Triumph Thunderbird Sport Won't Start

Discussion in 'Newbies Hangout' started by GypsySOHMC, Mar 18, 2019.

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  1. GypsySOHMC

    GypsySOHMC Member

    Mar 18, 2019
    8
    8
    Stoke on Trent
    I hope someone can help I'm at my wits end. I've got 1998 Thunderbird sport that just won't start.
    New fully charged battery
    Carbs stripped and cleaned
    Plugs new, gapped and checked for spark
    Clutch switch checked and working
    sidestand switch cleaned
    But nothing at all. Air filter box is currently off because I can't see the point of fitting it until at least coughs
     
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  2. joe mc donald

    Subscriber

    Dec 26, 2014
    13,988
    1,000
    slough / burnham
    Again how many miles on the bike how long has it sat around. Has it got any service history.
    Regards
    Joe.
     
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  3. Angus

    Angus Noble Member

    Mar 19, 2017
    936
    300
    South Africa
    Any history prior to your problem? Did you ride it recently and then parked and the next day it didn’t fire up. Is there another thread of yours about this problem on the forum mate ? BTW welcome in !
     
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  4. Helmut Visor

    Helmut Visor Only dead fish go with the flow
    Subscriber

    Oct 3, 2018
    6,129
    800
    Three Counties
    Hi Gypsy, and welcome in :cool::cool: If you've already started a thread in the Tech help then hopefully you'll get all the help you need, good luck ;);)
     
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  5. Sprinter

    Sprinter Kinigit

    Aug 17, 2014
    6,027
    1,000
    uk
    Starting System Symptoms:

    Weak battery symptoms:
    -- Slow cranking.
    -- Stops cranking suddenly on compression stroke with button pressed.
    -- Starts when starter button is released at end of cranking.
    Repair:
    -- Charge/Test/Replace battery.
    Failure Modes:
    -- Loss of capacity. Appears to charge, voltage good but no reserve for starting.
    -- Won't hold a charge.
    -- Low voltage/cell failure.
    Preventative Maintenance:
    -- Check fluid levels regularly
    -- Maintain full charge: Regular riding, trickle charger.

    Ignition Coil failure symptoms:
    -- Hard starting/misfiring during cranking.
    -- Rough idle that can't be tuned out with carb adjustments and carb cleaning.
    -- Idle misfire clears with new sparkplugs, returns in a few hundred miles
    Repair:
    -- Replace: Preferably with Nology for higher reliability than stock Gill coils.
    Failure Mode:
    -- Shorted turns in secondary resulting in weak spark.
    Preventative Maintenance:
    -- None
    Testing:

    Pickup Coil failure symptoms:
    -- No spark at all
    -- Spark quits with engine hot, returns when engine cool.
    -- Note: Pickup coil failure is total. There is no random misfire spark loss.
    Repair:
    -- Replace pickup coil
    Failure mode:
    -- Thermal intermittant with long (15-30 minute) period.
    Preventative Maintenance:
    -- None. Get a spare.
    Testing:
    -- Ohms checks hot and cold.

    Worn starter symptoms:
    -- Sometimes won't crank until the bike is rocked in gear.
    -- Excessively noisy cranking with a grinding sound.
    -- Click from under seat but no cranking.
    Failure Mode:
    -- Brush wear progressing to commutator damage.
    -- Bearing failure related to brush wear.
    Repair:
    -- Rebuild or replace.
    Preventative Maintenance:
    -- Maintain battery in peak condition.
    -- Follow proper starting procedures. Neutral, clutch in.
    -- Crank 5-10 seconds at a time max., switch off for twice as long before cranking again.

    Worn sprag clutch symptoms:
    -- Very loud rattling when cranking
    -- Starter spins but engine doesn't turn
    Falure Mode:
    -- Breakage
    Repair:
    -- Replace sprag clutch
    Preventative Maintenance:
    -- Maintain battery in peak condition.
    -- Follow proper starting procedures. Neutral, clutch in.

    Worn starter solenoid:
    -- Click from under seat but no cranking.
    -- Won't crank after rocking bike.
    -- Starter continues to run after bike starts and won't stop until the battery is disconnected.
    Failure mode:
    -- Internal contact damage resulting in non-conduction.
    -- Internal contact damage resulting in contacts welding shut.
    -- Internal damage/wear prevents solenoid core movement.
    Preventative Maintenance:
    -- None.
    Repair:
    -- Replace starter solenoid.
    Testing:
    -- For no cranking, short across solenoid high-power terminals. Normal operation denotes failed solenoid contacts.
     
