19 tooth sprocket

Discussion in 'Bonneville' started by steve lovatt, Jan 19, 2017.

  1. steve lovatt

    steve lovatt Something else

    May 12, 2014
    9,230
    1,000
    North Yorkshire
    #1 steve lovatt, Jan 19, 2017
    Just got this from TEC.
    Had one on my T100 - reduces revs by around 300rpm, better for cruising at motorway speeds.
    Will be fitted this weekend.

    2017-01-19 12.12.16.jpg
     
    • Like Like x 1
  2. curly

    curly Noble Member

    Jul 3, 2016
    758
    443
    Burton Upon Trent
    #2 curly, Jan 19, 2017
    That will be an interesting follow up report, I very often go for that missing 6th gear!

    Curly
     
  3. thebiglad

    thebiglad Old fart, still riding !

    Sep 25, 2013
    5,068
    1,000
    Central France
    #3 thebiglad, Jan 19, 2017
    I had a 19T on my T100 as well. As Steve says you lose about 300rpm for a given speed plus the speedo (if it's a gearbox driven one) reads absolutely spot-on accurate, instead of being a bit 'optimistic'.
     
  4. chough23

    chough23 New Member

    Jan 17, 2017
    1
    3
    Helston
    #4 chough23, Jan 19, 2017
    Also on my to do list. Enough torque on the Bonnie so relax and lower the revs. Mmay increase MPG? depends I spose.
     
  5. steve lovatt

    steve lovatt Something else

    May 12, 2014
    9,230
    1,000
    North Yorkshire
    #5 steve lovatt, Jan 19, 2017
    May increase mpg but whether that would be enough to notice remains to be seen.
    Will be interesting to see the difference the rev reduction makes on this bike. My T100 was a 2004 model with carbs and revved higher than the EFI model - it definitely felt as if it needed a 6th gear but the SE is more relaxed to begin with.
     
  6. Kev06

    Kev06 Active Member

    Jun 18, 2016
    45
    28
    Scotland
    #6 Kev06, Jan 19, 2017
    Looking forward to a follow up as my 2014 thruxton desperately needs a 6th gear.

    A modification that is on my list to do
     
  7. crispey

    crispey crispey creme de la creme

    Nov 6, 2014
    7,248
    1,000
    Uk
    #7 crispey, Jan 19, 2017
    Just be careful with those torque settings!:rolleyes:
     
  8. Tigcraft

    Tigcraft Unheard of Member

    Mar 29, 2014
    2,622
    800
    Holmfirth West Yorkshire
    #8 Tigcraft, Jan 20, 2017
    Wonder how much a tooth on the front takes up on the chain? It's a nice idea for getting an accurate speed reading although I'm comfortable with the original gearing in them hills o' mine.
     
  9. steve lovatt

    steve lovatt Something else

    May 12, 2014
    9,230
    1,000
    North Yorkshire
    #9 steve lovatt, Jan 22, 2017
    All done.
    Easy job but you will need a 36mm socket.
    Bend back the washer to remove the nut and remember to bend it back in place when you refit the new sprocket.

    20170122_162452.jpg
    Here's the new 19 tooth on.
    20170122_163451.jpg
    Hopefully road test tomorrow !
     
    • Like Like x 3
  10. Tigcraft

    Tigcraft Unheard of Member

    Mar 29, 2014
    2,622
    800
    Holmfirth West Yorkshire
    #10 Tigcraft, Jan 22, 2017
    Oh truly hard job!!
     
    • Like Like x 1
  11. pasher

    pasher Well-Known Member

    Sep 23, 2016
    138
    93
    Nottingham
    #11 pasher, Jan 22, 2017
    Amazed that they are still using that type of locking washer - It takes me back too many years to remember. But if it works, why change it :)
     
    • Like Like x 1
  12. Tigcraft

    Tigcraft Unheard of Member

    Mar 29, 2014
    2,622
    800
    Holmfirth West Yorkshire
    #12 Tigcraft, Jan 22, 2017
    Yes true, simplicity at its best
     
    • Like Like x 1
  13. capt

    capt Elite Member

    May 8, 2016
    3,051
    750
    western Australia
    #13 capt, Jan 22, 2017
    Hi Steve,
    I have changed chains and sprockets on my Triumphs, being 94 trident,00 sprint and 08 America, all had 36mm nut on the front sprocket output shaft, me thinks I see a commonality here and some forward planning by Triumph !!
    I'm thinking this might be common on all chain driven Triumph motorcycle's ?

    Cheers capt.
     
    • Like Like x 1
  14. steve lovatt

    steve lovatt Something else

    May 12, 2014
    9,230
    1,000
    North Yorkshire
    #14 steve lovatt, Jan 24, 2017
    No chance to test yesterday as we had freezing fog.
    Better today but roads still wet but went for it anyway.
    First impressions: The reduction in rpm is not as noticeable on the rev counter as it will be on the 790cc Bonnies because with them, the speedo is a cable drive off the front wheel. The later EFI bikes have a speed sensor off the gearbox so the change of sprocket does change the speedo reading - makes it accurate I believe. As such the visual difference is not very much - just can't quite match 70mph with 4000 rpm.
    Didn't feel as if it affected acceleration in the lower range at all but overall it did feel like it wasn't working quite as hard as before but I think I need to put a good few more miles on it yet to pass proper judgement.
     
    • Like Like x 1
  15. Hogster

    Hogster Active Member

    May 12, 2016
    159
    43
    Devon
    #15 Hogster, Feb 28, 2017
    Anyone know where I can get a 520 pitch 19 tooth from, fancy giving it a try but the Newchurch is non std!
     
  16. thebiglad

    thebiglad Old fart, still riding !

    Sep 25, 2013
    5,068
    1,000
    Central France
    #16 thebiglad, Feb 28, 2017
    Try Ebay ???
     
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