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e-start clunking?

Discussion in 'Norton Commando Motorcycles (Classic)' started by maylar, Jul 12, 2019.

  1. maylar

    maylar VIP MEMBER

    May 13, 2007
    Just finished installing a CnW e-start on my 850. Here's the initial start up. I've never run the bike without a primary cover in place before, and I'm wondering what that clunking at idle is...

    http://davidrcullen.com/Norton Start.MOV
  2. Bob Z.

    Bob Z.

    Mar 30, 2012
    I can see the video fine but can't un-mute the sound icon.
  3. L.A.B.

    L.A.B. Moderator VIP MEMBER

    Nov 20, 2004
    Same, no sound.
  4. lazyeye6

    lazyeye6 VIP MEMBER

    Feb 28, 2014
    I can see and hear it fine. I've never had that sound with my cNw electric start. I'm thinking you should contact
    Matt for a diagnosis.
  5. MichaelB

    MichaelB VIP MEMBER

    Jan 14, 2004
    I can hear it. Maybe the belt is slapping the bottom case.
    I concur with Lazyeye6, contact Matt.

    Very nice Commando BTW.....
  6. Ron L


    Feb 27, 2004
    I think you are right. And it is a very nice Commando!
  7. 1up3down


    Jan 12, 2011
    Well, call it blasphemy but I still say that belt primary tensions are being recommended too loose

    Norvil says set it up so there is a 90 degree twist in the upper belt in the middle, this advice is now considered sacred

    that is too loose and it comes from someone originally and rightfully understanding that as the baskets and primary heats up
    the belt of course gets tighter

    go ahead, set it up with a 90 degree twist, ride until the primary is blazing hot, pull off the outer cover and you still have plenty
    of belt looseness

    remember, the belt is tightest at the top because of the drive pull, the bottom belt will signal too tight only it has virtually no slack
    with a fully heated up primary

    the sound you are hearing is the belt slapping the bottom on the primary because it is too damn loose and will now wear faster too

    set the belt when cold with around 70 degrees twist not 90 or some 30mm not 35mm upper belt movement

    downward pressure on the kickstarter will tighten the upper belt, doing so with a fully hot primary will show you that the lower belt still has some slack, perfect
    Last edited: Jul 12, 2019
  8. Classic Cycle Repair

    Classic Cycle Repair

    Apr 1, 2019
    Crankshaft striking the inner chaincase fastener(s)? Did you check for contact during dummy assembly? It is a bit tricky trying to hear it, as the movie does not play smoothly for me.
    Have you taken the pugs out, and turned everything slowly over by hand to potentially detect any contact issue?
  9. cNw


    Apr 16, 2009

    I will get a hold of you in the morning and we’ll figure it out. No worries

  10. jaydee75


    Jul 2, 2012
    Did anyone find out why some of us cannot hear it??
  11. maylar

    maylar VIP MEMBER

    May 13, 2007
    Belt tension is set per Matt's instructions. The primary bolts were provided with the kit. I will check for noises while turning it over by hand, thanks for the tip.

    The file is a .MOV movie (a big one) so I dunno why some can't hear it. You guys might have better luck visiting my web page - http://davidrcullen.com/norton.html
    The link to the movie file is at the bottom of that page.

    I've also uploaded it to You Tube - let's see if this works ...

  12. jaydee75


    Jul 2, 2012
    Sound works now. Sounds like belt slap to me.
  13. Fast Eddie

    Fast Eddie VIP MEMBER

    Oct 4, 2013
    Sounds like a 961 ...

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