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  6. GypsySOHMC

    GypsySOHMC Member

    Mar 18, 2019
    8
    8
    Stoke on Trent
    it started playing up last year. Would try and start it to go to work about 6.30 am and nothing, come back to it at 17.00 and it would start. Stripped the carbs etc as per the list have done now and it started. Started it a fortnight ago let it warm up and it started spitting as if running out of fuel and it hasn't started since
     
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  7. GypsySOHMC

    GypsySOHMC Member

    Mar 18, 2019
    8
    8
    Stoke on Trent
    I will get this thing started if it's the last thing I do. Only want it running so I can borrow it to a mate whose bike isn't finished
     
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  8. joe mc donald

    Subscriber

    Dec 26, 2014
    13,988
    1,000
    slough / burnham
    GypsySOHMC.
    Have you tried all the connections and hoses. Sounds like a air leak or blockage there somewhere. When you try in the morning it draws some fuel which works it way to the combustion chamber over a period of time then it will fire. Check the pump and do check the tank over flow pipe and cap for blockages. Try starting with the filler cap of see if it helps.
    Regards
    Joe.
     
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  9. GypsySOHMC

    GypsySOHMC Member

    Mar 18, 2019
    8
    8
    Stoke on Trent
    18,000 miles
    Oil, filter, plugs changed every 1000 miles since I've owned it. Having said that it's only done 5000 miles since I've owned it because it won't start reliably enough for it to be usable on a day to day basis.
     
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  10. GypsySOHMC

    GypsySOHMC Member

    Mar 18, 2019
    8
    8
    Stoke on Trent
    No blockages, fuel filter fitted ,carbs have been cleaned 4 or 5 times.
    Plugs were wet when I took them out to check them do fuel is getting through
    Brilliant spark on all 3 plugs.
    Just not even attempting to fire
     
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  11. GypsySOHMC

    GypsySOHMC Member

    Mar 18, 2019
    8
    8
    Stoke on Trent
    Non of the above they have all been checked and if any doubt replaced.
     
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  12. GypsySOHMC

    GypsySOHMC Member

    Mar 18, 2019
    8
    8
    Stoke on Trent
    I'm just hoping someone thinks of something I've missed. But up to now it's everything I've already done, checked or replaced.
     
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  13. Havit

    Havit Admin
    Staff Member Subscriber

    Jul 17, 2015
    9,568
    1,000
    Kent
    The bike needs fuel and a spark, if it has not got either one of them theirs your problem ;)
     
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  14. Sprinter

    Sprinter Kinigit

    Aug 17, 2014
    6,027
    1,000
    uk
    Crank position sensor on a 98?
     
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  15. Sprinter

    Sprinter Kinigit

    Aug 17, 2014
    6,027
    1,000
    uk
    Have you physically cleaned or replaced the primary jets?
    Have you confused the leads order?
    The starting issue could be the same as before or a different one
     
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  16. Rich Bryce

    Rich Bryce Dead Eye Dick

    Sep 18, 2015
    2,987
    1,000
    Bedford
    Welcome aboard mate. I hope you get the problem sorted soon.
     
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  17. GypsySOHMC

    GypsySOHMC Member

    Mar 18, 2019
    8
    8
    Stoke on Trent
    Got fresh fuel, spark and compression but nothing not even trying
     
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  18. GypsySOHMC

    GypsySOHMC Member

    Mar 18, 2019
    8
    8
    Stoke on Trent
    All jets were removed and cleaned.
    Plugs and leads were done one at a time
     
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  19. GypsySOHMC

    GypsySOHMC Member

    Mar 18, 2019
    8
    8
    Stoke on Trent
    New one fitted and air gap set at .8
     
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  20. Tricky-Dicky

    Tricky-Dicky Crème de la Crème

    Dec 12, 2016
    2,445
    1,000
    Norfolk UK
    If it has fuel and a adequate spark and the ignition timing is correct then have you compression tested it? is it possible that it needs re-shimming (tight) or valve timing is out? broken valve spring? the fact that it has started seems to say otherwise, could it be down to non continues fuel supply IE vacuum tap fault?
    just throwing i few thoughts around.
     
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