1. After 20+ years it's time to pass the torch. If you are interested in acquiring this forum please contact support@cv-performance.com for details. Any spam will be reported and blocked.
  2. Welcome to Bike Talk, a forum for all bikers and motorcycle enthusiasts. If you are new to Bike Talk, be sure to register for free and join the conversation.

    There's always someone around willing to help out with questions or give a friendly wave back. All Harley and metric riders are welcome.
Bike Talk Motorcycle Forum is For Sale Welcome to Bike Talk

Idling High

Discussion in 'Motorcycle Tech Talk' started by Nerodemus, Nov 3, 2005.

  1. Nerodemus

    Nerodemus New Member

    Joined:
    Jul 20, 2005
    Messages:
    4
    Likes Received:
    0
    I drive a 73 Honda CB 750.
    And as of lately it has been idling high. it will start at 1200 rpm and increase up to 3000 rpm.

    What could be the cause of this? I'd like to do the job myself instead of bringing the bike in.
    Nerodemus, Nov 3, 2005
    #1
  3. Killer-B

    Killer-B New Member

    Joined:
    Jan 22, 2005
    Messages:
    841
    Likes Received:
    0
    Make sure your choke is disengaging all the way.
    Make sure your timing has not changed on you.
    Check throttle-cables for binding.
    When was the last time the carburetors were synchronized ?
    Killer-B, Nov 3, 2005
    #2
  4. Nerodemus

    Nerodemus New Member

    Joined:
    Jul 20, 2005
    Messages:
    4
    Likes Received:
    0
    I got a mechanic to check the synch and he says it sounds fine.
    I will look at the binding issue.
    Nerodemus, Nov 3, 2005
    #3
  5. Killer-B

    Killer-B New Member

    Joined:
    Jan 22, 2005
    Messages:
    841
    Likes Received:
    0
    ALSO, check the return spring strength, it might be no longer adequate, or just plain streched out...
    Killer-B, Nov 3, 2005
    #4
  6. chucktx

    chucktx Moderator Staff Member

    Joined:
    Jul 5, 2005
    Messages:
    12,545
    Likes Received:
    10
    a leaky intake will cause the idling problem also. could be as the engine warms up, the leak gets a bit bigger, and as it cools off it gets smaller. just a thought
    chuck
    chucktx, Nov 3, 2005
    #5
  7. 00 wildglide

    00 wildglide New Member

    Joined:
    Nov 5, 2005
    Messages:
    193
    Likes Received:
    0
    Location:
    ca.
    high idle

    Make sure your choke&cable going to it are functioning properly.Another thing to check is the float levels(a little more involved)--could possibly be too high.Sorry I should have mentioned the throttle cable also.As with anything mechanical check all easy to get at stuff first.Sometimes on older bikes the throttle shafts running through the carbs. body become worn & hang up...causing idle speeds to not return to normal.good luck!!!!!!
    00 wildglide, Nov 6, 2005
    #6
  8. Nerodemus

    Nerodemus New Member

    Joined:
    Jul 20, 2005
    Messages:
    4
    Likes Received:
    0
    Thanks again.
    I will check this out.
    Nerodemus, Nov 7, 2005
    #7

Share This Page

XenPorta © Jason Axelrod from 8WAYRUN.COM