- Posts: 179
- Thank you received: 0
low rpm surging?
- asevans
- Topic Author
- Offline
- User
1976 kz900 Mostly stock
1978 Z1-R Project
Please Log in or Create an account to join the conversation.
- otakar
- Offline
- User
74 Z1-A stock
76 KZ-900 Totaly stock vice MAC pipe
77 KZ-1000A stock
78 Z1-R 100%MINT 500 original Mi.
78 Z1-R Yoshi 1103 kit stage 1 cams Yoshi pipe. Etc
79 KZ-1300 (1400)
80 KZ-1300
81 Scratch built GPz1150R
82 KZ1000
Please Log in or Create an account to join the conversation.
- bountyhunter
- Offline
- User
- Posts: 7246
- Thank you received: 337
1979 KZ-750 Twin
Please Log in or Create an account to join the conversation.
- Patton
- Offline
- KZr Legend
- Posts: 18640
- Thank you received: 2098
Hi. KZ900 header and pods. 120 mains. 20 pilot.moved the needle up one notch, so it is the fourth notch up. factory is in the middle i believe. brand new inline fuel filter. ok question. i'v got low range surging. just when im starting from a stop. it hesitates a little.when i cruise low rpms slow it surges. half throttle and wot are great. also when is start it up it doesnt start like it did before i switched my jets. i cant tell if im getting to much gas or not enough. ive been messing with my throttle when i start it. is this pilot or fuel levels maybe? im thinking its got to be carbs.
Oem KZ900 carb is 26mm Mikuni manual slide with side located pilot air adjustment screw.
Jet needle has five clip positions. Oem clip position is middle.
Moving the needle "up one notch" is usually interpreted as raising the needle so as to enrichen the mid-range. This would mean moving the clip one position down closer to the tapered (pointed) end of the needle.
Could experiment by adding a little choke during the surging.
If performance improves with choke added, something is causing a too lean condition.
If surging worsens with choke added, something is causing a too rich condition.
The oem KZ900 26mm carbs are very user-friendly, and may do just fine with jet needle clip in the oem middle position.
Good Fortune!
1973 Z1
KZ900 LTD
Please Log in or Create an account to join the conversation.
- otakar
- Offline
- User
74 Z1-A stock
76 KZ-900 Totaly stock vice MAC pipe
77 KZ-1000A stock
78 Z1-R 100%MINT 500 original Mi.
78 Z1-R Yoshi 1103 kit stage 1 cams Yoshi pipe. Etc
79 KZ-1300 (1400)
80 KZ-1300
81 Scratch built GPz1150R
82 KZ1000
Please Log in or Create an account to join the conversation.
- asevans
- Topic Author
- Offline
- User
- Posts: 179
- Thank you received: 0
1976 kz900 Mostly stock
1978 Z1-R Project
Please Log in or Create an account to join the conversation.
- Patton
- Offline
- KZr Legend
- Posts: 18640
- Thank you received: 2098
when i mess with my air screws its hard to notice any change. they do cause a reaction when i turn them in. like the manual says. but as far as finding the right setting, it is hard. right now they are 1 1/2 turns out.
when i mess with my air screws its hard to notice any change. - - - This may result from imperfectly cleaned passages in the carb pilot circuit.
Good Fortune!
[Click on image to enhance view.]
Wear protective goggles while using carb cleaner spray.
1973 Z1
KZ900 LTD
Please Log in or Create an account to join the conversation.