Question about 2003 Harley Davidson FXSTB Night Train

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Hiya I have noise in the front left hand primary cover [knocking noise] Sometimes it goes away when I pull the clutch in and out other than this the bike runs fine and doesn't miss a beat. [Noise started off faint but has gotten louder]Sounds like bottom end but don't think so ....

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  • krunkie_junk May 23, 2011

    thanks Steve
    Will have a look in the next couple of days and let you know how it goes ..
    Tom
    New Zealand

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More than likely, it's either a loose primary chain or possibly the compensator sprocket. If the noise is at idle, this will probably be the case. Now, if the noise occurs when you roll the throttle on but goes away when just cruising, you may have a bottom end problem. If I were you, I'd disconnect the battery and pull the outer primary cover off. Check the torque on the compensator nut. It should be torqued to 150-165 foot pounds of torque. You'll need a "locking bar" to lock the engine and transmission to keep it from turning in order to apply that amount of torque. Check the adjustment of the primary chain. 3/4 to 7/8 inch with the engine cold. When you refill the primary with oil, do it with the bike standing straight up. Fill to the bottom edge of the outer clutch shell, the bright aluminum part.

Good Luck
Steve

Posted on May 22, 2011

  • wd4ity
    wd4ity May 23, 2011

    Ok Tom. I'm not up on the new Twin Cams although I've been working on Harleys for quite a while. From my experiences, if the sprocket shaft bearings are bad, when you roll the throttle on at about 30-40 miles per hour in fourth or fifth gear (low engine RPMs), you'll hear a loud knocking noise coming from the engine. It sounds like someone inside the engine with a sledgehammer. Your problem could be the compensator nut loose or the "spring cup" that the nut holds on. If you can trun the cup with your hands, the springs have lost their tension for some reason. They are not coiled springs, more like "spring washers".

    Good Luck

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