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high idle

  1. Z

    1980 CB750 Runaway Idle

    Hey guys, I have a 1980 CB750k that I bought for very cheap as a project bike. This is my first bike so everything is new and a learning experience. So let's get to the point of why I am making this post (I've tried researching all over before making this post). Essentially I have got the bike...
  2. T

    1980 CB750F Oil light On/High and Erratic Idle

    Hey Guys looking at for some insight on some issues that I am having with the bike I just bought. So I bought the bike running took it for a spin upon purchasing it runs great the idle does sit high at 2,000 RPM when warm. The bike does not idle when cold, the bike starts right up though but I...
  3. P

    How does the choke work on this bike?

    When I pull up on the choke, the butterflies close and it idles higher. Push the choke down, the butterflies open, and it idles lower. This makes no sense to me. As a side note, the bike already idles too high (4500-5000) so I know the carbs need tuned bad. I’m just confused as to how...
  4. L

    Help with High Idle at Start CB750K 1981 DOHC

    I took the carbs off the bike to bench sync them, put them back on and now the bike is starting up at 5,000 rpm + and it won’t go down, choke is off. I was afraid of letting it run cold on such high rev, max time was 30 seconds and it won't go done. When I killed the engine some type of...
  5. D

    First bike. High idle issues.

    So, I have an 82' 750c that i just rebuilt the carbs on. i got everything put back together after following this PDF https://www.cb750c.com/publicdocs/SeanG/Honda_Carb_Manual_revG.pdf after re-attaching the carbs to the bike, and starting it, the bike idled at 4k. adjusting the pilots screws...
  6. deeveeance

    82 CB750C - High Idle after touching throttle, no spawn of satan?

    Hey all, I received the replacement set of carbs from eBay, cannibalized the original set and set up the new one on the bike. Fired up instantly, few pops, but smoothed out after adjusting the rod with black knob at the "bottom" of the carbs (idle screw?). Problem is, when I touch the...
  7. C

    Hanging throttle/high idle

    Edit: originally posted this in SOHC carb thread by mistake - not sure how to remove that post. Hello all! I have been racking my brains on a recently purchased 1981 CB750K, with the VB42 carburetor set up; original air box and original breather tubes. The bike was sold to me in 'as is'...