125 fuel problem
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Thread: 125 fuel problem

  1. #1
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    125 fuel problem

    Hello,

    I am Joris and I have a 125 cross. I have a small problem with it which I can't get my head around. Maybe someone here has advise?



    1. Engine completely rebuild at a friends place (mechanic)
    2. Cleaned the carburateur


    Problem: no fuel in to the engine.

    Checked: fuel chamber in carb is full. Checked the carb again completely again. Looks al fine.

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  2. #2
    Senior Member R Powell's Avatar
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    Richard Powell
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    Hi have you tried a little fuel down the spark plug hole to see if the engine runs for a few seconds? This will establish that the ignition is working ok before checking the carburetor. Did you have the choke lever on? mine doesn’t start without choke on for about 30 seconds. If this fails recheck the choke jet on the carburretor it may still have a blockage!
    hope this helps
    The Benelliman
    1981 Benelli Sei 900
    1989 Benelli Sei 900
    1976 Benelli 125 Enduro
    1981 Benelli 250 2c
    1976 Benelli 250 Quattro
    1992 Ducati. 907 ie

  3. #3
    GBo
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    Are you getting a wet plug? You could have a seal leak so that air is being pulled in from the alternator or gearbox. Plenty of compression? Piston on the right way round? I would try as suggested a little fuel in the plug hole or squirt “Bradex Easy Start“ or that Ozzy stuff “Start Ya Bastard” Into the inlet. Checked all the jets?

    looks lovely though.

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  5. #4
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    Thank you for the replies.

    1. Yes I tried fuel directly threw the spark plug. Nothing happend.
    2. Compression is good and tested.
    3. Piston right way round, yes.
    4. All jets are clean.
    5. Spark plug spark good.
    6. Choke lever on, yes.
    Again thank you for the replies.

    A. When I kickstart the engine just turns barrely round, 2/3 times. Is that normal? Without sparkplug it goes much more round.
    B. Fuel comes out at the air intake side and threw the small overload holes on the site when I kickstart. That is not normal I think?

    Kind regards,

  6. #5
    GBo
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    Sounds like the carb is flooding. Take off float bowl, look at needle valve and check float is not full of fuel. You should be getting a wet plug if that’s the case

  7. #6
    GBo
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    Is it a piston port or disc valve engine?

  8. #7
    Senior Member R Powell's Avatar
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    The engine is piston port, I would check that the woodruff key has not sheared of and made the timing wrong?
    benellioldman likes this.
    The Benelliman
    1981 Benelli Sei 900
    1989 Benelli Sei 900
    1976 Benelli 125 Enduro
    1981 Benelli 250 2c
    1976 Benelli 250 Quattro
    1992 Ducati. 907 ie

  9. #8
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    Thank you,

    Today I am going to check the floaters and the woodruff key. How do I check the woodruff key?

  10. #9
    GBo
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    Can you move the flywheel on the shaft? Does the tdc mark line up with the piston at the top looking down spark plug hole?
    Rick67 likes this.

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