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VM34RS / VM36RS Fuel Petcock Options

You may want to switch to an Aftermarket Fuel Petcock  if you are going to a high-perfromance carb setup.
These fuel valves will work fine if you are using an "A" model (standard / large) fuel tank.
On certain Kaw 900's and 1000's, however, especially those using a "B" model (LTD) fuel tank,
clearance problems can occur with the stock fuel valve or with a Pingel valve when using VM34/36's.

From a mechanical standpoint,  a high-flow petcock is not essential on a street bike when switching to
performance carbs like the Mikuni RS series. These, and other such carbs are designed with a high-capacity
float bowls. This insures that the carb will be able to provide enough gas during high demand conditions.

The info below explains one way to deal with the interference that sometimes results when mounting
RS carbs and using a stock petcock, especially on LTD models.....

In the picture above left, a standard 1977 KZ1000A fuel petcock is used in conjunction with a VM36RS installation.
When using a larger Z-1 or 900/1000 "A" model tank, there is usually no interference between the petcock handle
and the #1 (far left) carb top. This is also the case when using a Pingel petcock.
Fuel valve is shown in the "Off" position.
In the picture above right, the same carbs are mounted using a smaller LTD or "B" style tank. Due to the slightly
different relative position of the petcock that results with a "B" tank, the fuel valve handle will hit the #1 carb top.
This problem will also often happen with a Pingel.
To solve this, the petcock in this pic has been modified to act as a "reverse" petcock.
 In the "Off" position, the handle now points rearward.....
"On" is handle up, and "Res" is handle down.....Exactly the opposite of original. Problem solved.


This modification is not difficult. If you don't want to do it yourself though,  we charge $40.00 to do it for you.

In the pic above right, you can see the handle retaining screw has been moved from the bottom of the petcock to the top. This creates a "reverse petcock".

In the pic at left, you can see the blank pad left on the stock  petcock when the part is cast. While these petcocks were drilled for 900's and 1000's to locate the retaining screw at  the bottom, the same castings were used for other Kaws that were drilled on top. The undrilled "flat"
in the casting remains.

By simply removing the handle, and carefully drilling and tapping to 4mm X .7mm 180 degrees across from the original hole, a "reverse" petcock is made. (See pic Below).

Re-install the handle backwards from the original, put the screw in the new hole, and you're done.
 

 

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