1979 Mikuni 26ss pumpers *the pumper bowl *

this is a KZ1000 ***will the 2 stage pump bowl on the 1979 vm 26mm pumper fit on a 1979-80 vm28 pumper carb.. i kNOW THE 2 STAGE PUMP FROM THE 26 HAS A LONGER DURATION SPRAY AND IS MORE EFFECTIVE THAN THE vm28 single stage pump on the 79-80 KZ1000's... I did read where the pump from a 24 will fit it?? I don't know but I have achance to get a set of 1979 Mikuni 26SS mm pumpers.. These carbs are very rare as they only used them on the first 1979 KZ1000B models.. after that they used the VM28's

I know the float bowls will physically fit from VM24's to VM26's and VM28's, because I went the other way removing my accelerator pump from my 28's by fitting bowls from a set of VM24's, If they fit then, then they can be made to work as the accelerator pump jets etc. will all line up. It seems a VM24 would also fit as I have a set of pumper VM24 carbs. So the answer is yes.

From the 28 and 24 pumper carbs I have, it would appear you would only need to find the double pumper float bowl that has the pumps on it, every thing else looks identical.

I appreciate that RedHawk.Thank you.

You are welcome, I'd be interested to see how you find it operates, I decided to do away with the accelerator pump set up on my 28mm carbs as it wasn't operational and I was aiming for simplicity, the older models didn't use the acceleration pumps. It would be interesting to see how the double pump systems performs and what the advantages will be.

I am 62 years old & I have several old motorcycles. I just put a set of 28 pumpers on my Z1A engine and man did it wake it up.. I got a set of 1978 Z1R carbs too.. they look just like the 77-78 Mikuni 26's , no pump ,but they are 28 and they have the idle adjust knob on bottom. I was going to put those on my Z1A chopper engine but I was working on a set of 28 pumpers and wanted to test them after cleaning and resizing the jets...so I put them on it and run so good they are staying ... Nice because I do have electric start but I always use the kicker.. I can twist the throttle a couple times and that gives it a squirt and it starts first time every time.. The other day I was reading up on the 26mm pumper ..I had heard they made them but I never had one.. so I kept reading and found they have a better delivery system. Why not find a set of these 26 double diaphram pumps and put those on my 28's.. From what I understand the stream lasts longer .. that chopper runs like hell now.. I am always wanting to try something different ~~ it might be better yet. I will post results after I check it out.. I appreciate the advice because I didn't want to buy a set of those 26's unless I could use the bowl.. They are a useless carb othrwise from what I have read ...

I've currently ditched my accelerator pump and am so far happy with the results with appropriate jets. My bike came with 28 pumpers from the 1980 model in place of the 26's that would have been on my 1978, but the pump was not functioning and I'd heard they could be temperamental if the bike sits and the gas evaporates etc. - I felt simplicity might be the watch word. I already had a set of 24 pumpers i was toying with putting on my KZ650B1 at some point, and also another a set of 24's as spares carbs with no accelerator pump. I used the bowls from that set on my 28's. So far I've decided to hang onto all the extra parts, just in case I wanted to go back, but now with you doing the guinea pig work for a double pumper set up on 28's, if that has real benefits, I have all the parts to hand

You probably know more about the pumpers than I. This set I just cleaned and re-jetted to run on my (little bit souped up) Z1A engine is the first set I ever had.They have been on a ledge of my bike building for 8 + years... I have always liked the 77-78 26's. and of course the 29's are the best for performance for as far as the older carbs go. I am sure the carbs are just fine without the pump... as long as they are jetted correctly...that was the entire purpose in the first place for them...so the Japs could run leaner (smaller) fuel jets in the carbs and pass emissions control tests...I wasn't sure if the pump worked on these or not so I jetted them for my bike # 120Main & a # 20 slow jet.. I am very happy with this carb set up. I only have maybe 12 -15 miles on it since I put the new pistons and rebuilt head on it. . I am FINALLY getting a kitchen stove with an oven that works so I can start doing the rest of my heads without stinking up my house! I heat them to 450 pop out the guides.. No damage & makes it easy. Good thick gloves!! ..My name is Gary and I have read this for several years & learned alot form some of these guys.. I can always reaad the ones from Larry C. and Plummen and Folks with confidence.. there are others too .Those are the big 3 that come to mind at the moment. I am not an expert but I have rebuilt a few of these old Z1's and KZ1000. even a couple 1983 GPz1100 & Police 1000 after 81.. I do my own valve guides and hav for 25 years. I don't know it all but I know enough to get into trouble! Been fascinated with carbs for 4 or 5 years now and all the variables that come along with jetting and engine mods. I will keep ya posted about the older pumpers.. There is a guy George from Texas. (I use to live in Texas) and he is a carb genius...I learned a lot from reading his stuff here.... He probably could tell us already how good this will work... My guess is.. Probably not a noticeable difference....but I am going to do it anyway. Thanks for the interest RedHawk.