Hi,
Be sure to use the correct notched gasket to mount it on the manifold.
There is a vacuum port in the base that needs to get manifold vacuum into
it. If you block it, the power valve will think you are flooring the gas
pedal and dump extra gas in.
Bob B
At 09:20 AM 2/25/2003, you wrote:
>Paul asked some ?s:
>
> >My Zenith has two vacuum ports at its base. One goes to the vacuum advance
> >on the dizzy, the other goes to the PCV. The Rochester only has one vacuum
> >port at the base. My assumption is to use a "T fitting" to reattach the two
> >hoses onto the base of the Rochester. Is this sound?
>
>Yes...alternatively you could drill and tap the intake manifold for a
>proper sized hose barb.
>
> >Second, I've always wondered where the "port" on the crankcase cap should be
> >hooked up to. It looks like it should have a hose connected to it. My PCV
> >hose attaches to the oil filler tube (about half way down).
>
>On a SIII there should be a nipple on the side of the metal portion of the
>carb-to-air cleaner hose. Attach the breather hose there. It's purpose
>is to take fumes from the head region and re-burn them by feeding the
>intake. The tube from the oil filler, which vents crankcase fumes,
>connects to the PCV valve. Alternatively you could eliminate the PCV and
>extend the hose(s) to some safe location behind the engine to allow the
>fumes to just escape to the atmosphere, (but don't tell the EPA I said
>so). Some LROs have been known to feed this hose into the frame...where
>it acts as a self-oiling rust preventer. If you don't take that route,
>terminate the hose end with a suitable small clamp on air filter (check
>your local motorcycle shop), and keep it high enough to prevent the entry
>of water during deep wading.
>
>A 2.25 w/Roch carb will benefit greatly from the increased flow rates that
>a K&N or other aftermarket air filter can provide for on-road use, as the
>Roch can flow up to 165cfm, compared to the 137 or so the Zenith
>flows. On the highway the oil bath can be a bit restrictive at cruising
>speeds. I'd recommend though, that you retain the oil bath for off-road
>use/dusty conditions.
>
>JT/ric
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