Thruxton Chain Adjustment Side Stand

Discussion in 'Thruxton, Scrambler & Trident' started by TonyG, Sep 20, 2019.

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  1. TonyG

    TonyG Noble Member

    Dec 1, 2016
    720
    443
    Bucks
    Hi,

    Manual states you must check the tension with the bike held upright, but I don't have a paddock stand. Do I really need a second person to adjust the chain or can I just check it on the side stand like nearly every other bike in the world?

    Oh, it's a 2018 Thruxton..

    Cheers
     
  2. crispey

    crispey crispey creme de la creme

    Nov 6, 2014
    7,194
    1,000
    Uk
    Put a block of wood under the side stand so it’s as near to upright as possible and adjust the chain to the greater number ie if it’s 20-30mm go for 30mm.
     
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  3. TonyG

    TonyG Noble Member

    Dec 1, 2016
    720
    443
    Bucks
    Thanks all,

    I might look at one of those wheel chocks, for now though I think I'll just do it as Crispey said.

    Cheers
     
  4. TonyG

    TonyG Noble Member

    Dec 1, 2016
    720
    443
    Bucks
    Just in case anyone is interested, I measured my chain with the bike almost upright, and it seemed to be about 40mm. Thought I'd try putting in another block of wood under the sidestand to get it even more upright, and free play dropped to 30 mm. I think it does need to be fully upright as the manual states.
     
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  5. Rudeboy

    Rudeboy Senior Member

    May 2, 2017
    402
    113
    Bristol
    Similar method used by me but without the laserline then I check with a steel ruler with pvc tape on it as a refrence point
     
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  6. Cam

    Cam New Member

    Feb 16, 2020
    8
    3
    Darlington
    Hi. I have a 2019 Thruxton R. I can’t find in the manuals what size socket for the rear wheel spindle nut. Anyone help ? It’s possibly around 24mm. Cheers.
     
  7. Vectis John

    Vectis John Well-Known Member

    Apr 17, 2019
    88
    68
    Isle of Wight
    Bonneville is 27mm. Definitely use a socket apparently using a spanner chews the nut on the spindle.
     
  8. Cam

    Cam New Member

    Feb 16, 2020
    8
    3
    Darlington
    Thanks very much John
     
  9. Cam

    Cam New Member

    Feb 16, 2020
    8
    3
    Darlington
    My Thruxton Bonneville. One more thing. Rear wheel spindle but. The thread is normal anti clockwise to unscrew ? It’s stuck !
     
  10. Vectis John

    Vectis John Well-Known Member

    Apr 17, 2019
    88
    68
    Isle of Wight
    Yes it is, it is tightened to a high torque. I had to use a long extension bar to shift it the first time. Be careful you don’t let it slip!
    Can’t remember the figure of the top of my head, I am sure someone here will tell you.
     
  11. Cam

    Cam New Member

    Feb 16, 2020
    8
    3
    Darlington
    That makes sense. I’ll try and get an extension. Thanks again Vectis John ! Cheers.
     
  12. R341N1994

    R341N1994 New Member

    May 9, 2020
    0
    1
    los angeles
    i need you guys help, do you have to losen lock nuts on both right and left? do you have to adjust the adjustment nuts on both sides or just spindle side? the manual is confusing to follow. i saw a yt tutorial the guy just adjusts the spindle side didnt mention if he had to do anything on the opposite side. thanks.
     
  13. Vectis John

    Vectis John Well-Known Member

    Apr 17, 2019
    88
    68
    Isle of Wight
    The spindle has a lock nut on one side, loosen that.You dont need to touch the other side. It is very tight so use a good quality well fitting 27mm socket (16 point) not an adjustable wrench or spanner as you can mark the nut. Then loosen the lock nuts on the two adjusters - these are the bolts on either side of the swing arm ends. If you look you will see that as you tighten or loosen the bolt it moves the spindle backwards or forwards, tightening or loosening the chain. You need turn both of these to achieve the correct amount of slack on the chain. Turn both the same amount to ensure the back wheel stays aligned in the swing arm. My Bonnie has marks to help you achieve this. I also double check with a vernier gauge as the marks are very feint on my bike. Also on my Bonnie I have to take the silencer off to get to the spindle nut and adjusters. When you are done don't forget to re torque the spindle nut. Not sure what the Thruxton is but someone on here will tell you.
     
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  14. crispey

    crispey crispey creme de la creme

    Nov 6, 2014
    7,194
    1,000
    Uk
    #14 crispey, May 9, 2020
    Last edited: May 9, 2020
    Hi, yes to the above. I will only add that you should check the slack of the chain All round as you might have a tight spot on your chain, as they can stretch unevenly, and use this area to measure the tension as you adjust it. Also re check the tension once you have finished and tightened the spindle nut.
    Spindle nut is 85nm
     
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  15. R341N1994

    R341N1994 New Member

    May 9, 2020
    0
    1
    los angeles
    thank you.
     
  16. R341N1994

    R341N1994 New Member

    May 9, 2020
    0
    1
    los angeles
    thanks for the detailed instructions. i want to double check something; when you say the lock nuts do you mean the pair right by the spindle nut? what about the pair furthest away from the wheel, the manual mentioned to losen it, but did not mention for both sides. so im assuming i just have to losen those and turn the pair closest to the spindle/wheel to make adjustments correct? then afterward i just have to hold them in place while i lock up the pair furthest away and then lock the main spindle nut? thanks in advance. apologize for dumb questions this is my first time messing with my bike.
     
  17. crispey

    crispey crispey creme de la creme

    Nov 6, 2014
    7,194
    1,000
    Uk
    Not such a stupid question as we've been confusing you all the way through! Just checked my thrux and there are no lock nuts, they are different. I'm assuming you have an aircooled thrux
    thumbnail (1).jpg thumbnail.jpg
     
  18. Vectis John

    Vectis John Well-Known Member

    Apr 17, 2019
    88
    68
    Isle of Wight
    Sorry I wrongly assumed you had a new LC Thruxton. The adjusters are different. The principles are the same, adjust both sides as above. Sorry to confuse you. Good luck!
     
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  19. capt

    capt Elite Member

    May 8, 2016
    3,052
    750
    western Australia
    Most chain adjustment systems don't have lock nut's on the adjustment ! As tightening the axle but locks the adjustment plates in place !
     
  20. Vectis John

    Vectis John Well-Known Member

    Apr 17, 2019
    88
    68
    Isle of Wight
    True but the 2016 on Bonnies do have lock nuts on the adjusters, the adjustment is built into the end of the swing arm, I had assumed the OP had a 2016 on bike.
     
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