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Crank sprocket won't budge

Discussion in 'Norton Commando Motorcycles (Classic)' started by htown16, Oct 12, 2019.

  1. htown16


    Apr 29, 2009
    Disassembling a bike that has sat with it's primary cover off for a long time. Got my puller on the crank sprocket and it won't pop. Tried my MAP torch on it for a good long time. No go. Any ideas?
  2. concours

    concours VIP MEMBER

    Dec 29, 2011
    Keep it up. Puller on, heat the sprocket to 300, tap the push screw with a hammer.
    Repeat. Drink a beer. Do it again.
    It’ll come.
    Craig likes this.
  3. Richard Tool

    Richard Tool

    Aug 3, 2019
    If you can beg , borrow , rent , ( buy but very expensive) an induction heater that should do it . If you are not familiar with these they have various size cables you wrap around nuts , studs ,bearings etc. The beauty of these is they concentrate the heat on the part you are trying to expand whereas a torch heats both the pinion and the shaft.
  4. htown16


    Apr 29, 2009
    Got it. Refered to the shop manual and they said to give the outside edge of the sprocket a "sharp blow" with a hammer and drift to break the taper. Imagine that, reading the instructions worked.
    The Buckeye Rider, Craig and oldmikew like this.
  5. acotrel


    Jun 30, 2012
    When in doubt, read the book ? - It is something I never do. Instructions are for other people.
    The Buckeye Rider likes this.

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