Carburetors w/ accelerator pump

Hello all.

Working on my second KZ650, this time a low-mile '79 650SR. Permission red, drilled discs, etc. BUT the carbs on this one have an acclerator pump on the #2 carb. I've rebuilt many sets of these slide-type carbs but this is actually the first batch with a pump on it I will be tackling. They are in rough shape ... gummed up and stuck. Aside from the usual clean/replace O-rings/gaskets etc. is there anything on this accelerator pump setup I should know? I have a pair of repair manuals (one official Kawasaki, one Clymer) but any additional insights by someone who's rebuilt a set of these would be MUCH appreciated.

Be sure to rebuild the pump - Z1Enterprises.com should have a K&L kit (made in Japan). I installed one of those & it has worked fine. Make sure the float bowls have a ball, weight & clip on each one - they act as a check valve. The base of each pump nozzle should have an o-ring on it (located on the underside edge of the carb body).

To check the functionality of the pump: supply fuel to the carbs & prime the circuit by actuating the throttle pulley. Then do it some more vigorously - fuel should squirt out the pump nozzles & project into the carb bore straight back without hitting the sides. If the stream is askew or dribbles out, you'll need to clear those passages.

or just by-pass the mess with standard bowls

Really? You can just switch out the float bowls for a standard set with no ill effects? Then what is the "benefit" of the accelerator pump?

barquirt wrote:

Really? You can just switch out the float bowls for a standard set with no ill effects? Then what is the "benefit" of the accelerator pump?

The accelerator pump was added in I believe '79 because jetting was dropped down anywhere from low to high 90 jets. The lean jets required a small shot of gas to alleviate the lean condition when cracking the throttle. I put in a set of "stock" size 102.5's and might remove (un-hook rod) pump system as I no longer want "extra" gas being pumped in. I also have an extra set of '78 carbs I might rebuild and install in place of the pumpers.