Welcome, Guest
Username: Password: Remember me
  • Page:
  • 1

TOPIC: Main Jet Size Relationship To Jet Needle Position

Main Jet Size Relationship To Jet Needle Position 26 Mar 2020 08:05 #821807

  • daveo
  • daveo's Avatar Topic Author
  • Offline
  • Expert Boarder
  • Expert Boarder
  • Posts: 2062
  • Thank you received: 298
Trying to grasp the needle-clip position relationship between two Main Jet sizes.

Do I have a 115 when the clip is in the top slot, and a 117.5 with the clip in the bottom slot, and essentially a 116.25 if the clip is in the middle?

:blink:
1982 KZ1100A-2 (sort-of)
1135 since 10/25/19
January 2016 BOTM

Please Log in or Create an account to join the conversation.

Main Jet Size Relationship To Jet Needle Position 26 Mar 2020 08:26 #821808

  • SWest
  • SWest's Avatar
  • Offline
  • Moderator
  • Moderator
  • Posts: 19462
  • Thank you received: 1895
It's mainly for altitude changes. I doubt it would cover that large a jump just like the pilot air screw. I think you'd have better luck with the main air/bleed jets.
Steve
Z1b1000 1975 Z1b
Opinions expressed by me do not reflect those of the the staff or members
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229
The following user(s) said Thank You: daveo

Please Log in or Create an account to join the conversation.

Main Jet Size Relationship To Jet Needle Position 26 Mar 2020 10:15 #821817

  • zed1015
  • zed1015's Avatar
  • Offline
  • Member
  • Member
  • Posts: 1759
  • Thank you received: 665
The size of the main is the size of the main, nothing will change that.
The needle is a metering device and the taper controls the rate of fuel feed at a particular throttle opening.
Lifting or lowering the needle only allows small changes to increase or decrease that feed to fine tune the mix.
The following user(s) said Thank You: daveo, Gdizard

Please Log in or Create an account to join the conversation.

Main Jet Size Relationship To Jet Needle Position 26 Mar 2020 10:40 #821818

  • gd4now
  • gd4now's Avatar
  • Offline
  • Member
  • Member
  • Denco where did you go?
  • Posts: 625
  • Thank you received: 86
Not sure if this will help or not but here is a page from a mikuni carb manual that shows the change in fuel flow between the slots.
1977 KZ650 B1
Pods and Denco header


This is my Z

OLD KAW OWNERS SMILE ALOT
Attachments:
The following user(s) said Thank You: daveo

Please Log in or Create an account to join the conversation.

Main Jet Size Relationship To Jet Needle Position 26 Mar 2020 11:00 #821822

  • daveo
  • daveo's Avatar Topic Author
  • Offline
  • Expert Boarder
  • Expert Boarder
  • Posts: 2062
  • Thank you received: 298
Very helpful information guy's. I think my jetting is close, if not dead on for the present cool weather conditions.
Amazing how one minuscule jetting change can detrimentally alter things.

:huh:
1982 KZ1100A-2 (sort-of)
1135 since 10/25/19
January 2016 BOTM
The following user(s) said Thank You: SWest

Please Log in or Create an account to join the conversation.

  • Page:
  • 1
Powered by Kunena Forum