Fuel valve - Kawasaki KLR 650 Forum
1987 to 2007 Wrenching & Mods For maintaining, repair or modifications of Generation 1 KLR's. 2007 and earlier.

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post #1 of 5 Old 03-19-2019, 07:36 PM Thread Starter
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Join Date: Mar 2019
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Fuel valve

Engine is starving for fuel above ideal. I think the fuel valve vacuum diaphragm is not working. Can I put a manual valve on the tank a plug off the vacuum line at the carburetor?
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post #2 of 5 Old 03-19-2019, 07:56 PM
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You are better off keeping the automatic OFF vacuum controlled fuel valve, IMHO!

Fuel valve diaphragm #43028-1033, maybe about $20.

Or just take the spring out of the diaphragm cap or the o-ring off of the plunger on the diaphragm, either of these converts it to a manual valve.
For testing purposes at least or forever, your choice.
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pdwestman
Modify at "YOUR OWN RISK"!

Still riding my 1987 KL650-A1. 84,000+ miles & counting
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post #3 of 5 Old 03-19-2019, 11:06 PM Thread Starter
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Thanks, I will give it a try.
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post #4 of 5 Old 03-20-2019, 08:20 AM
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Or . . . a more-or-less operational test:

Secure clean container.

Start engine.

Disconnect fuel line to carburetor; have container handy to catch fuel (if any flow).

Observe fuel flow (if any) from fuel line with engine running.

Kill engine, re-connect fuel line to carburetor.

CAVEAT: Never performed nor observed this procedure; just thinking: a healthy fuel low would indicate an operrational vacuum petcock; otherwise, execute Plan B!

“You better put down that gun. You got two ways to go, put it down or use it. Even if you tie me, you’re gonna be dead.” "John Russell" (Paul Newman), Hombre
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post #5 of 5 Old 03-20-2019, 10:05 AM
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Yes you can replace with a manual petcock; many of us have done it. Yamaha 660 Raptor Petcock
5LP-24500-01.01 also available from Eaglemike. You need to make sure that you turn the manual unit on and off for use so as to ensure you don't flood the engine with fuel in the event of a carb problem.

Dave
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