- Posts: 18
- Thank you received: 0
1976 KZ750B Mikuni jets
- Steve AZ
- Topic Author
- Offline
- User
What size jets?
Needle position?
Air mixture turns?
Oh, and I'm in Phoenix, maybe 1400 elevation.
Thanks!!
Phoenix, Az
1976 KZ750B1
1994 Moto Guzzi California 1100i
1971 Moto Guzzi ElDorado 850
Please Log in or Create an account to join the conversation.
- bountyhunter
- Offline
- User
- Posts: 7246
- Thank you received: 337
The pilot jet screws on the side of the carbs run about 2T out from all the way in.
I recommend buying a used air box it will probably save a lot of wasted time.
If you have the carbs torn down, check the diaphragms carefully for slits or air leaks. You have to hold them up to a light to see them. They will screw everything up.
1979 KZ-750 Twin
Please Log in or Create an account to join the conversation.
- trippmann
- Offline
- User
- Posts: 16
- Thank you received: 0
how does the bike run currently? if you dont have any idle issues i would leave the idle jet alone size wise. are you having flat spots in your power curve? if so, up the main jet to what you feel is right. the needle jet is going to take some playing around with. trial and error.
1978 kz650 C2, Full kerker exhaust, K&N drop in filter.
Please Log in or Create an account to join the conversation.
- Steve AZ
- Topic Author
- Offline
- User
- Posts: 18
- Thank you received: 0
Phoenix, Az
1976 KZ750B1
1994 Moto Guzzi California 1100i
1971 Moto Guzzi ElDorado 850
Please Log in or Create an account to join the conversation.
- Patton
- Offline
- KZr Legend
- Posts: 18640
- Thank you received: 2098
When cleaning the carb, would assure that orifices at top of carb bore are perfectly clean and clear so that the pilot circuit mixture can pass into the carb bore.
May spray carb cleaner through the various passageways to watch it exit through the orifices and into the bore.
The #8 pilot jet and #1 pilot air jet must be perfectly clean and clear.
And pointed tip of the #3 pilot screw must be undamaged and in serviceable condition.
An "as-new" pilot circuit should help enable a steady idle and strong pull-away from idle.
Memo -- This post is a revision, with thanks to 80B4 for reminding that BS38 Mikuni carbs are different from other Mikuni carbs.
Good Fortune!
1973 Z1
KZ900 LTD
Please Log in or Create an account to join the conversation.
- 80B4
- Offline
- User
- Posts: 447
- Thank you received: 105
1980B4 1000
1978 Z1R
1978 B3 750
Please Log in or Create an account to join the conversation.
- Steve AZ
- Topic Author
- Offline
- User
- Posts: 18
- Thank you received: 0
Phoenix, Az
1976 KZ750B1
1994 Moto Guzzi California 1100i
1971 Moto Guzzi ElDorado 850
Please Log in or Create an account to join the conversation.
- bountyhunter
- Offline
- User
- Posts: 7246
- Thank you received: 337
Steve AZ wrote: Ok, carbs had stock jets so even if the carbs were clean, the bike would be running lean. Where can I get the right jets for this carb, aren't they a little different than standard Mikunis?
I believe the pilot jets should be BS30-96 types which are widely available.
The mains are less available but one place is:
fourth item down:
www.allensperformance.co.uk/mikjets.html
Maybe somebody knows another source, that's the only one I have.
1979 KZ-750 Twin
Please Log in or Create an account to join the conversation.
- Kungfutoast
- Offline
- User
- Posts: 33
- Thank you received: 0
www.jetsrus.com/
'76 KZ750B Twin
Please Log in or Create an account to join the conversation.