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Which Direction Does the Commando Engine Rotate?

Discussion in 'Norton Commando Motorcycles (Classic)' started by thunderbolt, Jan 7, 2019.

  1. thunderbolt

    thunderbolt

    Joined:
    May 16, 2016
    Hi there, Can someone tell me which way the Commando engine rotates look at it from the drive side please?

    I see people rotating the crank in both directions on youtube.

    Thanks Don
     
  2. WEAL Norton

    WEAL Norton

    Joined:
    Nov 17, 2009
  3. Triton Thrasher

    Triton Thrasher

    Joined:
    Feb 10, 2009
    Same direction as the wheels.
     
  4. thunderbolt

    thunderbolt

    Joined:
    May 16, 2016
    Thanks guys, appreciated.
     
  5. acotrel

    acotrel

    Joined:
    Jun 30, 2012
    There are very few bikes in which the crank runs backwards. An exception is the Ducati Panagale. When they ran the motor backwards they found it handled better when coming out of corners.
     
  6. NKN

    NKN

    Joined:
    Mar 28, 2016
    Begin this one @ 2:50
     
    Woody850 and Schilling like this.
  7. oldbeezer

    oldbeezer VIP MEMBER

    Joined:
    Nov 2, 2017
    I do believe the round case Ducati cranks ran "backwards"
     
  8. texasSlick

    texasSlick VIP MEMBER

    Joined:
    Jan 2, 2013
    "Backwards" running engines will pitch the front wheel downwards when the bike is airborne.

    Slick
     
  9. baz

    baz VIP MEMBER

    Joined:
    May 26, 2010
    A Yamaha xs1100 engine runs backwards
     
  10. Stephen Hill

    Stephen Hill

    Joined:
    Oct 28, 2009
    My WR400 Husky will run backwards if it kicks back and starts running.
    Gives you 6 speeds in reverse. Careful when you drop the clutch.
    :)

    Stephen Hill
     
    baz likes this.
  11. Time Warp

    Time Warp .......back to the 70's. VIP MEMBER

    Joined:
    Dec 3, 2012
    With a chain primary drive the crankshaft needs to turn in the same direction as the clutch CCW, on bike with a non chain gear primary drive (most bikes on the planet) the crankshaft needs to turn CW to turn the clutch CCW ?

    Maybe I missed something, backward rotating clutches CW with counter rotating front drive sprockets (chain) CCW to match the rear wheel ?
     
  12. L.A.B.

    L.A.B. Moderator VIP MEMBER

    Joined:
    Nov 20, 2004
    However, for "most bikes on the planet" the drive is usually 'in' through the gearbox mainshaft, and 'out' (to the gearbox drive sprocket) through the layshaft.
     
    Last edited: Jan 9, 2019
  13. Time Warp

    Time Warp .......back to the 70's. VIP MEMBER

    Joined:
    Dec 3, 2012
    That actually sounds correct which is no surprise.
    The Ducati (older models) might be the oddity as they are primary gear drive but with a Norton style sleeve gear ?
    I think having a few of those I threw them in with Japanese bikes with gear primaries.

    I just gave some thought to where the cam chain tensioners are on some of my bikes, hmmm CCW turning crankshafts.
    See what happens when you doubt A Cotrel.:)
     
    Last edited: Jan 9, 2019
    NKN likes this.
  14. Time Warp

    Time Warp .......back to the 70's. VIP MEMBER

    Joined:
    Dec 3, 2012
    I think this is what got me confused (having both round and square case Ducati's, the gear box clusters are more or less the same)

    You can have bikes for decades and forget what is actually going on inside them as I did.
     
  15. MexicoMike

    MexicoMike

    Joined:
    Jan 31, 2010
    I had not been aware of those Kevin Cameron videos. After watching that posted video I then found/watched several of them - great stuff and very well presented/explained/demonstrated. Thanks for posting it!
     
  16. NKN

    NKN

    Joined:
    Mar 28, 2016
    ;)
     
  17. grandpaul

    grandpaul VIP MEMBER

    Joined:
    Jan 15, 2008
    The ENGINE actually rotates in BOTH directions, to the limits of the isolastic rubbers. The CRANKSHAFT can also rotate in both directions, but in normal operation it rotates clockwise from the timing side.
     
    998cc likes this.
  18. concours

    concours VIP MEMBER

    Joined:
    Dec 29, 2011
    Only if you whack the throttle while airborne
     
  19. thunderbolt

    thunderbolt

    Joined:
    May 16, 2016
    My only reason for asking is that my assembled 850 motor is on the work bench and I needed to know this information to enable me to do some other tasks on the motor which require the motor to be turned in the correct direction of rotation.

    Thanks everyone,
    Don
     
  20. acotrel

    acotrel

    Joined:
    Jun 30, 2012
    In most bikes with geared primary drive, the input and output shafts of the gearbox are not on the same centre. so the output shaft turns in the opposite direction to the input shaft. The clutch is on the input shaft. With any bike with a chain primary, everything except the gearbox lay shaft and the idler timing gear usually runs in the same direction as the wheels, unless there is a Japanese type gearbox fitted - which is unusual in older bikes.
     
    Last edited: Jan 12, 2019