JBM Industries

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Vintage Honda Motorcycle Carburetor Diaphragms for PLASTIC Keihin slides.

This page will show you how to install the JBM Industries rubber carburetor diaphragm on your Keihin carburetor used on '84 to '96 Honda VT1100, 700, 800, & CBR 1000F Hurricane motorcycles. These are "VG" series carbs.
The JBM Diaphragms are made from TSR rubber and must be glued to the throttle slide, as the slide is made of plastic. The original diaphragms were held in place by a plastic ring that was glued in place. The JBM diaphragms use a thick rubber "tire" that is glued directly to the slide using Super Glue "Gel" type adhesive. The Super Glue "Gel" can be purchased at "Family Dollar Stores" for $1. JBM does not ship this adhesive with the diaphragms. This same method & diaphragm is used on Honda GL1500 / 6cylinder Vintage Motorcycle.
These diaphragms fit a 72mm diameter groove Keihin "VG" series carburetor. The diaphragm has a "key" with a small hole molded in, so you do not need to purchase O-rings. The carburetor shown here has a small tube through the key, but this is non-fuctioning on this carb, as the cover plate blocks this off.
Honda V4 1100 models have metal slides and use our K-72-S diaphragm with smaller central hole in tire.

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

What our Customers are Saying...

"Hi, I received the carb slide diaphragms' that we order this week, we installed them and they work. I don't remember the part number but I think they were 72mm. Any ways they worked on a Honda 1984 VT700C.
Thanks Bill .....The Parts Store & Service Center, 51073 Milano Drive, Macomb MI 48042"

"You guys request to know what applications these can fit-- I am installing them in carbs from a 84 vt700 honda they should fit any 83-85 vt700 with that groove diameter this will be the 3rd set i have installed on these type of bike, first time buying them from your company, others don't last and don't fit correctly without modification. Your version definitely show better quality and craftsmanship. We will be spreading the word that you guys have these available for a lot of models.
Thanks again, Dan Reckmo"

"Hello,
The replacement Carburetor Diaphragm came it today. The quality of these parts is perfect and better than the original in my opinion. I am working on Motorcycles since 1979 and was happy to get these high quality spareparts. Thank you very much for your kindful help and assistance and the fast delivery.
Berlin/Germany WOLF......
http://www.hondashadow.net/forum/72-technical-discussion/131661-torn-diaphragm-repair-possible-2.html#post1371429"

"Subject: GL1500 Diaphragms
The K-72 worked perfectly on the GL1500 carbs. They are the same. No modifications required. A bit of super glue and that is it. Go ahead and list them for the GL1500. Obviously Keihin used the same slides in them. Bike runs awesome again. I will pass this info on over at the forums. Thanks"

"I just wanted to tell you thank you so much! The K-72 diaphragm worked perfectly on my 1986 Honda VT1100c Shadow. jaybasich Greendale Wisconsin"

"Thank you for sending the first diaphram I purchased. Skeptical i only ordered one, It was the easiest modification I have made and saved me well over $100. I would like to order one more K-72 to finish my gl1500. Thank you delatte5854@hughes.net NOTE: JBM reccomends that all diaphragms be changed at once for balance."