- Posts: 91
- Thank you received: 0
cv 34 question
- kzbobber1
- Topic Author
- Offline
- User
Please Log in or Create an account to join the conversation.
- kz750saskatoon
- Offline
- User
- Posts: 112
- Thank you received: 2
-Float level is a different setting from what you adjust with the vacuum gauges. The float level adjusts how much fuel is in the bowl. The vacuum gauges are used to finely adjust and synchronize the throttle plates to one another. The float level is set by bending the little metal tine that the float needle hangs from and is checked using the clear tube method (use the search function on the forum to find it).
-What is it doing that makes you think its getting too much fuel? Popping sounds from the exhaust? Or just from the high idle?
-Are you running stock exhaust? Jetting may need to be changed if not.
-All sorts of funny things can happen with the airbox off. Someone else will have to comment on if it would make the mixture too rich. My initially guess would be that should make it too lean?
-There are two things you can try. First, underneath the carbs, between the middle two, there is a knurled screw that you can screw/unscrew to change how open the throttle plates are. This will affect your idle speed.
-The other thing, which you mentioned, is adjusting the idle mixture (a.k.a. pilot mixture) screws. If you look down at the top of the carbs, you'll see a single brass screw on each carb body. These adjust the air/fuel ratio at idle. Turning the screw IN (clockwise looking at the screw) will reduce the amount of fuel (mixture is more lean). Turning the screw OUT (counter-clockwise looking at the screw) will increase the amount of fuel (mixture is more rich). If you try this, you want to turn yours in.
-The factory spec for the screws is stated as "Two turns out from lightly seated"
-As far as running without the airbox, I have seen some people suggest cutting a piece of cardboard or hard plastic and placing it over the air intakes of the carbs to simulate the resistance the airbox induces. Someone else will have to describe that in more detail to you though.
1981 KZ750-H2
Saskatoon, SK
Please Log in or Create an account to join the conversation.
- apbling
- Offline
- User
- Posts: 999
- Thank you received: 12
I'd also make sure your electrical systems are up to snuff and that you check your valve clearances.
Please Log in or Create an account to join the conversation.
- TeK9iNe
- Offline
- User
- What did you do!?!
- Posts: 2440
- Thank you received: 28
It can save you seasons of headaches and torture, and $$$.
If you have not changed the carburetor jetting, and you have the origional air filter/air box, carbs, exhaust, then basically everything just needs to be air tight, and set to defaults and the bike should run great.
Motorcycle Shop Owner/Operator
79 Kawie Z1000 LTD
81 Kawie Z1000 CSR
83 Honda VT750C A
85 Kawie GPZ900 A2
86 Zukie GS1150 EG
93 Yamie XV1100 E
Lucky to have rolled many old bikes through my doors
Please Log in or Create an account to join the conversation.
- kzbobber1
- Topic Author
- Offline
- User
- Posts: 91
- Thank you received: 0
Please Log in or Create an account to join the conversation.
- JR
- Offline
- Sustaining Member
- Posts: 2940
- Thank you received: 449
it seems like the number 2 carb is pumping out too much fuel. I think maybe I dont have the float in that one adjusted right
Excuse my dumb question but do you mean the # 2 carb is leaking out the nipple on the bottom of the float bowl ?
....or that your spark plug is black from to much fuel ?
Either could be caused by to high a fuel level in the bowl and this can be checked using the clear tube method - do a search for clear tube method and you will find lots of posts.
A leak out the bottom of the float bowl could also be caused by bad float needle valve or dirt or cracked overflow tube.
1980 kz750E1, Delkevic exhaust
Please Log in or Create an account to join the conversation.
- kzbobber1
- Topic Author
- Offline
- User
- Posts: 91
- Thank you received: 0
Please Log in or Create an account to join the conversation.
- apbling
- Offline
- User
- Posts: 999
- Thank you received: 12
Please Log in or Create an account to join the conversation.
- Polar_Bus
- Offline
- User
- Posts: 256
- Thank you received: 7
it does leak out of the overflow nipple on the bottom of the bowl. When I block it off with a tube it then wants to come out through the carb itself. a small puddle forms in the carb. I think it is just adjusted too high. I will try and adjust and see what happens. thanks
Or that carb has a worn and or dirty fuel inlet needle/seat assembly. In most cases when you have a high idle that can't be adjuster down, that an air leak or a very lean pilot/air screw circut. Like others commented, I am also very surprised that engine even starts and runs with stock jetting and no airbox.
Bikes:
'84 GPz1100
'06 HD Fatboy
Please Log in or Create an account to join the conversation.