Accel pump diaphragm source?

Hope someone here recognizes this and can help me find a diaphragm.

This accelerator pump was mounted between float bowls number two and three in an aftermarket sort of fashion. It feeds tubes that go up to holes that have been drilled and tapped on the intakes of the carburetors for nozzles. The carb set in question resembles a VM29 in every way except for the bowls, which do not have the jet-access-plugs.
 

Thanks for any help. So good to see KZrider is still around!

I have one.  Normally reserved for people buying an O-ring kit, but I'll make an exception.  Send a PM if interested.

Ed

The Kawasaki part# for the diaphragm used on the 650 and 1000 bikes is  43028-1012. I found several locations that sell kits which included this item. with a simple search. Now I do not know if the pump you have is the same as those used on the bikes mentioned.

I know that Mikuni sold kits for pumps on 29s  see attached and it looks much like those on other carbs (vm24ss vm26ss and vm28ss)


But you make is sound like your system looks more like this (this is a set of vm28sc carbs with a pump).


As long as the diaphragm is the same size the part number posted above should work

I bought the cheap probably China eBay one and while it seeped for a while on the 650SR it has now stopped and all is well.

   

Allow me to begin again. I’ll start another thread about the actual bike but suffice to say the frame number, VIN, title, case stamp, and cylinder stamps all point to a 1977 KZ650. Appearance would cause one to identify it as a C model, but papers call it a B. Obvious mods include pods and 4 to 1. The scooter has been sitting under a pile of blankets in the attached garage for 8 years, having gone into unexpected long-term storage with a full tank of gas. The bike “ran fine to me but the carbs need gone through,” I was thinking at the time.

Enough about the bike. I believe I know what I am about, as a 25 year inmate of the automotive repair industry, and still laboring thus, I am looking for salves to the wounds inflicted by children fleeing the nest.

I was well beyond halfway through disassembling the carburetors and cleaning them up when I began to notice discrepancies from the printed Kawasaki service manual that came with the sale. Please do not be concerned by what appears to be a general state of disorder in my approach to organization in the picture. Again, I know what I am about, and I know what parts go to what, as far as mated assemblies go. But I can assure you, I need to replace every piece of brass, gasket, and rubber on this completely incorrect carburetor…so I intend to put it back together the way it was, and go from there.

Here I’ll copy and paste my notes. They’re intelligible enough to me, but I apologize if I’m just cluttering up the internet.

Carbs on KZ650
Strongly believe to be some early variant of the Mikuni VM29. Does not have the normal bowls but everything else the same. 

Main jets 130
Needle jet #261 0-4
Jet needle marked 5DL31
Pilot jet 17.5
Air screw .65 turn out, no marking
Throttle valve stamped 1.5?
 **you need at least one needle and clip!!! (2 pitted, one damaged at e-clip grooves)** 
One of the pilot jet screwdriver slots is buggered up. Did not remove. 

Carb throat to intake measures 29.5mm 
Would like throttle shaft seals, at least one is smashed and they all seem dry 
Connecting pipe o-rings, a couple are buggered, but the others seem squishy enough??
Jet block gaskets!  
Fuel hose for accel pump
Diaphragm for accel pump 
Pods. Do I need to modify them? Rear tank rubber  
Killswitch? Needs disassembled.
*For sure need starter button and spring, etc.* 
Tachometer cable?
Need to get some glass fuses
Oil, filter, etc..

Thanks for any interest. 
 

Those look like VM29's.  Valuable carbs.  If you have the energy, I'd rebuild them and sell, then buy a set of VM24's, and rebuild those, for the bike.  VM29's are worth about a grand these days, and VM24's are dirt cheap.

The accelerator pump was an add-on kit for those carbs.  

ebay.us/m/ovWYSg

eBay seems to think these won’t work on my bike… But they’re perfect match for the pictures in the service manual. 

The bike has pods, four to one exhaust, and an aftermarket oil cooler installed. Is there anything I can do without tearing the engine down to get an idea of what other modifications might’ve been made? In any event, how souped up could this 650 possibly be to necessitate VM29s?

i’m slapping my forehead right now. You have such a great idea. The carbs I have are superfluous and I could probably buy two sets of the proper carburetors to have a swing unit for re-jetting, etc. for the price I will have into brass, O-rings, and gaskets. I’m gonna put this carb back together with the parts that are on it and find it a better home. I will leave it to the person who actually uses it to replace all the expensive pieces that it needs.

Thank you again.

In the past there have been posts here and on other forums where the 29s were used on 650s (not by me) which indicated they worked for them. I have always felt they were maybe a little big for a stock engine, but what do I know? Will say your indicating they have a main of 130 certainly sounds too large to me, but it could be the engine displacement has been increased? There have been kits sold  that could increase up to 810. You asked what short of tearing into the motor might give you an idea if such increases may have been made. First, remove the valve cover and see if the cams appear to be stock or after market, some are labeled or marked to indicate such.The cam sprockets may or may not have slots to adjust cam timing.Stock units did not have this. You should also be able to see if the cam chain is Hy-vo or roller chain. If roller it would tend to indicate the older 650 crank. Somewhere around 80 nor 81 the chain changed from a roller to the Hy-vo. Not that this was not stock on the 650, but is certainly was not for a 77.

 I guess prior to pulling the cover check out the engine number to see if the cases are 650. It should be KZ650 and either BE or DE. There should also be a label on the barrels either 652cc or 6,5l to indicate stock 650 unit. If on the other hand the engine number is KZ750 or the barrels have 7.5l then it is not a stock 650.I know in the past many "hotroded" 650s with later 750 parts and aftermarket parts.

Case and heads stamped for 650. Should I post some more pics in another thread? (I don’t want to post something about camshafts in the carburetor forum, especially if that is frowned upon here) I took the camshaft/valve cover off and snapped a few. I’m not getting the sense there’s been any monkey business, but I wouldn’t mind other opinions.

Sendhendrix wrote:

Case and heads stamped for 650. Should I post some more pics in another thread? (I don’t want to post something about camshafts in the carburetor forum, especially if that is frowned upon here) I took the camshaft/valve cover off and snapped a few. I’m not getting the sense there’s been any monkey business, but I wouldn’t mind other opinions.

If this is going to "morph" into a motor post then starting a new thread would be appreciated

The pics of the top end look stock 650 to me.

Those VM24's look kinda rough.  Fixable, but don't shortcut the cleaning process, and be sure to replace all the various O-rings and gaskets.  

Regarding the engine shot, the only thing that comes to mind is to change the rubber intake boots (assuming they are the originals).  45 year old rubber engine parts are typically ready for replacement.