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Thread: Engine won't start - backfires out the exhaust

  1. #16
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    Quote Originally Posted by quickbuck View Post
    Ummm, DB, why do that if there is "No Liquid in the Cylinders"?
    AND if there IS liquid, you are asking for a FIRE!

    So, don't be doing that.
    No you do that to clear the cylinders. It's completely trivial to disable the ignition.

    Steve
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    "Wow, Great advise there DB."
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  2. #17
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    Quote Originally Posted by kwaka_crasher View Post
    I hope you're taking the piss... EH means it's only a partial thread (1/2" of thread on a 3/4" reach plug) as opposed to just E which means it's a fully threaded 3/4" total thread reach.
    Yea, I was taking the piss, I meant to say the E stands for expensive, the the H for honda, but forgot where I was at when I wrote that!

  3. #18
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    Quote Originally Posted by DangerousBastard View Post
    No you do that to clear the cylinders. It's completely trivial to disable the ignition.

    Steve
    Sorry Steve, on this you are mistaken.

    It is most certainly not "trivial" to disable the ignition.

    I was a motorcycle mechanic for 13 years, and twice I saw small (thankfully) fires started by (experienced) mechaincs doing exactly that.

    also, if the plugs are not earthed, and the ignition is operated, you can very easily destroy a coil, or even a CDI.

    It' been done!

  4. #19
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    Quote Originally Posted by SS90 View Post
    I was a motorcycle mechanic for 13 years, and twice I saw small (thankfully) fires started by (experienced) mechaincs doing exactly that.

    It' been done!
    Yup, and I have done it myself. Why not pull the plug off the ignition pickup?

    Steve
    "I am a licenced motorcycle instructor, I agree with dangerousbastard, no point in repeating what he said."
    "read what Steve says. He's right."
    "What Steve said pretty much summed it up."
    "I did axactly as you said and it worked...!!"
    "Wow, Great advise there DB."
    WTB: Hyosung bikes or going or not.

  5. #20
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    Quote Originally Posted by DangerousBastard View Post
    Yup, and I have done it myself. Why not pull the plug off the ignition pickup?

    Steve
    Erm, but that is "disabling the ignition system......."

  6. #21
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    Quote Originally Posted by SS90 View Post
    Erm, but that is "disabling the ignition system......."
    Well, not exactly.... There is still a chance that the spark will jump from the end of the lead to the engine.
    Yes, I've seen it done by experienced mechanics too! And almost saw a YZ250 get absolutely toasted.

    Admittedly the whole engine was fill of fuel, but fact remains, it only takes a vapour of the correct fuel/ air ratio with a high energy spark at the right time to start the fire.
    Murphy says it will happen when you least want it to. Especially after trying to get if to work under the correct conditions... ie internally!

  7. #22
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    Quote Originally Posted by DangerousBastard View Post
    Yup, and I have done it myself. Why not pull the plug off the ignition pickup?
    How would that not be classed as disabling the ignition?
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  8. #23
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    Quote Originally Posted by kwaka_crasher View Post
    How would that not be classed as disabling the ignition?
    LOL who gives a fuck. Ya just want the fucker to stop sparking somehow so it doesn't ignite the fuckin flammable shit that is spewing everywhere. If ya can't shut down the high-tension site, ya shuts down the fuckin LOW tension side.

    Fuck me, all this rocket science is too technical for me... UN PLUG THE FUCKAHHHHH...

    Steve
    "I am a licenced motorcycle instructor, I agree with dangerousbastard, no point in repeating what he said."
    "read what Steve says. He's right."
    "What Steve said pretty much summed it up."
    "I did axactly as you said and it worked...!!"
    "Wow, Great advise there DB."
    WTB: Hyosung bikes or going or not.

  9. #24
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    Quote Originally Posted by DangerousBastard View Post
    LOL who gives a fuck. Ya just want the fucker to stop sparking somehow so it doesn't ignite the fuckin flammable shit that is spewing everywhere. If ya can't shut down the high-tension site, ya shuts down the fuckin LOW tension side.

    Fuck me, all this rocket science is too technical for me... UN PLUG THE FUCKAHHHHH...
    Dude! You're the one that said it was trivial!
    This is my signature. There are many like it, but this one is mine. My signature is my best friend. It is my life. I must master it as I must master my life. Without me, my signature is useless. Without my signature, I am useless.

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  10. #25
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    Quote Originally Posted by quickbuck View Post
    Well, not exactly.... There is still a chance that the spark will jump from the end of the lead to the engine.
    Yes, I've seen it done by experienced mechanics too! And almost saw a YZ250 get absolutely toasted.

    Admittedly the whole engine was fill of fuel, but fact remains, it only takes a vapour of the correct fuel/ air ratio with a high energy spark at the right time to start the fire.
    Murphy says it will happen when you least want it to. Especially after trying to get if to work under the correct conditions... ie internally!
    Erm, what do you mean quickbuck?

    Disconnecting the pickup lead will completley stop any spark happening whatsoever.

    Think about it.

    If the pickup lead is disconnected, the coil can't fire.

  11. #26
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    take it to the bike shop and let them fix it , no hassles !( and i aint no L plate rider!)

  12. #27
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    Just about CV carb comments thus far. What? I have CV carbs with accelerator pumps and the choke closes the vacuum slide.. Unless Keihin (I assume those are on the Honda) are vastly different to Mikuni.
    I agree with the charging the battery and getting some fresh plugs. Seems strange that it worked for the test ride fine from cold with no choke. Personally, it sounds a little rich (like the air filter is a little clogged).

  13. #28
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    Quote Originally Posted by meowmix View Post
    Just about CV carb comments thus far. What? I have CV carbs with accelerator pumps and the choke closes the vacuum slide..
    So, when you open the throttle, little jets of fuel squirt into the cylinders, even when the engine is switched off?

  14. #29
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    Quote Originally Posted by meowmix View Post
    Just about CV carb comments thus far. What? I have CV carbs with accelerator pumps and the choke closes the vacuum slide..
    So, when you open the throttle, little jets of fuel squirt into the cylinders, even when the engine is switched off?

  15. #30
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    Quote Originally Posted by meowmix View Post
    Just about CV carb comments thus far. What? I have CV carbs with accelerator pumps and the choke closes the vacuum slide.. Unless Keihin (I assume those are on the Honda) are vastly different to Mikuni.
    They are vastly different.

    Quote Originally Posted by SS90 View Post
    So, when you open the throttle, little jets of fuel squirt into the cylinders, even when the engine is switched off?
    Yes. I'd actualy forgotten about this myself. I mean, who fuck uses Keihins!

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