Carb Jetting

  • ed spangler
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14 Nov 2011 18:14 #488471 by ed spangler
Carb Jetting was created by ed spangler
Please take a look at the pipes as they were on this bike before we started work on it and the after pic, look at how the pipes that were on it to begin with are not dark Blue and the Mac 4 n 2 we put on it are dark Blue. Bike runs OK but am thinking that carbs may need to be richened up a little.
Yeah BTW, that really is the same bike.
Thoughts on the jetting anyone?
ED

Have 1975 Kawasaki Z1-B & 2003 Harley Davidson Heritage Softail Classic
Had Hondas, Harleys and many ,many Z Series Kaws both Std. & LTD's
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15 Nov 2011 01:22 - 15 Nov 2011 01:25 #488534 by Patton
Replied by Patton on topic Carb Jetting

ed spangler wrote: Please take a look at the pipes as they were on this bike before we started work on it and the after pic, look at how the pipes that were on it to begin with are not dark Blue and the Mac 4 n 2 we put on it are dark Blue. Bike runs OK but am thinking that carbs may need to be richened up a little.
Yeah BTW, that really is the same bike.
Thoughts on the jetting anyone?
ED

Should be rightfully proud of the beautiful, quality restoration. :cheer:

Perhaps the former header pipes were stock double-walled which aren't as prone to coloring.

Before addressing the carbs, should assure valve clearances are within specs, and ignition timing is correct, and replace spark plugs with brand new NGKB8ES.

Would return carbs to stock settings, and proceed with tuning from there, beginning with sync and pilot air screw adjustments.

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 Fortune! :)

1973 Z1
KZ900 LTD
Last edit: 15 Nov 2011 01:25 by Patton.

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15 Nov 2011 12:03 #488583 by Boostable
Replied by Boostable on topic Carb Jetting

Patton wrote:

ed spangler wrote: Please take a look at the pipes as they were on this bike before we started work on it and the after pic, look at how the pipes that were on it to begin with are not dark Blue and the Mac 4 n 2 we put on it are dark Blue. Bike runs OK but am thinking that carbs may need to be richened up a little.
Yeah BTW, that really is the same bike.
Thoughts on the jetting anyone?
ED

Should be rightfully proud of the beautiful, quality restoration. :cheer:

Perhaps the former header pipes were stock double-walled which aren't as prone to coloring.

Before addressing the carbs, should assure valve clearances are within specs, and ignition timing is correct, and replace spark plugs with brand new NGKB8ES.

Would return carbs to stock settings, and proceed with tuning from there, beginning with sync and pilot air screw adjustments.

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 Fortune! :)


Patton,

Do you have a link to Z1E with this information? I can't seem to find it on the site.

~Jack

1982 KZ1000 J2 ~ Project (Street Fighter - Project Section)
1976 KZ900 - Daily Rider

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15 Nov 2011 12:08 #488584 by Boostable
Replied by Boostable on topic Carb Jetting
Never mind.. got it.. :)

~Jack

1982 KZ1000 J2 ~ Project (Street Fighter - Project Section)
1976 KZ900 - Daily Rider

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15 Nov 2011 12:45 #488592 by Patton
Replied by Patton on topic Carb Jetting
For others that might need a hand toward finding the excellent carb info furnished by Z1 Enterprises:







Good Fortune! :)

1973 Z1
KZ900 LTD
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