SOHC.co.uk Forums > CB750
Acceleration Misfire
McCabe-Thiele (Ted):
There is an old post on this problem by Johnwebly? - turned out to be a couple of loose wires on the Boyer unit. I can't post the link using my phone but it's there if you search the term Boyer.
K2-K6:
--- Quote from: Saesneg Shaun on September 05, 2024, 10:05:50 AM ---Thanks all, i'll try turning the screws in to richten it up a bit. I was told too lean and the revs hang when I blip the throttle and too rich revs will bog down then recover. I'm running the stock airbox & filter and the advance mech is replaced with the boyer kit.
--- End quote ---
It sounds like the needle and main jet settings are substantially in correct range, as that's more the influence on plug colour from decent running.
If it just gets a little lean as you open the throttle slides, that suggests a deficit in slow speed circuit to stoke it up into response. The air screw adjustment should show if that's true or not.
In essence, if it does clean it up, then that suggests it's "asking" for a step up in volume of idle jet to bring it in competent range, at which point the airscrew set point would look more normal in comparison to manual.
Interesting to see if that tweak will show any desirable response.
McCabe-Thiele (Ted):
It's a long shot this is the link about a Boyer wiring issue.
.http://www.sohc.co.uk/index.php/topic,5861.msg29390.html#msg29390
Saesneg Shaun:
--- Quote from: McCabe-Thiele (Ted) on September 05, 2024, 12:02:43 PM ---It's a long shot this is the link about a Boyer wiring issue.
.http://www.sohc.co.uk/index.php/topic,5861.msg29390.html#msg29390
--- End quote ---
Thanks Ted. I will take a look tomorrow. Unfortunately the predicted monsoon arrived today so I didn't get to play with the bike.
Martin6:
If it's a 750K6, @Hondaman on the sister US SOHC4 forum, has explained a few times that turning in the idle screw weakens the mixture, as it isn't an air screw, it is metering the flow of already mixed air/fuel. So unscrew to richen.
It still feels alien to me (I'm more used to Amal carbs). But, that's his advice.
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