Motorcycle Club » Star 1100 Classic & Custom

bike wouldn't start

6 posts from 5 voices
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  1. pill2304
    #

    went to get on my bike yesterday after i had rode to a friends house .it started and went dead so i gave it a little gas and that was the wrong thing to do.i guess i flooded the carbs let it sit awhile and tried it with no gas and it fired right up

  2. Sduplyumbr
    #

    My bikie is the same way, it doesn't need any gas starting when it is warm.

  3. ModoHero
    #

    How ya doin'? Unless you have "pumper" carbs the handle on the right should be called "giving it air" not "giving it gas".

    Eventhough you twist it, nothing really happens regarding fuel. The twisting of the throttle opens the slides which control air intake. It is at its richest setting when you crank it without touching the throttle cuz the opening is the smallest and the air goes much faster to get through. When a bike is flooded the way to clear it is open the throttle all the way to let in tons of air and little fuel. Wide open means big hole and low velocity.

    Sorry, I know you didn't ask for diagnosis, but as a Dr. that giving "gas" thought messes folks up.

    Dwayne

  4. vakonman
    #

    Hey ModoHero,
    I've have a question about compression testing a cylinder and carb involvement in the test. I been told to have the throttle wide open when performing the test. I assume that was to make sure that pressure would not escape somehow through the carb. Now, your solution to clear a flooded carb is: "When a bike is flooded the way to clear it is open the throttle all the way to let in tons of air and little fuel. Wide open means big hole and low velocity." Does this "big hole" not allow the pressure to escape? Can you explain what is accomplished by WOT on compression tests?

  5. frok
    #

    WOT when checking cyl pressure is so that only a minimal amount of fuel gets in and dosent give false readings....and fuel blowing back into your face isnt good either....Pressure wont go back out of the carbie's cause the valves will both be closed on the upstroke of the piston causing the air to only escape out of the spark plug hole...to get right pressure reading you have to let the piston and valves to run thru a couple of cycles.....

  6. vakonman
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    Thanks for the lesson frok. Your explanation makes perfect sense. Out of curiosity I tried a compression test on a known good cylinder without the WOT. It maxed-out at only 90 psi. With WOT it achieved 150 psi. Tells me that WOT for a compression test is an absolute requirement.

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