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Thread: 300ex sputtering in 5th

  1. #1
    Join Date
    Jan 2005
    Location
    Ohio
    Posts
    31

    Any Suggestions?

    my brother has a 93 300ex that sputters when shifted into 5th gear. it never does it at any other gear or rpm. it has good gas in it, the choke is NOT on either. i cleaned the carb, put another carb on it, changed the cdi box, cleaned air filter, changed coil, plug, and the little box on the left side of the front between the cdi and the coil, i am not sure what it is though. changed gas tank and made sure all vents and gas line was open. oh also it is stock jetting, and all the parts that were changed was off another 93 300ex that is in good running condition and still runs good with all those parts on it that were swithed. does anyone have any idea where to go from here? sorry this is so long.

  2. #2
    Join Date
    Jan 2005
    Location
    Ohio
    Posts
    31
    anyone have any suggestions

  3. #3
    Join Date
    Jan 2005
    Location
    Indiana
    Posts
    846
    If it's when he's trying to run wide open in fifth, then it's called a rev-limiter. Get an aftermarket CDI. Sparks racing sells one.

  4. #4
    Join Date
    Apr 2002
    Location
    clarksville, TN
    Posts
    6,054
    check your stator, mine came loose and made the quad sputter and run horrible.
    Planning a comeback...

  5. #5
    Join Date
    Jan 2005
    Location
    Ohio
    Posts
    31
    ill try the stator first and if that doesnt work ill look into a sparks rev-limiter. thanks guys. ill try the stator and post my results
    would either of you guys know what that little box is between the cdi and the coil is? it is fastened to the frame by a rubber sleeve

  6. #6
    Join Date
    Apr 2002
    Location
    clarksville, TN
    Posts
    6,054
    that is where your rev limiter is, its in that cdi. you can send it to gthunder and they can take out the rev limiter. way cheaper than buying a whole new box from sparks. if your sputtering is not at really high rpm's then its not your rev limiter. if it is your rev limiter, your shifting way too late. you shouldnt get near the rev limter with a stock motor as it builds max hp quite a while before the rev limiter kicks in
    Planning a comeback...

  7. #7
    Join Date
    Jan 2005
    Location
    Ohio
    Posts
    31
    well the stator didnt do it
    i go 1st to 4th and its ok, then i shift into 5th at lower rpm's and it sputters i cant even get any high rpm's in 5th gear. now in 1st the 4th i can keep it mashed and its at really high rpm's and it runs fine no sputtering at all. thats why i didnt think it was the rev-limiter.
    could it be something internally or within the engine itself?

  8. #8
    Join Date
    Jan 2005
    Location
    Fall River N.S
    Posts
    1,064
    Try stoating out in like 2nd or 3rd gear to see if it when it is undre a load that it's breaking up. That's just a guess.
    2002 300EX

  9. #9
    Join Date
    Jan 2005
    Location
    Ohio
    Posts
    31
    i never thought of doing that ill try that tonight

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