Question about 2005 Honda Dio

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*** follow up problem

Thanks mr. Benimur,
one thing, I already pre mix the 2t & the gasoline, what I observe is that in the event that the engine is already cooled down overnight, it is very hard to restart the engine...i already cleaned the carburator very well, but still same problem everyday... and I can't low down the rpm idle of the engine...

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  • rgonz Jan 31, 2009

    thanks mr. benimur,
    i think my 2t pump is deffective, thats why I pre mix, how can I check if my 2t pumpis working properly?


  • rgonz Jan 31, 2009

    thanks again mr. benmur,
    now I've got the idea of solving my problem...
    TNX...fixya...
    great help!


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Hi again,

Hard starting could be caused by:

  • vacuum leak (specially since you can not adjust idle lower). Was the original 2T oil injector to the carb plugged?
  • 2T oil pooling at the bottom/bowl of the carb (specially since you are using pre-mix);
  • the sparkplugs fouls fast/easily. You can try changing the plugs in the morning before you start.
Imagine the scenario of the original arrangement of the carb & 2T oil (not pre-mix); on initial start/early morning, gasoline would be drawn in first without much 2T. This ensures that the engine fires. When it is already running, that would be the only time the oil pump will work and therefore inject the 2T to the carb to mix with the fuel drawn inside the combustion chamber. With pre-mix, the first gasoline used (inside the carb's bowl) has already oil mixed.

Good luck and thank you for using FixYa.

Posted on Jan 31, 2009

  • Louie  Role
    Louie Role Jan 31, 2009

    When the engine is running, remove the small hose from the pump going to the carb. If it is working, then oil would be flowing not strongly but consistently. If you rev the engine, the flow would be stronger.

    Cheers.

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NSR mc21


Hi again,

Am glad that your bike runs now albeit the 7K flatspot. I have to agree that if you have a pre-mix in the tank and the 2T oil pump is already working, the fuel mixture tends to be harder to burn and would produce a smoky exhaust. Even having said this, I beg to disagree that this would be the cause of the hesitation/flatspot on about 7K RPM. I suspect that you have an air leak somewhere, most probably before the carbs. This would be the airbox assembly, the collar/mating/coupling to the entrance of the carb or even the air filter itself (or more so in the absence of an air filter). You may want to check that no air can enter the carbs other than those that passes through the filter.

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