/ Register

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

    Messages:
    22
    Likes Received:
    5
    Trophy Points:
    13
    Joined:
    Sep 5, 2015
    Gender:
    Male
    Location:
    Queensland
    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
    #1
  2. Murdo

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

    Messages:
    6,406
    Likes Received:
    4,795
    Trophy Points:
    1,148
    Joined:
    May 4, 2013
    Gender:
    Male
    Occupation:
    Retired
    Location:
    Tamworth, NSW
    My Bike:
    1937 Royal Enfield 250, CF Moto 250 V5, Honda's XL250, CBR250, FT500 plus a few others.
    Have you checked to see that fuel is flowing from the tap?
    Is your fuel filter blocked?
     
    • Like Like x 1
    Murdo, Sep 5, 2015
    #2
  3. lpg

    lpg Member

    Messages:
    22
    Likes Received:
    5
    Trophy Points:
    13
    Joined:
    Sep 5, 2015
    Gender:
    Male
    Location:
    Queensland
    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
    #3
  4. risky

    risky risky

    Messages:
    4,555
    Likes Received:
    1,177
    Trophy Points:
    923
    Joined:
    Nov 4, 2012
    Gender:
    Male
    Occupation:
    risky by name AND actions
    Location:
    newcastle,australia
    My Bike:
    honda ca77, megelli x2,fzr yamaha x 5 ,maxim,cb750.cb600 hornet,zxr250,marusho magnum electra.
    might need knew fuel line if e10 has been run in it or the carbs may have internal corrosion.
     
    • Like Like x 1
    risky, Sep 6, 2015
    #4
  5. Murdo

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

    Messages:
    6,406
    Likes Received:
    4,795
    Trophy Points:
    1,148
    Joined:
    May 4, 2013
    Gender:
    Male
    Occupation:
    Retired
    Location:
    Tamworth, NSW
    My Bike:
    1937 Royal Enfield 250, CF Moto 250 V5, Honda's XL250, CBR250, FT500 plus a few others.
    Next step is carbs off for a through clean and new seal kit from Litetek.
     
    • Like Like x 1
    Murdo, Sep 6, 2015
    #5
  6. lpg

    lpg Member

    Messages:
    22
    Likes Received:
    5
    Trophy Points:
    13
    Joined:
    Sep 5, 2015
    Gender:
    Male
    Location:
    Queensland
    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
    #6
  7. Murdo

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

    Messages:
    6,406
    Likes Received:
    4,795
    Trophy Points:
    1,148
    Joined:
    May 4, 2013
    Gender:
    Male
    Occupation:
    Retired
    Location:
    Tamworth, NSW
    My Bike:
    1937 Royal Enfield 250, CF Moto 250 V5, Honda's XL250, CBR250, FT500 plus a few others.
    Are the chokes working?
     
    • Like Like x 1
    Murdo, Sep 6, 2015
    #7
  8. lpg

    lpg Member

    Messages:
    22
    Likes Received:
    5
    Trophy Points:
    13
    Joined:
    Sep 5, 2015
    Gender:
    Male
    Location:
    Queensland
    the choke is fine I pulled it across with my fingers and it slide fine
     
    lpg, Sep 6, 2015
    #8
  9. risky

    risky risky

    Messages:
    4,555
    Likes Received:
    1,177
    Trophy Points:
    923
    Joined:
    Nov 4, 2012
    Gender:
    Male
    Occupation:
    risky by name AND actions
    Location:
    newcastle,australia
    My Bike:
    honda ca77, megelli x2,fzr yamaha x 5 ,maxim,cb750.cb600 hornet,zxr250,marusho magnum electra.
    compression test and check valve clearances.
     
    • Like Like x 1
    risky, Sep 6, 2015
    #9
  10. lpg

    lpg Member

    Messages:
    22
    Likes Received:
    5
    Trophy Points:
    13
    Joined:
    Sep 5, 2015
    Gender:
    Male
    Location:
    Queensland
    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
    #10
  11. Murdo

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

    Messages:
    6,406
    Likes Received:
    4,795
    Trophy Points:
    1,148
    Joined:
    May 4, 2013
    Gender:
    Male
    Occupation:
    Retired
    Location:
    Tamworth, NSW
    My Bike:
    1937 Royal Enfield 250, CF Moto 250 V5, Honda's XL250, CBR250, FT500 plus a few others.
    How old is your fuel?
    If it more than a couple of weeks, ditch it and try some fresh 95.
     
    • Like Like x 1
    Murdo, Sep 6, 2015
    #11
  12. lpg

    lpg Member

    Messages:
    22
    Likes Received:
    5
    Trophy Points:
    13
    Joined:
    Sep 5, 2015
    Gender:
    Male
    Location:
    Queensland
    got fresh fuel.
     
    lpg, Sep 6, 2015
    #12
  13. Murdo

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

    Messages:
    6,406
    Likes Received:
    4,795
    Trophy Points:
    1,148
    Joined:
    May 4, 2013
    Gender:
    Male
    Occupation:
    Retired
    Location:
    Tamworth, NSW
    My Bike:
    1937 Royal Enfield 250, CF Moto 250 V5, Honda's XL250, CBR250, FT500 plus a few others.
    Are plug wires on the correct order? One coil fires 1 and 4, the other 2 and 3.
     
    • Like Like x 1
    Murdo, Sep 6, 2015
    #13
  14. lpg

    lpg Member

    Messages:
    22
    Likes Received:
    5
    Trophy Points:
    13
    Joined:
    Sep 5, 2015
    Gender:
    Male
    Location:
    Queensland
    not sure I think so but how could I check?
     
    lpg, Sep 6, 2015
    #14
  15. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

    Messages:
    10,931
    Likes Received:
    6,723
    Trophy Points:
    1,168
    Joined:
    Jun 14, 2012
    Gender:
    Male
    Occupation:
    Between a Rock and a Hard Place
    Location:
    North by NW NSW Oztralia - Tamworth
    My Bike:
    *Kawasaki ZXR250C *Yamaha FZR250R 3LN1 *Yamaha FZR400 *Triumph Bonneville 750 T140V *Triumph Daytona 675 *Triumph Tiger 800XC
    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.
     
    • Like Like x 1
    GreyImport, Sep 8, 2015
    #15
  16. lpg

    lpg Member

    Messages:
    22
    Likes Received:
    5
    Trophy Points:
    13
    Joined:
    Sep 5, 2015
    Gender:
    Male
    Location:
    Queensland
    Thanks for all the replies but I fixed the problem put new spark plugs in


    Sent from my iPhone using Tapatalk
     
    • Like Like x 3
    lpg, Sep 8, 2015
    #16
  17. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

    Messages:
    10,931
    Likes Received:
    6,723
    Trophy Points:
    1,168
    Joined:
    Jun 14, 2012
    Gender:
    Male
    Occupation:
    Between a Rock and a Hard Place
    Location:
    North by NW NSW Oztralia - Tamworth
    My Bike:
    *Kawasaki ZXR250C *Yamaha FZR250R 3LN1 *Yamaha FZR400 *Triumph Bonneville 750 T140V *Triumph Daytona 675 *Triumph Tiger 800XC
    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.
     
    • Like Like x 1
    GreyImport, Sep 8, 2015
    #17
  18. lpg

    lpg Member

    Messages:
    22
    Likes Received:
    5
    Trophy Points:
    13
    Joined:
    Sep 5, 2015
    Gender:
    Male
    Location:
    Queensland
    Thanks for the tip!


    Sent from my iPhone using Tapatalk
     
    • Like Like x 1
    lpg, Sep 8, 2015
    #18
Tags:

Share This Page