Thruxton Backfire

Discussion in 'Thruxton, Scrambler & Trident' started by tappers, Apr 25, 2018.

  1. tappers

    tappers Well-Known Member

    Nov 30, 2015
    91
    68
    west sussex.UK
    #1 tappers, Apr 25, 2018
    i am running my 15 plate 900 thruxton with the arrow 2 into 2 exhaust system with the baffle's out,it had the remap to suit,i use premium unleaded petrol,mainly on starting up it will occasionally produce a backfire,apart from that it seem's to be running fine,i may try the cheaper standard unleaded,this all started when i never used it for a while over the winter month's & ended up dumping the fuel in the tank as it was running rough to say the least.i've ran the fuel tank LOW & refuelled about 4 time's since.it doesn't backfire every time i start it, it's only occasional.
     
  2. FarkyNell

    FarkyNell Well-Known Member

    Aug 17, 2016
    80
    68
    manchester
    #2 FarkyNell, Apr 25, 2018
    Not sure what causes the problem but I run the same set up but only use normal unleaded, not the premium stuff. Never had any issues with back firing nor any issues with the fuel going off over winter?
     
  3. youngy

    youngy Active Member

    Oct 30, 2017
    38
    28
    Peterborough
    #3 youngy, Apr 27, 2018
    you really mean backfire ie through the airbox? or just a big bang from the exhaust? that banging is probably a weak charge not igniting in the cylinder, then firing off in the exhaust.
     
    • Useful Useful x 1
  4. tappers

    tappers Well-Known Member

    Nov 30, 2015
    91
    68
    west sussex.UK
    #4 tappers, Apr 27, 2018
    just a BIG bang from the exhaust, like a gun going off.
     
  5. youngy

    youngy Active Member

    Oct 30, 2017
    38
    28
    Peterborough
    #5 youngy, Apr 27, 2018
    so it's a weak mixture igniting in the pipe.
     
  6. Sprinter

    Sprinter Kinigit

    Aug 17, 2014
    5,995
    1,000
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    #6 Sprinter, Apr 27, 2018
    The spark fails to ignite the mixture which then ignites in the exhaust ( I think)
     
  7. tappers

    tappers Well-Known Member

    Nov 30, 2015
    91
    68
    west sussex.UK
    #7 tappers, Apr 28, 2018
    would
    would it be down to operator error,ie not starting using the choke.
     
  8. Sprinter

    Sprinter Kinigit

    Aug 17, 2014
    5,995
    1,000
    uk
    #8 Sprinter, Apr 28, 2018
    @youngy
     
  9. Sprinter

    Sprinter Kinigit

    Aug 17, 2014
    5,995
    1,000
    uk
    #9 Sprinter, Apr 28, 2018
    I had a backfire caused by a dodgy sparkplug
     
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