Bought A 2001 Triumph Thunderbird After Not Having A Bike For 20yrs. My How Things Have Changed.

Discussion in 'Technical Help' started by Woofa, Aug 19, 2018.

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  1. Woofa

    Woofa New Member

    Aug 19, 2018
    1
    3
    uk
    Bought a 2001 Triumph Thunderbird after not having a bike for 20yrs. My how things have changed.
    Having problems with starting and fluctuating tick over between 1500- 2000 revs.
    Sometimes it starts no problem but always a fluctuating tick over. I have had to increase tick over by around 1000 revs to stop the bike from stopping.
    Ive replaced the starter solenoid,
    new air box,
    checked tank venting.
    cleaned carbs and synchronised them,
    She seemed ok then. the following day would nt start for a while then eventually started, but the kept stopping increased tick over to keep running but re still fluctuation.
    Could the crank sensor be the problem
     
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  2. Sprinter

    Sprinter Kinigit

    Aug 17, 2014
    5,377
    800
    Grampian.
    Hi.
    How long have you had it?
    How long has this been happening?
    Did you properly clean the carbs?
    Have you run an engine/carb cleaner through the system?
    How old is the petrol?
    Have you taken it out and rode it for a hundred miles?
    Do you have cake?
     
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  3. Sprinter

    Sprinter Kinigit

    Aug 17, 2014
    5,377
    800
    Grampian.
    Your post is up twice, your going to split the responce,:) as you cant delete it, change the name to "please Ignore This Post "and youll be fine, honest.
     
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  4. Tricky-Dicky

    Tricky-Dicky Senior Member

    Dec 12, 2016
    624
    243
    Norfolk UK
    Sounds like the pilot circuit has a problem, either blocked airway or most likely the jet itself, also if they are CV type could be the diaphragm has damage or hole.
     
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  5. Hack Driver

    Hack Driver Well-Known Member

    Oct 12, 2017
    478
    63
    Denton, Maryland USA
    First - Welcome to the forum! I wouldn't expect surges like you're describing from a bad crank position sensor. I would expect a really rough idle where the motor is cutting in and out due to a failing sensor or a short in the wire. Once it progresses, the motor should just stop running. As mentioned above, I would rethink what you did when cleaning the carbs. The surge could be due to 'crud' blocking and/or moving through the jets or fuel screens and causing the motor to run lean and then run normal. Did the bike sit for a while before you bought it? It could also be an air leak, or even minor amounts of water in the fuel. I'm a big believer in Lucas Fuel Treatment. It will 'sort out' some really aggravating problems. If the bike will stay running when you ride, I would put Lucas in the tank and take a long ride. If that doesn't solve the problem, I would look at the jets and fuel screens again.
     
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  6. Dozers Dad

    Dozers Dad Bushmills Chief Quality Controller
    Subscriber

    +1 for the Lucas fuel treatment. If it doesn't work you've not invested a lot of money to try it.
    This is the one I swear by....
    41c2jviK+zL._SY355_.jpg
    Add half the bottle to a full tank of fuel. It says on the bottle that you can't over treat the fuel system. However, I once put a full bottle in approx 8ltrs of fuel & it fouled the plugs. The full bottle in a full tank would probably be fine? I'd still stick to half a bottle to be on the safe side.
     
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  7. Oldyam

    Oldyam Grumpy Old Git

    May 14, 2017
    948
    500
    ireland
    With a bike that age I would firstly,

    Change the carb to head rubbers ( air leaks will cause idle issues )
    Clean the carbs paying extra attention to the idle jets, readjust the pilot screws to 2 turns out from closed
    Check the float heights & float valves.
    Drain the fuel tank into a clean bucket and check the bucket ( t300's have a habit of collecting water in the bottom of the tank )
    Remove the rocker cover and check the valve clearances ( unless you have written proof they were done in the last 3-4000 miles )
    Next time you remove the airbox remove the screws and cut the back in half to make it easier to remove & refit the carbs and filter in future. 22780514_1761925917434980_6270045923387701969_n.jpg 22780579_1761927187434853_7255386756993120568_n.jpg
     
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  8. dirty big hands

    dirty big hands Active Member

    Aug 4, 2017
    149
    43
    sussex
    My TBS is very similar.
    Lovely bikes, with lots of character.
     
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  9. joe mc donald

    Subscriber

    Dec 26, 2014
    4,765
    1,000
    slough / burnham
    Sounds as said on here carbs are to blame. I take it you have new plugs and all that so carb seem to ring true. If the bike has been laid up then I would have the carbs ultra sonic cleaned as people go in there with carb cleaner and the likes and it does more damage than good. I am sure you will get it running again and you will love it. My old t140 I work at it every now and then and it seems that each time I get it closer to the way I want it. Ten more years and it will purr. Can't wait.
    Regards
    Joe
     
  10. Sprinter

    Sprinter Kinigit

    Aug 17, 2014
    5,377
    800
    Grampian.
  11. Woofa

    Woofa New Member

    Aug 19, 2018
    1
    3
    uk
    Had it about a month,
    Been doing it from just after I got the bike,
    Cleaned carbs properly
    Did nt use a carb cleaner
    Some old petrol in tank topped up with new petrol
    Not taken it far as not confident it will not breakdown.
    have you a cake.
    thanks
     
  12. Woofa

    Woofa New Member

    Aug 19, 2018
    1
    3
    uk
    Had it about a month,
    Been doing it from just after I got the bike,
    Cleaned carbs properly
    Did nt use a carb cleaner
    Some old petrol in tank topped up with new petrol
    Not taken it far as not confident it will not breakdown.
    have you a cake.
    thanks
     
    • Useful Useful x 1
  13. Wire-Wheels

    Wire-Wheels Well-Known Member

    Apr 26, 2019
    237
    93
    Southern California
    I know I'm going to be the odd man here but, when you say you cleaned the carbs, I take your word for it. I own 2 of these engines. One 900 Legend and.one 900 Sprint. The thing that has given me the most grief with BOTH of them is ignition coils. Take a look at the coils. If they say."GILL" on the side, throw them in the bin and get some new ones, before you do anything else. You have already been through the carbs. Time to look elsewhere. Thier ignition is CRAP! That has been my experience with these bikes. Take my advice or not. I have had T-3 Triumphs for 17 years. ...J.D.
     
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