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86 Maxim X (750) can't make it past 5K RPM!

Discussion in 'XJ Technical Chat' started by whoizzy, Apr 5, 2007.

  1. whoizzy

    whoizzy New Member

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    I can't get my bike past 5K rpm. It doesn't sputter or buck, It just feels like thats the limit. Any suggestions? Thanks
     
    whoizzy, Apr 5, 2007
    #1
  2. flashsnapshot

    flashsnapshot Member

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    I am in the same boat too, Anything more seems like it is straining
     
    flashsnapshot, Apr 5, 2007
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  3. foxfighter

    foxfighter Member

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    mine starts but wont rev almost at all i too feel i am in this boat
     
    foxfighter, Apr 5, 2007
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  4. Fongdingo

    Fongdingo Member

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    take a look at your spark plugs put new ones in
     
    Fongdingo, Apr 5, 2007
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  5. RickCoMatic

    RickCoMatic Well-Known Member

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    If the Diaphragm Pistons are not rising as they should because their bores are "Tight" do to the Aluminum Oxidation ... they don't move the Needle UP sufficiently to allow the Maximum Supply from the Main Jet.

    Fouled / Clogged / Wrong ~> Main Jet.
    Incorrect Placement Upper Body Air Jets below Diaphragm ~> (Reversed)
    Throttle Cable Connection Mount attached to wrong Carb. ~> (Bad angle)

    Incorrect Placement Upper Body Air Jets below Diaphragm ~> (Reversed)
    Haynes Manual Placement of these Jets Incorrect !!!
     
    RickCoMatic, Apr 6, 2007
    #5
  6. Russxlr8s

    Russxlr8s Member

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    Definately check Ricks suggestions, the slides should move freely by poping them up with your finger. I know not easy when stock airbox and boots are in the way.
    Just go threw steps of varifying things of probable cause. Put a timing light on each spark plug wire, rev it and see if you start loosing spark once the rev's get up there. I know old spark plug boots or wires have been causing some guys problems.

    Also get some clear tubing, connect to the drain of the float bowl and hold up the other end looped next to the bowl while on centerstand, open the drain screw and check to make sure your float level (gas line) you see in the tubing is to within .70 of an inch from the mount surface of the bowl to the carb body. Manual says .3 - .7 but I find as long as your around 1 tenth inch to 1/8th from top surface it's usually ok to not be sucking the bowls dry or below the main jet on accelerating while under load.

    Good Luck
     
    Russxlr8s, Apr 6, 2007
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