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Rebuilding KZ900 Mikuni's
- ubertalldude
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1 - The pilot mix screw is threaded in from the bottom of the carb assembly, down below the float. This does not match the diagram I see on partzilla and others. Is this indicative of a different carb? Will the stock air mix screw o-ring fit on this?
2 - I want to know if this is a full rundown of the rubber o-rings that need to be replaced (I plan to just deep clean the float and seat, and jets.)
- Pilot mix screw o-ring
- Bowl drain screw o-ring
- Choke plunger o-rings
Am I missing anything?
3 - Is there any consideration to tuning I need to make given that this bike was supposedly bored/sleeved out to 1000cc from the stock 900cc?
Outside of this I will do a bench sync and set the float height per the FSM, which I've acquired a digital copy of.
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- Nessism
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Cycleorings.com sells a cheap kit for VM's which are very useful. Not sure if every O-ring is the same but I think you will find some of the pieces useful.
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- Warren3200gt
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Mix screw o rings are not interchangable between fuel and air screws as they are different diameter.
Which vm26 do you have?
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- SWest
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- 10 22 2014
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Steve
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- zed1015
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Stock VM28's on the Kawasaki Z1R,Mk2,ST only had the air mix on the side and never a fuel mix on the underside.
VM26's and VM28's from Suzuki GS's have BOTH fuel and air mix screws.
AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
kzrider.com/forum/23-for-sale/611992-air-corrector-jets-
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- ubertalldude
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Either way, it seems like cycleorings.com has a great o-ring kit that includes the choke plunger, pilot air, pilot fuel, and bowl drain o-rings, which appears to be o-ring I need. I believe I also need the valve seat washer, as it seems like we lost one. Definitely need new fuel inlet tees and gaskets.
Any idea what an approximate stock setting on each of these screws would be? I typically figure 1.5 - 2 turns from seated, but have never dealt with independent pilot air and pilot fuel mix screws.
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- SWest
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- 10 22 2014
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Steve
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- hardrockminer
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In later years KHI added an accelerator pump on the carbs, usually on #2, and as well they went back to 28 mm outlets. Of all of the versions I like the '76 one best. It's the simplest to work on, although synch is a bit more difficult than the VM 28 SS version. I have a set of '76 version on my 1980 KZ1000 LTD. The bottom end is original. The top end is off a '78 KZ1000. This bike has a Z1 air intake and a V&H 4/1 exhaust. It runs very well and pulls hard with those carbs, particularly above 4,000 rpm.
I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.
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- ubertalldude
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hardrockminer wrote: The second, used in 1977 had the fuel/air screw hole blocked off and used pilot screw adjusters on the underside of the bowl near the front of the carb. (front meaning closest to the intake manifold when the carbs are mounted on the bike).
This sounds like my configuration. I'll have to verify the absence of the mix screws on the top/side (diagonal installation from what i can tell in the exploded diagrams) to be sure, but this is very helpful. Thank you
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