1972 CB350K4 Won't Idle - Page 3
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Thread: 1972 CB350K4 Won't Idle

  1. #21
    Member barab63's Avatar
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    Thank you for the explanation. Regarding my mechanic: he came recommended and has tuned up my CB750 and CX500, both still running great. But we are human. After I got the 350 home and realized it wouldn't idle properly, I examined the bike and found the throttle cables out of sync. I didn't mess with the idle speed until I ran the bike again yesterday and still had the issue. We have another nice day here so I'll change the idle speed and see how it goes. Thanks again for your help. I know you've shared your knowledge with many people on this forum, which I think speaks to your character.

    John
    Current projects 1972 CB350K4, 1969 CB750. Road worthy bikes: 1973 CB750K3, 1980 CX500, 2015 Triumph Trophy SE

  2. #22
    Senior Member doode's Avatar
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    As Steve mentioned, 1,200 is correct for idle.
    Another thing to consider is if the oil pump can work efficiently below 1,200. Lower rpm may compromise flow to the top end.
    Rscottp likes this.

  3. #23
    Member barab63's Avatar
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    Good point. Thank you for the feedback. Today I upped the idle, but hard to say to what. Before starting the engine, I turned both idle screws CW about 1/8 turn. Rode the bike for 10 minutes, got everything hot. Checked the idle and it was about 1000. (I keep saying "about" because no matter where I set the idle, the rpm swings down and up.). I turned the screws CW again another 1/8 to about 1200 and it idled there a bit. Afterwards pulled the plugs and they were carbon black. I think this means the fuel/air mixture is too rich?

    The carb has an air or fuel adjustment screw? What effect does Turning it in CW have?
    Current projects 1972 CB350K4, 1969 CB750. Road worthy bikes: 1973 CB750K3, 1980 CX500, 2015 Triumph Trophy SE

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  5. #24
    Senior Member doode's Avatar
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    Fuel screw. Turning it CW (in) leans it.
    I set mine around 1 full turn out as a starting point and adjust from there

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