Page 4 of 6
Getting Down to Business
Note: This article assumes you have already removed your stock carb and installed a Mikuni HSR carb.
Remove the seat and tank. Disconnect the positive battery cable.
Locate the TPS electrical connector near the upper motor mount, just behind the left-side coil. It is a connector left over from removing the stock carb, and has three wires to it--yellow, blue, and blue/black. We will be tapping in to these wires, so the VOES is logically mounted nearby.
Next, you must decide on a vacuum source. The Mikuni HSR carbs come with an on-board vacuum-port--very handy.
Some owners, however, feel that the vacuum source should be as close to the heads as possible, to increase the accuracy of vacuum readings. The stock, and stock-type ported, intake manifolds have an integrated vacuum nipple that can be used as a source, but I have a Nemesis Racing aluminum manifold, which does not include any vacuum access. To remedy this, I could drill and tap a hole, and then mount a nipple in my manifold. After discussion with some others that have a similar setup, I decided that the benefit of doing all this would likely be minor, so I just used the carb's vacuum port.
If you will be using the carb's vacuum-port, locate it now. It's the rather long nipple that sticks straight up, at the rear of the carb. See photo below. Note: you may have to remove a plug-cap from the nipple if the carb is not new.
Take the vacuum hose you purchased (or found) for this project, and push it all the way down onto this vacuum nipple (or onto the manifold nipple, if you prefer). Then put a clamp over the hose--optional. Leave the other end of the hose free, for now. We'll finish it in a later step.