How about ZRX carbs or Bandit carbs?

Hi, a quick way around this is to just get a ZX12R. When I had my ZRX1100 the standard engine was a freak, maybe because I was used the torque hard which beds those rings in nicely. Anyway we had a small group of riders with ZRX1200 and ZRX1100 who had ZX1100 cams biggers carbies various pipes between them for racing etc.
To cut a long story short we (4 of us) went for a ride on some back roads, they decided to line up and do top gear roll on's to 200kph +, mine was that quick they accused me of taking off in 4th gear, it wasn't till one of them rode my bike and I his that they realised it was that quick (by 200kph from 80 my bike was around 6 to 8 bike lengths in front), not only that but on the drag it was also quicker (their 3 were very even). The guy that rode my zrx also couldn't believe how well it handled through the rough roads compared to their special suspensions and to top it off my fuel aconomy was a lot better (average 270km before reserve).
So when I did work on my Z1R it was gradual and if there was no improvement it was back to standard until everything gelled ,while others would add parts because some racer uses them I made sure they worked first, the other reason was that I couldn't afford some of the special bits.

Bozo wrote: Hi, a quick way around this is to just get a ZX12R. When I had my ZRX1100 the standard engine was a freak, maybe because I was used the torque hard which beds those rings in nicely. Anyway....
, I couldn't afford some of the special bits.

No, it isn't. I like 'em naked. :whistle:
the standard 1100....bring it :evil:

Bozo wrote: Hi, new to this forum (4 years late), but I thought I'd let you know that I have had zx900R carbies (34mm) on my Kawasaki Z1R 1978. To fit these I spaced the two middle carbs by welding spacers (including the choke activator). These were 100% better then the standard units in response, power and fuel economy.

I now have ZRX1200 carbs (ebay $150) these are 36mm.I don't use the butterfly sensor. All that was required was the main jet changed to 132 and the pilot to 40.5. With 1080 MTC pistons Z1000J valves and mild speedway cams this things flies ( 11.3 1/4mile) and the fuel economy is around 58mpg (australian) at a steady 110kph.

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I'm trying to fit a ZRX1100 carbs(Keihin CVK36) on my 76 KZ900A4. How did you clear the spacing issue? Did you have to fabricate a bracket or manifolds to fit them on yours?

Richie,
I made manifolds that mount onto the head with countersunk screws, these flanges have an inner flange (same pattern as the GPZ900R) which allows the GPZ900R rubber manifolds to mount.

Since I knew a machinist it took bugger all time to make these. I also made the inner section of the flange to taper/ funnel from 34mm to match the head intake opening for a good flow.

Good luck, let me know how you go. Sorry if the picks are crappy.

Bozo wrote: Richie,
I made manifolds that mount onto the head with countersunk screws, these flanges have an inner flange (same pattern as the GPZ900R) which allows the GPZ900R rubber manifolds to mount.

Since I knew a machinist it took bugger all time to make these. I also made the inner section of the flange to taper/ funnel from 34mm to match the head intake opening for a good flow.

Good luck, let me know how you go. Sorry if the picks are crappy.

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That is the stuff I like to see. Some real out of the box thinking for solving a problem. Good job on the adapters they look like they will work pretty good and they also look great

Thank you for the info. I'm gonna go to a local junk yard and make something like you did. Awesome Z1R BTW

Bozo wrote: Richie,
I made manifolds that mount onto the head with countersunk screws, these flanges have an inner flange (same pattern as the GPZ900R) which allows the GPZ900R rubber manifolds to mount.

Since I knew a machinist it took bugger all time to make these. I also made the inner section of the flange to taper/ funnel from 34mm to match the head intake opening for a good flow.

Good luck, let me know how you go. Sorry if the picks are crappy.

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Thanks again, the beauty of my Z1R is that it is as awesome to ride as it looks, I use it every weekend (200 to 300kms) and the only time I check it is during the cleaning time (once every three months) and servicing (it only uses around 200ml of oil every 5000km). It gets a good thrash now and then. I don't like straight lining much but through the bends up to 160kph it tracks nicely for the old girl she is.

This is very interesting. :woohoo:

Really nice looking z1r.I wish I would have bought one back when these bike were cheap.I was considering buying some smooth bore carbs for my kz1000,then I read this post & seen what Bozo had put on his z1r.
I bought a set of 03 zrx 1200 carbs off eBay & started figuring.I used the stock kz manifolds,I just took a sanding wheel & reamed them out to fit the zrx carbs.I put the manifolds on an old head I had & reamed them out to the same as the head.I beveled them in the middle to make the fuel & air to flow better.The zrx carbs are spaced the same as the kz carbs between cylinders 1,2 & 3,4.The space between 2&3 cylinders is longer on the kz.I cut the metal carb brackets & the choke slide.Then welded a piece of metal to lengthen them.I had the carbs on the old head on a milk crate.The butterfly linkage need lengthened also.I just welded a piece of metal on it to lengthen it also.The fuel tee is long enough to seal,even after spacing the carbs.I took a piece of vacuum hose & put on each side of the tee,to keep it from working to either side.It would leak fuel if it walk to far either way.Maybe it woud'nt move but I didn't take the chance.I split the hose that I put on the tee,& zip tied it on so I didn't have to remove the tee.
I tryed putting a 900 air box on it,that didn't work out.So I bought a set of k&n pods & a k&n crank case filter.I had to punched the main jets to .0565thou,that's equal to a 146 keihin.I went to a 40 pilot,which was a mistake.I should have left it a 35.I didn't touch the needle position.I was running 28mm Mikunis.I had the Mikunis tuned as good as much as I could get out of them.The zrx carbs make crazy power,Bozo is right.I could probably go one more on the mains,but I'm gonna ride it a while then check the plugs.The engine is 1075 pistons,425 lift cams,z1r valves.Its that kind of power that makes you wander if your gonna get slowed down for the turn.Sorry for no pics,but they got deleted off phone.The jetting was the hardest thing of the whole project.

Hill, what is the midrange like?, I have to admit I have the MTC 10.25:1 pistons speedway cams (for mid/top) and J model valves, but my mains are 135, the needle is spaced up with 2 x 3mm flat washer up from middle (some ZRX carbies don't have a slide needle adjustment - some do??). The pilots are 40 - I think. The filters I use now are RAMAIR because I found the K&N tend to dry out from petrol vaporised out the carbies, once the K&N filters are dry they don't leave much protection from fine dust whereas the RAMAIR or UNIfilters still have some protection.

I get outstanding economy with the current setup i.e. the plugs at 120kph are a dark grey colour.
The beauty of these carbs is that the vacuum slides compensate to give an even air flow so you never get a flat spot.
Let me know how it turns out once you have the bike running properly.

When I first posted that I installed the zrx carbs I was a little mixed up about the tune.40 pilots are correct.I tuned it by just running up the road & back.Untill I rode it a few miles,I didn't notice it was rich with the 146 jets.I went back to a 130 & started stepping back up.Im at around a 140 now.I put some 60 thousandth clips under the needles.I got the clips off some old kz points.This bike pulls hard all the way through the throttle.I can feel the front end coming up in 3rd on a hard pull.

Hill, what is the latest? how is the bike running?, how is the economy?.