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wont rev ove 4000 rpm

Discussion in 'Hangout Lounge' started by howzie, Jul 23, 2010.

  1. howzie

    howzie New Member

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    can any one please help me . . . . . . i have a xj650 that wont rev over 4000rpm ive changed the coils. checked all earths and all conections cleaned the carbs more times than i can count. 1 . 2 . 3 . 4 . erm?????.
    im at my wits end with it . has any one delt with such a problem?????
     
    howzie, Jul 23, 2010
    #1
  2. markie

    markie Member

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    No! In a word. Right: What happens out of gear? Will the bike rev higher?

    If it will and steadily, then it suggests the TCI/pickup side of things is ok.

    4000 is really low - is that on the road? It could be a carburation issue as I believe the pilot jets take care of things up to 3000 then the main jets take over.

    When I still had my 600, I found that if you rode below 3000 the engine went to sleep!
     
    markie, Jul 23, 2010
    #2
  3. tjb2of3

    tjb2of3 Member

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    Just a thought, but have you checked the throttle cable itself? It maybe could have gotten kinked around something when you took the carbs off to clean them.
     
    tjb2of3, Jul 23, 2010
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  4. RickCoMatic

    RickCoMatic Well-Known Member

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    Generally, ... a running Bike that cannot get to make High-rpm's means that the Carbs aren't in-the-game.

    Usually, ... you point right to the Emulsion Tubes and blame them for being clogged and not providing enough AIR to increase FUEL Supplied by the Main Jets.

    But,, ... thee years have passed. The Diaphragm Piston Bores have oxidized, ... shrinking the Bore just enough to restrict movement of the Diaphragm Piston.

    IF, ... you cleaned the Carbs abd didn't push-out the Center Main Nozzle (Emulsion Tubes) ... look there.

    Test the four Diaphragm for Free Movement.
    Do a "Clunk Test"

    If it ain't either of thoise we got a few other things for you to do.
    Bring a lunch.
     
    RickCoMatic, Jul 23, 2010
    #4

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