Results 1 to 4 of 4
  1. #1
    Member
    Join Date
    Nov 2004
    Location
    Columbus, Indiana
    Posts
    4,247

    OX66 idle speed issue.

    2004 250hp OX66. When I first start up, it seems to idle too fast.. About 1100 rpm. Clunks pretty hard when going into gear. After it warms up, then it idles right at 750 in gear. If I turn the idle screw down to where it idles good at startup, then after it warms up, it idles at about 500 rpm in gear and chugs a little. Have to stay on the throttle to keep rpms up. High idle is primarily on on first start-up and really bad when the weather is colder. Makes a little hard to get around in the morning when idled up at tournament launch. Any suggestions on where to start looking. Manual does not have a troubleshooting tree for this issue.

  2. Moderator 21XDC's Avatar
    Join Date
    Sep 2004
    Location
    Westland Michigan
    Posts
    65,330
    #2

    Re: OX66 idle speed issue. (201pro)

    Mine does the same thing, so I let mine warm up some first. I thought about disconecting the "N" safety switch and start it in gear.

    Marks Props 317-398-9294, 1850 East 225 South, Shelbyville, Indiana 46176 propellerman59@gmail.com http://www.marksprops.com/index.html

  3. NC Bass Club/Yamaha Motors Moderator BuzzB8's Avatar
    Join Date
    Jun 2004
    Location
    Asheboro, NC
    Posts
    7,090
    #3

    Re: OX66 idle speed issue. (201pro)

    Russ, it's doing just what it's supposed to do. I always let it warm up until it kicks down the idle before I do anything. I even try not to put it in gear, sometimes using the TM to get around until all is warm.

  4. Member
    Join Date
    Nov 2004
    Location
    Columbus, Indiana
    Posts
    4,247
    #4

    Re: OX66 idle speed issue. (BuzzB8)

    That cannot happen around here during my tournaments. If I launch in the Ohio river with river current and boats behind me, I have to be able to get it started and in gear asap. Also very small ramps, so sitting on the trailer waiting to warm up is not an option. I do not remember it being this bad before, just started doing this this year.

Similar Threads

  1. Alarm at idle?? 250 ox66
    By Bryton623 in forum Yamaha Motors
    Replies: 4
    Last Post: 03-31-2011, 06:21 PM
  2. cold idle on ox66
    By viking in forum Yamaha Motors
    Replies: 9
    Last Post: 12-12-2009, 03:33 PM
  3. How to adjust idle speed on 225 OX66??
    By slapshot in forum Yamaha Motors
    Replies: 1
    Last Post: 05-15-2009, 07:55 AM
  4. plug gap and idle speed thoughts on 200 ox66
    By flatstick in forum Yamaha Motors
    Replies: 3
    Last Post: 10-02-2006, 11:41 AM
  5. OX66 225 Erratic Idle
    By ricostreet in forum Yamaha Motors
    Replies: 7
    Last Post: 06-30-2006, 03:36 PM