Rebuild Accelerator pump '79 KZ650SR or make it walk the plank?

Carbs from my 1979 KZ650SR needed some attention and the accelerator pump internals does not look great.

Kawasaki suggests that
43028-1010
43028-1012

Are no longer produced. Suggestions welcome. I guess mine are not falling apart and could be re-used. Wasn't there a thread once here on how the acc pump on these old carbs was best made to walk the plant or blocked off?

The bike is coming together. I look forward to putting a lot of miles on it this summer. Those tall wheels with modern (ish) rubber are 100% wonderful to ride on.





 

I guess the diaphrams are the only real "wear and tear" part, if the plunger rod on the diaphram has a "wear" ridge causing a tight spot in operation, what we used to do in the car world is rotate them (the wear only happens on the thrust side)

Thanks, Wookie.

Looks like K&L makes a kit. Ever used it?

K&L 18-2903

Do you mind if I ask you which tires are you using on your 650?

chopper1963 wrote:

Thanks, Wookie.

Looks like K&L makes a kit. Ever used it?

K&L 18-2903

No I haven't, sorry 

Kofla wrote:

Do you mind if I ask you which tires are you using on your 650?

Love the new avatar Kofla, you seem to have this cartoon gig nailed down

Bridgestone BT46s. I used BT45s previously.

 

Thank you! 

chopper1963 wrote:

... Looks like K&L makes a kit. Ever used it? K&L 18-2903

yes. also. k&l petcock diaphragm, fork seals, caliper kit, electrical connectors, etc. never had a problem. made in Japan.

chopper1963 wrote:

Suggestions welcome. I guess mine are not falling apart and could be re-used. Wasn't there a thread once here on how the acc pump on these old carbs was best made to walk the plant or blocked off?

Just remove the actuator rod and leave everything else as is. You may want to up your jetting to match non pumper VM24's.

if the AP is disabled. the FSM may have a table with non-US jetting. problem is it can be pretty involved. on the 81 csr the main jet, needle jet, jet needle, and starter jet are different for non-US models, plus the jet needle is clipped and the throttle valve cutaway is different. some probably just swap out the main jets and maybe clip the jet needle. because most of that other stuff might not be available or is too $$$.

Chopper i can almost 100percent guarantee you will have a tremendous "bog" disabling the Accel pump with these carbs jetted for it! There's MORE going on then just switching around the brass and slides. That's why 1015 sells those air correction jets! If it were my project i intended to ride i would "CUT" the rod off the SENSOR Diaphragm to start. There's a singular ball bearing that shuts off fuel to the accel pump. Reinstall it to keep fuel from falling out. And replace the Accel diaphragm. Or..just buy a pre-emissions set of KZ650 carbs. They are cheeep.