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Fuel blockage issue

Discussion in 'Kawasaki 250cc Twins' started by Sandra, Apr 4, 2016.

  1. Sandra

    Sandra Active Member

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    i seen to have no fuel getting to the piston chamber in my zzr now. I left i covered up under the carport over the easter weekend and it wont start. Have the plugs out right side plug was black and the left side was not much better, so new plugs again, tried to start the bike but still not going. Pulls the new plugs back out and the are still clean, no fuel smell on them. I can here the carbies working and the motor trying to start.

    Have about half a tank of fuel, new fuel filter. But not sure what to try next.

    The bike shop want $60 just to pick it up and i am only 4ks from them.
     
  2. Linkin

    Linkin The Apprentice Premium Member Dirty Wheel Club Contributing Member

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    When did you put in the new fuel filter and what brand/type is it.

    I bought a small Ryco fuel filter with an opaque plastic housing and could not get it to work with the FZR's fuel pump/carbs, it simply would not let fuel flow through in either direction.

    I tossed that filter in the bin and used one of clear case ones from supercheap, with the orange filter element. It's a bit bigger but it works with carbs and low pressure fuel pumps.

    Also check that you haven't left the fuel tap on PRI (prime) instead of ON or RES if your fuel tap has that.

    Since your plugs were black I would suggest that you open the oil filler cap and smell the oil. If you can smell fuel in the oil, you have fuel getting past the intake valves and piston rings. Usually this means you need to adjust the float height in the carbs, or the float needles are worn out/stuck open. An old trick is to tap the carb bowls with the handle of a screwdriver to un-stick the floats.

    Also you will want to change the oil if the is fuel in it, fuel and oil will mix and eat away the bearings if you don't rectify the problem.
     
  3. Sandra

    Sandra Active Member

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    I fully rebuilt the motor back in Jan '14, its only done about 30,000ks since then, but i handed the bike to my local bike shop to do the carbies.

    The carbies were cleaned a few weeks ago.

    No change in the feul economy still get 450k for $20.

    It is up for an oil change.
    And no fuel smell in the oil

    The only thing i dont get is why it was running fine ( rode to Gunnedah/Tamworth and back to Newcastle) let it sit over the easter weekend and now it wont start
     
  4. Sandra

    Sandra Active Member

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    clear plastic fuel filter is from the bike shop.

    The fuel tap has always been set on Reserve ever since i brought it.
     
  5. Linkin

    Linkin The Apprentice Premium Member Dirty Wheel Club Contributing Member

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    OK that is a bit strange. My advice is to put the fuel tap on prime and try to start it. You might have a small leak from the carbs or fuel system, or leaky float needles letting the fuel drain out and evaporate over time.

    Another thing is heating and cooling of the fuel tank can produce a vacuum. If the tank breather is blocked it is possible that the carbs will not be able to suck any fuel through. Have you opened the fuel tank cap at all since parking the bike?

    Do those 2 things and if you can't get it going, the next thing to try would be a clutch start.
     
  6. Sandra

    Sandra Active Member

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    Strange indeed.

    Float seals have been replaced, needles cleaned.

    No fuel leaks from the fuel system,
    Open the tank again this morning to check the fuel level, the tNk breather is clear.
     
  7. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Pull off the fuel hose at the carbies and stick it in a jar and see wat happens with each position of the fuel tap and with the tank cap closed and open

    Fuel filter on in the right direction?
     
  8. Sandra

    Sandra Active Member

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    A piece of filter was in the hose that is below the inline filter ( but not part of it) dont know how it got there and neither does the bike shop.

    But atleast the bike is going again and its off to the bike shop tomorrow
     
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