carb jeting

i have a set of vm28ss off of a 75 z1 900 im cleanig and going through i also have a set of 78 kz 1000 vm26ss that are said to have a jet kit in them/ main jet-112.5/pilot jet-15/valve set-2.3 any point of puting any of this stuff in the 28's im going to put the 28's on my 78 1000 ltd:unsure:

ironleg wrote:

i have a set of vm28ss off of a 75 z1 900 im cleanig and going through i also have a set of 78 kz 1000 vm26ss that are said to have a jet kit in them/ main jet-112.5/pilot jet-15/valve set-2.3 any point of puting any of this stuff in the 28's im going to put the 28's on my 78 1000 ltd:unsure:

Some carb info from Z1E:

28mm (VM28SC) Late Z1-A & all Z1-B
Main Jet 112.5
Air Jet 1.0
Needle Jet O-8
Jet Needle 5J9-2 (last number is the clip position)
Throttle valve (slide) 1.5mm cutaway
Pilot Jet 17.5
Air Screw setting 1 1/4 turns out

Good Luck!

FSM shows 1978 KZ1000-A2 carb specs:
VM26SS;
Main Jet 105R;
Needle Jet O-5/2;
Jet Needle 5DL31-3;
Pilot Jet 15;
Pilot Screw @ 1.0 turn out (+/- 1/.

Good Luck!

I just went through a set 0f 28 pumpers. I removed the pump. and put 26 carb bowls.

The carbs had 17/112. That seems a 26mm set up. I then installed 20/120. Just right. Thay is with pods and headers.

im not trying to beat a dead horse but if you go up in mainjet size do you also change the pilot jet also im going to have pods air filters and header

Ironleg, My experiance has been, stock Mikuni's are very forgiving w/pilots and needle heights for application, and Mains usually within a step or two unless major eng./exhaust mods. Be safe, but not ballistic, Mechanical Mikuni's of the era were mostly 26- 28mm bores and were air screw, fuel screw, or both. if idle speed can be affected within a turn of stock setting,per cyl, evaluate. If idle changes w/less, be happy, your' pilots are easily in range. luck G. side bar, In my opinion, float heights are more a tuning/jetting issue, than simply keeping gas in the carbs. attend them closely. worn divots at float arms are frequent causes of overflow/gas filled cases.

iirc, my 78 1000 ltd is running 20/117.5....i went up a pilot after my motor work and it was bog city.....i havent tried
the 117.5 on the street yet as it is a winter wonderland here ......seems to be o k for getting it running and i have to get new throttle cables as the motion pros i have are not cutting it...i have nos cables coming and i should be able to dial it in a little more once they show up....

Not posative but I believe Z1 pilot jets wont work in later 26s & vise versa. Correct me if Im wrong.