1981 Yamaha XS 1100SH vacuum diaphragm

**jetmechmarty** · 2026-04-10T23:54:43+00:00

Where is it weeping from? Parts are available to rebuild it. George Fix eBay Store, MikesXS and the like have the K&L rebuild kit. Be advised the pin is a tad too short, but there is a simple workaround for that. The diaphragm and o’ring are the only parts you can replace.

**jetmechmarty** · 2026-04-11T16:48:19+00:00

Vacuum Petcock rebuild kit - FAIL

https://www.xs650.com/threads/vacuum-petcock-rebuild-kit-fail.65527/#post-823663

I've had a couple of failed attempts at rebuilding vacuum petcocks. I thought the o'ring was wrong. I tried that. No help. Currently, I'm running some manual taps. @GLJ has solved the issue. https://www.xs650.com/threads/81-special.65260/page-4 I have an unused diaphragm from Dime City...

post #10 for the K&L

https://www.dimecitycycles.com/petco...ll-models/1980

Attached Files

**jetmechmarty** · 2026-04-11T16:56:03+00:00

Rebuilding Yamaha Vacuum Operated Fuel Valves (Petcocks.)

https://www.xs650.com/threads/rebuilding-yamaha-vacuum-operated-fuel-valves-petcocks.20662/

Copied with permission from XJbikes.com Written by bigfitz52 A more or less generic petcock rebuild how to, very useful for your 650 petcock rebuild. gggGary IF you are using a K&L petcock rebuild kit read here before you use the diaphragms and shaft part of the kit...

1981 Yamaha XS 1100SH vacuum diaphragm

1981 Yamaha XS 1100SH vacuum diaphragm

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