'86 GT550 31mm carbs airbox identification

Hello,

recently i bought GT550 which is also called Z550G3 model, although in running condition it has several issues i want to sort out, like cleaning, adjusting, replacing fluids, leaking exhaust etc.
I pulled the whole airbox and carbs out, and realized my new rubber adapters between the carbs and airbox are too small, although part numbers 11015-063 and 11015-057 are correct for this model.
So one of the previous owner (there were must have put some different carbs (31mm) and airbox setup, since the stock carbs should be 26mm for this year model.

Here are the measurements, i also attached pictures:
carburetors: 31 / 36mm engine side, 46 / 50mm airbox side. TK CV V073 5B12
airbox: 52mm holes

Please help me with identifying this setup, as i don't know what parts to order, I'm searching the net since a couple of days and have no idea, its actually my first Japanese motorcycle. The only experience i have is with vintage European bikes from 50ties, much less complicated. Thanks for any input.

Were they not fitted when you pulled the carbs?

JoHNY wrote: Were they not fitted when you pulled the carbs?

Yes, they were on the bike, all working. Except i noticed the rubbers what connect them to the airbox are hard as rock, and even didn't make a good seal to the airbox. Thats why i removed everything. I've already ordered rubber flanges between carburetors and the engine, but now i'm hoping i could cancel it, as they probably wouldn't fit too.
Unless 26mm and 31mm carbs have the same outer diameter at the engine side, and those rubber flanges are the same (?)

edit: i attached another picture with the carbs and the airbox installed. The airbox fits the frame perfectly, so either its from this model with its holes bored out to 52mm, to accommodate larger rubbers or came from another motorcycle along with the carbs..

If there are no cracks the rubber can be reconditioned with wintergreen, oil, armorall, pinesol, heat, etc. Save $200 if there are no cracks. R

rrsmsw9999 wrote: If there are no cracks the rubber can be reconditioned with wintergreen, oil, armorall, pinesol, heat, etc. Save $200 if there are no cracks. R

I've tried boiling metod in the past, indeed 60yr old rubber inlet became soft, but once it cooled down it
turned into even harder piece. I haven't tried other methods like soaking in chemicals, i live in Europe so products names are different, i heard Xylene paint thiner can be used. Anyway first of all i wish i knew what exactly do i have, if its from KZ750 then the carb-airbox boots i can get for $20each.
They look very similar to mines, maybe i'll just ask the store to meassure the exact dimensions.

If i don't find the new ones i'll try to seal old ones, with electrical selfadhesing tape at the airbox, and teflon tape where they clamp on the carbs.

I know it's not ideal but you could get some suitable diameter rubber tubing and make some?

I went from 28's to 33's. To use the KZ 900 air box I had to use radiator hose. I used pretty silicon hose but it got ugly within a month. Going back to rad hose.
Steve

Are you certain the carbs & airbox aren't stock? The GT550 wasn't sold in the USA, but a quick google search seems to show that the G3 came stock with cv carburetors. The new ducts in the photo are for the TK22 mechanical slide carbs found on most of the 80-83 KZ550 chain drive USA models (not the GPz H) & those ducts also fit the 77-80 KZ650s.
By 1983-on probably most Kawasakis had cv carburetors.

Ducts. The 83 KZ550-M1 Ltd shaft has an airbox & carbs that appear to be the same as yours.
Z1Enterprises.com has the airbox ducts. oem. part #14073-1083.
I'm not certain they are correct for the GT550. I'd guess yes, just a guess.

I understand unconventional installation, eg if factory parts are not available, or are astronomically expensive, but for eg those carb flanges at the engine side i've bought for $50, and thats way cheaper then from official Kawasaki store. They came, and fit perfectly to the carbs. I attached a picture with dimensions for future reference..

My carbs and airbox looks exactly like stock setup, and indeed they are Teikei CV carburetors. Except that they are supposed to be 26mm instead 31mm i measured, thats my confusion.

Ok, so these rubber ducts i got are just the wrong ones,not for my model, maybe i'll try to sell them.

And those ducts for 83 KZ550-M1 #14073-1083 you mentioned indeed looks exactly like my current ones! And i've just checked some local offers, and they seem to be available and are actually listed for my model GT550G3 in Kawasaki parts catalog, although internet stores list them for 83 KZ550 LTD, no wonder i haven't came across them.
I just need to confirm their diameter at the carb side. as they should be ~50mm

Thanks for your responses.

So one of the previous owner (there were must have put some different carbs (31mm) and airbox setup, since the stock carbs should be 26mm for this year model.


The early CV carb measurements are a funny one here, what we measure the ventuiri as 26mm /27mm actually are the same as the 30mm. Strange but true. I think the rubbers are different though?

Also then later model GT550 and zephyr 550 had a different carb spacing due to a revised cylinder head IIRC ...and Kehin CVK30 semi flatslide carbs.

Don't confuse your late model shaft CV carb for the earlier slide carb 70's z550...same name, very different bikes.

Thank you all for the replies.
I got new rubber ducts Part no: 14073-1083 which is for this particular model and they fit perfectly.

So my carbs indeed must be stock ones, its just the issue with measuring this venturi diameter, maybe its 26mm in the middle of the carburetor.