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Primary chain event

Discussion in 'Norton Commando Motorcycles (Classic)' started by Gilesy, Apr 19, 2019.

  1. Reggie

    Reggie

    Joined:
    Jul 24, 2006
    This is who now runs Andy the chain man's business.

    https://the-chain-man.co.uk/

    These are his contact details.

    "Call us today on 07564870313 or Email us at jason@the-chain-man.co.uk"
     
    ashman likes this.
  2. Gilesy

    Gilesy VIP MEMBER

    Joined:
    Aug 27, 2017
    Just an update. I checked sprockets and they were both OK. I put a dial gauge on the crank both bare and with the rotor, that was OK. Mainshaft was ok but difficult to measure owing to splines, but measuring to each spline gave no bend. I put on a new duplex chain and replaced the clutch hub bearing. I checked my records and the sleeve gear and the other mainshaft bearing had been replaced, as had the layshaft bearing. The sleeve gear bushes were not replaced. When I tightened the primary, as per manual then retightened rear chain, the primary went tight. The gear box is not moving so the front sprocket must be being pulled back, therefore tightening primary chain. What is the most likely culprit, sleeve gear bushes, mainshaft/clutch hub spline or what? Should I even worry and just adjust chains with a bit of extra slack?
     
  3. jbruney

    jbruney

    Joined:
    Jan 5, 2019
    Someone else shall be of different opinion, but I just leave a tad of play in my drive chain because every time that I've tried to get it by the book the primary tightens. Besides used sprockets + new chain needs to run in some. Run it a bit & let things settle in, and then see if you can get proper adjustment.
     

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