cutters to cut metal retaining rings, "Rock" the cutter back and forth from side to side to split ring.

Note: All JBM diaphragms are made from our special TSR compound for the longest lasting parts available.

Honda 360 & 350: Air holes in the slide go on the intake side!

Order K-78mm Keihin Diaphragm for Honda 360

Order K-73mm Keihin for Honda CB or CL 350

Diaphragms shown here fit the Keihin CVK 36 used on the Kawasaki Vulcan 1500cc & Ninja 900 "FLAT SLIDE CARB"
See note Below about Vulcan VN750 VN700

JBM replacement carburetor diaphragms for your vintage motorcycle are made from special TSR compound that resists heat and fuels with ethanol.
Diaphragms have a smooth "rolling" action and eliminate the possibility of leakage at the plastic rings.
JBM carb diaphragms are easy to install, and inexpensive, giving added life to old bikes.
Restores smooth operation and original fuel economy.

NOTE ON K-67 Diaphragms: These definitely fit and work on my bike, so they'll work on any Kawasaki Vulcan 750 (VN750) and 95% certain that they'llwork on the VN700 because that was just the 750 in a 700cc version due to the Harley tax in the 80s. These bikes have two Keihin CVK34 carbs in a v-twin setup.

What our Customers are Saying...

"Installed my new K-67 diaphragms on my Kawasaki VN700. I recently ear shaved and rejetted but wasn't getting the throttle response I was looking for. Your product completed my carb rebuild. Am 99% sure K-67 will fit all VN700 and VN750 from 1985-2006. When I go online to look for parts for my bike I usually look under VN750 because there are more parts available for them and everything has fit. Anyway, great product, great price. Will recommend to others and will order more in the future."

"Just wanted to say I got those 2 cb360 diaphragms today. They're installed and my bike is back running like a bat out of hell, better than new. Thank you so much. ......Steve"

"I wanted to send a quick note to let you know that I received my k-71 diaphragm for my 1980 Kawasaki kz750h 750/4, which has keihin cv34 carbs. I thought you might like to update the site with cv34 fitment info, as it currently lists cv32 for the k-71. Your instructions were excellent, product is excellent, installation only took about 15 mins including removing the old clips and diaphragm, and the JBM diaphragm fit the keihins like a glove! No need for any glue, and its literally a perfect fit! Also, I recieved my package with 2 days of payment, absolutely awesome service! -Chris Benoit, oak ridge, TN, USA."

"Hey, I just wanted to say thanks for the diaphragms I ordered. They came in today, and were easy to install and fit perfectly. They completely solved the problems I was having with my motorcycle carbs. Much better than spending hundreds on new slide/diaphragm assemblies! :) Tim OBrien"

"NOTE ON K-67 Diaphragms: These definitely fit and work on my bike, so they'll work on any Kawasaki Vulcan 750 (VN750) and 95% certain that they'll work on the VN700 because that was just the 750 in a 700cc version due to the Harley tax in the 80s. These bikes have two Keihin CVK34 carbs in a v-twin setup."

"Back again!! I ordered two diaphragms, K-73, for my 1968 Honda CL350 a couple years ago and they are GREAT!! I have a couple friends with vintage CB 350s as well that were skeptics when I first installed them. Well, two years later their diaphragms are "melting" form pump gas and mine are still as strong as the day I installed them! Not surprising that they are now asking me to convert their slides to your diaphragms as well.Thanks for providing such a great product!! You're saving lives (motorcycle lives). Peter Shelley"