Mikuni VM26SS fuel mixture or air mixture screw? Which is it?

kevski
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Re: Mikuni VM26SS fuel mixture or air mixture screw? Which is it?

03 Oct 2020 13:21 - 04 Oct 2020 01:08

jonnydirt2 wrote: I know i am sorry i even looked at this post for help now...

As you have the carbs with the screw underneath, don't worry about other types, screws should be around 1 an 1/4 turns out, this is about right for the pilot circuit, to slightly richen screws go out, to weaken turn in slightly. This does not richen and weaken through the whole rev range.

Last edit: 04 Oct 2020 01:08 by kevski.

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Mikaw
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Re: Mikuni VM26SS fuel mixture or air mixture screw? Which is it?

03 Oct 2020 17:54

#836115

kevski wrote: As you have the carbs with the screw underneath, don't worry about other types, screws should be around 1 an 1/4 turns out, this is about right for the pilot circuit, to slightly richen screws go in, to weaken turn out slightly.

Huh???

1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

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krazee1
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Re: Mikuni VM26SS fuel mixture or air mixture screw? Which is it?

03 Oct 2020 21:23

#836118

kevski wrote:

jonnydirt2 wrote: I know i am sorry i even looked at this post for help now...

As you have the carbs with the screw underneath, don't worry about other types, screws should be around 1 an 1/4 turns out, this is about right for the pilot circuit, to slightly richen screws go in, to weaken turn out slightly. This does not richen and weaken through the whole rev range.

"Here's the deal" (famous J.B. quote), it looks to me like this subject was well explained, with diagrams even, and then you go and post this. Are you TRYING to drive the O.P. batsh#t crazy?

Attempt at humor, please accept as such Mike

Former M.E. at Kawasaki Motors Manufacturing, Lincoln, NE
1966 W1 (the Z1 of 1966-50H.P. and 100mph!)
1974 Z1
1978 KZ1000 LTD
1976 KZ900B pile O parts
1980 KZ750E
1980 Honda XL250S (I know, wrong flavor!)

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kevski
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Re: Mikuni VM26SS fuel mixture or air mixture screw? Which is it?

04 Oct 2020 01:05

#836123

krazee1 wrote:

kevski wrote:

jonnydirt2 wrote: I know i am sorry i even looked at this post for help now...

K.I.S.S.
As you have the carbs with the screw underneath, don't worry about other types, screws should be around 1 an 1/4 turns out, this is about right for the pilot circuit, to slightly richen screws go in, to weaken turn out slightly. This does not richen and weaken through the whole rev range.

"Here's the deal" (famous J.B. quote), it looks to me like this subject was well explained, with diagrams even, and then you go and post this. Are you TRYING to drive the O.P. batsh#t crazy?

Attempt at humor, please accept as such Mike

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zed1015
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Re: Mikuni VM26SS fuel mixture or air mixture screw? Which is it?

04 Oct 2020 01:52 - 04 Oct 2020 01:57

#836125

kevski wrote: This does not richen and weaken through the whole rev range.

To be strictly accurate it does although hardly noticeable as a percentage.
Overall fueling is a stack up of all the circuits put together so any increase or decrease in fuel metered by the pilot screw will be added or subtracted from the total amount received elsewhere.

AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
www.kzrider.com/23-for-sale/611992-air-c...lide-mikunis?start=0

Last edit: 04 Oct 2020 01:57 by zed1015.

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krazee1
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Re: Mikuni VM26SS fuel mixture or air mixture screw? Which is it?

04 Oct 2020 06:06

#836132

To be strictly accurate, increase or decrease in the fuel and air MIXTURE metered by the pilot screw.

Former M.E. at Kawasaki Motors Manufacturing, Lincoln, NE
1966 W1 (the Z1 of 1966-50H.P. and 100mph!)
1974 Z1
1978 KZ1000 LTD
1976 KZ900B pile O parts
1980 KZ750E
1980 Honda XL250S (I know, wrong flavor!)

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krazee1
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Re: Mikuni VM26SS fuel mixture or air mixture screw? Which is it?

04 Oct 2020 06:13

#836133

K.I.S.S. is a good theory, but your advice is off 180 degrees. The air/fuel mixture screw on the bottom of the carbs is turned OUT to richen, (more fuel and air) and IN (less fuel and air) to lean the idle circuit.

Mike

Former M.E. at Kawasaki Motors Manufacturing, Lincoln, NE
1966 W1 (the Z1 of 1966-50H.P. and 100mph!)
1974 Z1
1978 KZ1000 LTD
1976 KZ900B pile O parts
1980 KZ750E
1980 Honda XL250S (I know, wrong flavor!)

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kevski
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Re: Mikuni VM26SS fuel mixture or air mixture screw? Which is it?

04 Oct 2020 06:18

#836134

krazee1 wrote: K.I.S.S. is a good theory, but your advice is off 180 degrees. The air/fuel mixture screw on the bottom of the carbs is turned OUT to richen, (more fuel and air) and IN (less fuel and air) to lean the idle circuit.

Mike

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Rick H.
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Re: Mikuni VM26SS fuel mixture or air mixture screw? Which is it?

04 Oct 2020 13:23

#836152

Dang! and here I thought I FINALLY figured out why my bike wasn't running quite right. Oh well back to the drawing board....
Rick H.

Rick H.

1977 Kawasaki KZ-1000A1

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Mikaw
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Re: Mikuni VM26SS fuel mixture or air mixture screw? Which is it?

04 Oct 2020 19:54

#836182

Maybe this is a good time when the OP hasn't been back in a while. He missed all the Bats@#t crazy stuff.

1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

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kevski
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Re: Mikuni VM26SS fuel mixture or air mixture screw? Which is it?

05 Oct 2020 00:01

#836185

Mikaw wrote: Maybe this is a good time when the OP hasn't been back in a while. He missed all the Bats@#t crazy stuff.

He probably thought f*#k it I only wanted a quick answer and not the coefficient drag factor of an issosiles triangle while eating a doughnut in the springtime.:laugh:

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Mikaw
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Re: Mikuni VM26SS fuel mixture or air mixture screw? Which is it?

05 Oct 2020 07:35

#836196

kevski wrote:

Mikaw wrote: Maybe this is a good time when the OP hasn't been back in a while. He missed all the Bats@#t crazy stuff.

He probably thought f*#k it I only wanted a quick answer and not the coefficient drag factor of an issosiles triangle while eating a doughnut in the springtime.:laugh:

:laugh: :silly:

1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

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