2001 Bonneville Tech Questions

Discussion in 'Technical Help' started by Rainman, Aug 21, 2019.

  1. Rainman

    Rainman Well-Known Member

    Aug 21, 2019
    102
    83
    Wiltshire
    Hi to all - Newbie from Wiltshire here.

    I have just purchased a 2001 Bonneville with around 25000 miles on the clock and as I have no service history have just started doing a few things to it before I ride it.

    The air filter was in a terrible state and very oily with oil pooled in the bottom of the air box - I have heard that there is a mod to remedy this problem as believe t was quite common on the early models?

    Also thinking of removing the Air injection system - is this straightforward if I buy a kit?

    Also wierdly the nearside fork dust seal was badly corroded and has let water ingress to the seal and rusted the retaining clip but the seals seem ok as the fork leg still had most of the specified volume of oil in it albeit very thin so will be changing the oil in the forks!

    I removed the rusted clip and cleaned it up and think will be ok

    Grateful for any help!

    Thanks in advance
     
  2. Callumity

    Callumity Elite Member

    Feb 25, 2017
    3,358
    800
    Nr Biggar
    Well 25,000 is no great mileage and the engine is pretty bulletproof. I would be checking valve clearances.

    Apart from the obvious oil/filter change you want the Haynes manual to keep you on the straight and narrow.

    Changing fork oil requires dropping the tubes out and it really makes sense to renew the seals and fit gaiters at the same time. Use the Triumph OEM items as most of the aftermarket items seem to split.....
    https://www.worldoftriumph.com/part...g/triumphmc/modelid/3130/block/100064852-0-2/
    They will preserve your forks far better than the plastic shin pads!

    Air injection removal is a doddle. Del Boy’s Garage on YouTube has a how to video. In isolation the benefits are marginal.

    You airbox has a blocked drain tube. The hose drops down behind the swing arm. Remove the filter and rod it (the hose!) through. The oil is from the crankcase breather and normally just a mist recycled through the intake.

    Beyond that, look at Triumph Twin Power https://www.triumphtwinpower.com/
    for tuning possibilities.
     
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  3. Rainman

    Rainman Well-Known Member

    Aug 21, 2019
    102
    83
    Wiltshire
    Hi Callumity - thanks so much for the info. I still have a Haynes manual from when I had a Bonneville a few years ago so that’s a plus!

    I will look into the airbox drain and take a look at that YouTube video as you suggest.

    Cheers, Shaun

     
  4. Rainman

    Rainman Well-Known Member

    Aug 21, 2019
    102
    83
    Wiltshire
    Hi again - have looked at the drain hole at the bottom of the Airbox and the tube is full and can’t drain out at the end is sealed as per the Haynes manual which is telling me to remove the tube and clean it - pretty fiddly job so is there a mod for this? Like putting on a longer tube and fixing the end over the chain ??
     
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  5. Callumity

    Callumity Elite Member

    Feb 25, 2017
    3,358
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    Nr Biggar
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  6. Rainman

    Rainman Well-Known Member

    Aug 21, 2019
    102
    83
    Wiltshire
    The breather is standard set up between the top of the nearside crankcase and the airbox - it’s the drain pipe at the bottom that is flat at the end and sealed - this fills up with condensation and oil and the manual says it has to be cleaned out from time to time which I suppose is not too bad a thing to do - thought perhaps I could put on a longer tube and suspend it over the chain or hang it out over the rear fender like on the classic triumphs...
     
  7. Callumity

    Callumity Elite Member

    Feb 25, 2017
    3,358
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    Nr Biggar
    Let’s not confuse the two tubes! In and Out!

    If you re-route In then you obviate the entire problem (apart from occasional crankcase filter cleaning). A 360 degree Twin with both pistons rising and falling in unison creates over pressure that needs venting.......

    Your Out tube from the airbox should be crimped at the bottom end so unfiltered air cannot be drawn in. I think some early models maybe had a bung for periodic tube cleaning.
     
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  8. Rainman

    Rainman Well-Known Member

    Aug 21, 2019
    102
    83
    Wiltshire
    What you are saying makes perfect sense - I will clean the sealed drain tube and get one of those filters and put it on the breather pipe and seal up the breather pipe connection to the air box Thanks !
     
  9. Dartplayer

    Dartplayer Crème de la Crème

    Aug 8, 2018
    7,540
    1,000
    New Zealand
    Hi Shaun and welcome to the forum :cool: sounds like you’ve got this one sorted
     
  10. Rainman

    Rainman Well-Known Member

    Aug 21, 2019
    102
    83
    Wiltshire
    Yep so far dust seals and fork gaiters fitted and new fork oil. Air injection system removal kit fitted, new front pads and oil and filter change to be done and fit a grab rail that I picked up on eBay for £18!

    Next I need to think about a nice retro colour scheme for the tank and mudguards but before that hoping to just ride and enjoy!
     
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