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Help Bike will only start with fuel poured down carbs

Discussion in 'Yamaha 250cc In-Line 4's' started by lpg, Sep 5, 2015.

  1. lpg

    lpg Member

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    Hey guys,

    My 1991 fzr250 3ln3 wont start unless I pour a little bit of fuel down the carbs and will burn that up then stop. Wont run off the fuel tank. It doesn't have a fuel pump. Please help thanks.
     
    lpg, Sep 5, 2015
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  2. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    Have you checked to see that fuel is flowing from the tap?
    Is your fuel filter blocked?
     
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    Murdo, Sep 5, 2015
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  3. lpg

    lpg Member

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    The fuel tap is bypassed and fuel gets to the carbs because they had a small leak one of them and its leaking a tiny bit.
     
    lpg, Sep 5, 2015
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  4. risky

    risky risky

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    might need knew fuel line if e10 has been run in it or the carbs may have internal corrosion.
     
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    risky, Sep 6, 2015
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  5. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    Next step is carbs off for a through clean and new seal kit from Litetek.
     
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    Murdo, Sep 6, 2015
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  6. lpg

    lpg Member

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    fuel line is good and carbs are good inside. cleaned bowls and checked the jets and they aren't blocked, made sure the idle screw is the 3 turns out.
     
    lpg, Sep 6, 2015
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  7. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    Are the chokes working?
     
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    Murdo, Sep 6, 2015
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  8. lpg

    lpg Member

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    the choke is fine I pulled it across with my fingers and it slide fine
     
    lpg, Sep 6, 2015
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  9. risky

    risky risky

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    compression test and check valve clearances.
     
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    risky, Sep 6, 2015
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  10. lpg

    lpg Member

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    okay I cant do either of those but I guess I will have to learn! when I try and start it there is little bit of white smoke coming out the exhaust
     
    lpg, Sep 6, 2015
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  11. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    How old is your fuel?
    If it more than a couple of weeks, ditch it and try some fresh 95.
     
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    Murdo, Sep 6, 2015
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  12. lpg

    lpg Member

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    got fresh fuel.
     
    lpg, Sep 6, 2015
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  13. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    Are plug wires on the correct order? One coil fires 1 and 4, the other 2 and 3.
     
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    Murdo, Sep 6, 2015
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  14. lpg

    lpg Member

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    not sure I think so but how could I check?
     
    lpg, Sep 6, 2015
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  15. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    You will need to find each lead from the coil end and follow it to the spark plug/motor end

    To put it another way .... 2 leads from 1 of the coils will go the the outside spark plugs and the other 2 leads from the other coil will go to the 2 middle plugs.
     
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    GreyImport, Sep 8, 2015
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  16. lpg

    lpg Member

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    Thanks for all the replies but I fixed the problem put new spark plugs in


    Sent from my iPhone using Tapatalk
     
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    lpg, Sep 8, 2015
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  17. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    The other thing u can do in that area is unscrew the plug caps off the leads and cut a couple of mms off the lead and give the cap some clean new wire to connect with.
     
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    GreyImport, Sep 8, 2015
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  18. lpg

    lpg Member

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    Thanks for the tip!


    Sent from my iPhone using Tapatalk
     
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    lpg, Sep 8, 2015
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