CB72 carb problems

Rivera

New Member
Joined
Dec 29, 2024
Total Posts
3
Total likes
2
Location
Ravensburg, Germany
Hello,
I got a 1965 CB72 restored. I cleaned the carbs in the ultrasonic new needles jets etc. I checked the parallel moving of the floatsetc.
I can´t achieve a decent idle. I also started with the floats bottomed out and the air screw 3/4 turns out.
I warmend up the engine to adjust the idle without a good result. When I turn in the float adjusting screws the floats only lift up minimally.
To get an idle at all I have to turn out the cable adjuster of the gas cable leading from the twist grip to the splitter.
The floats are then almost half open.
What is wrong?
Do you have a picture of your float opening after you adjusted the idle?
Any help is appreciated.
Regard
Uli Hoffmann
Ravensburg
Germany
 
Uli,
Just a quick question, prior to the carburetor adjustments, did you verify/adjust the valve clearance and check the static timing?

My .02,
Uli-
 
Rivera said:
Hello,
I got a 1965 CB72 restored. I cleaned the carbs in the ultrasonic new needles jets etc. I checked the parallel moving of the floatsetc.
I can´t achieve a decent idle. I also started with the floats bottomed out and the air screw 3/4 turns out.
I warmend up the engine to adjust the idle without a good result. When I turn in the float adjusting screws the floats only lift up minimally.
To get an idle at all I have to turn out the cable adjuster of the gas cable leading from the twist grip to the splitter.
The floats are then almost half open.
What is wrong?
Do you have a picture of your float opening after you adjusted the idle?
Any help is appreciated.
Regard
Uli Hoffmann
Ravensburg
Germany
Click to expand...
3/4 of a turn out, on the air screws, sounds really rich. 1 1/4 to 1 1/2 turns out should be more like it.
 
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