SOHC.co.uk Forums > CB750
Acceleration Misfire
McCabe-Thiele (Ted):
I'm convinced that on my 500 air screw turning out makes it leaner.
I can't comment with any authority on your model of 750.
We need Bryan or Graham/Julie to say with certainty it might be useful to include your carb model type number that is cast on the flange end near the inlet manifold.
K2-K6:
--- Quote from: Saesneg Shaun on September 06, 2024, 10:51:35 PM ---OK so to be clear I need to turn the air screw IN to richen it a bit?
I'm thinking of getting a cheap Amazon temperature gun for checking the header temps. Anyone used one for this?
--- End quote ---
Yes, turn it IN for richer.
If you wanted to "guinea-pig" it .... then turn then to only 1/2 out total from closed and run it, then to 2 1/2 turns out and run it like that. Should answer the mixture question by showing what happens.
Nurse Julie:
--- Quote from: McCabe-Thiele (Ted) on September 06, 2024, 11:13:14 PM ---I'm convinced that on my 500 air screw turning out makes it leaner.
I can't comment with any authority on your model of 750.
We need Bryan or Graham/Julie to say with certainty it might be useful to include your carb model type number that is cast on the flange end near the inlet manifold.
--- End quote ---
It's an air screw on all Keihin CB SOHC 4'S carbs, except the Keihin PD carbs. Turn the screw in for less air = richer, turn the screw out for more air = leaner.
K2-K6:
As Julie notes ... they are called AIR SCREW ADJUSTMENT in original CB750 workshop manual.
Further ... the fault finding table in assisting diagnosis of idle problems is consistent in description of faults and detection with how we understand it here, that its adjustment of air in modulation to effect a change in mixture.
Martin6:
OK. I will follow that advice from now on. I'm sorry I took us off at a tangent. Thank you.
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