Front Sprocket

Discussion in 'Technical Help' started by Rich Edgeley, May 4, 2017.

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  1. Can any of you kind folks tell me what size is the front sprocket nut on a 865 T100 Bonneville ? I need to borrow a socket and need to know the size !! Rich
     
  2. MickEng

    MickEng Noble Member

    Sep 29, 2016
    1,831
    450
    West Yorkshire
    Hi Rich
    I believe it is 36mm.
     
  3. thebiglad

    thebiglad Old fart, still riding !

    Sep 25, 2013
    5,114
    800
    Central France
    Yup 36 mm for the front sprocket nut. It might be a good idea to have a new lock washer in stock, just in case you can't re-use the old one.

    Just for your info, When I had my T100 EFi I changed the front sprocket from the std 18 tooth jobby to a 19 toother and this reduced cruising revs by about 300rpm.
     
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  4. Thanks guys that's great, I have thought about a different tooth size but my speedo is already over reading I don't want to throw it to far out !!
     
  5. steve lovatt

    steve lovatt Something else
    Subscriber

    May 12, 2014
    7,874
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    Winchester
    The 19 tooth sprocket is supposed to make the speedo accurate.
    Also I found that whilst the 19 tooth one reduced the revs by at least 300 rpm on my 790cc T100 it made little difference on my 865 SE
     
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  6. thebiglad

    thebiglad Old fart, still riding !

    Sep 25, 2013
    5,114
    800
    Central France
    Hi Rich, as Steve says, putting a 19t front sprocket actually improve the speedo accuracy.
     
  7. H.O.

    H.O. Noble Member

    Nov 28, 2015
    1,071
    300
    ARDROSSAN, AYRSHIRE
    Yep, 36mm, 1 of the best jobs I did on mine, made it a totally different bike.
     
  8. dilligaf

    dilligaf ThaiGrrrrr
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    Mar 30, 2017
    14,162
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    Washington Tyne & Wear
    Does this improve or slow acceleration for overtaking
    My speedmaster is a bit of a slug in this department
    I know it's not a sports bike but I would like to improve it
    Cheers
     
  9. H.O.

    H.O. Noble Member

    Nov 28, 2015
    1,071
    300
    ARDROSSAN, AYRSHIRE
    I tended to possibly use a lower gear if I was in a hurry, but it does tend to be slower, to me it made it more manageable in traffic, on the o.e it seemed either too lower gear or too high next one up especially with a pillion passenger.
    Standing starts are slightly slower unless you slip the clutch slightly, not much, but the torque soon see's you through, thats the slight trade off of having a more relaxed touring rev range which I prefered.
     
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  10. thebiglad

    thebiglad Old fart, still riding !

    Sep 25, 2013
    5,114
    800
    Central France
    Hi big D, if you want to give your Speedmaster a bit more go there are lots of options but you might care to contact aussie member Capt who has an America (same mechanicals as yours) which has been modified alot !!
     
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  11. dilligaf

    dilligaf ThaiGrrrrr
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    Mar 30, 2017
    14,162
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    Washington Tyne & Wear
    Big D ?
    I'll have you know I've been on a diet! Ripped I am !
    Anyway I thought this might be a cheap way to improve overtaking acceleration
    Like H O (cheers) it feels like too high or too low which can lead to hesitation and I sometimes have to nip back in and miss the opportunity
    It's no biggie
    Maybe I should get that rocket 3 eh?
     
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