Blue wire Kill-switch/Anti-theft device.

Discussion in 'Electrical' started by fetor56, Feb 3, 2008.

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  1. fetor56

    fetor56 Guest

    For people who don't want to use(or don't trust) the white wire as a kill switch use the blue wire.In it's standard form the white wire carries a voltage which shorts the magneto to stop the engine.With the blue wire u can still have the white wire to run a taillight/headlight and still safely kill your engine.
    Simply disconnect your white wire kill switch portion and splice into the blue wire...put an on/off toggle switch anywhere u like.IF concealed it also acts as an anti-theft device.

    Recognition given to Large Filipino.

  2. Skyliner70cc

    Skyliner70cc Active Member

    I'm a little obtuse so I don't get it. How does a blue wire kill-switch prevent the bike from being pedalled away by a thief?
  3. This idea stemmed from a thread where the author (sorry. I forgot who) kept blowing magneto's. And I'm theorizing that the magneto's are failing because we are shorting it every time we push the kill button. It may be easier on the magneto if you just disconnect the blue wire using a toggle switch on the handlebar (and a SECOND hidden switch for the anti theft) This may in fact prolong the life of your magneto although I haven't any studies. I do know that other engines kill themselves by disconneting a curcuit rather than shorting it out.(example,your car)
    There's also the question though as to resistance. Would too long a blue wire going to the handlebar and back cause enough resistance to strain the magneto?
    If I wanted a switch (I took mine off purposely) I would probably put it inline with the wire.
    Fector,that's AWESOME! I bet you just did that. Does it work well?
    That's actually a perfect place for that switch. You can still reach it while riding.
    Last edited by a moderator: Feb 3, 2008
  4. fetor56

    fetor56 Guest

    They can still pedal it away(but they can't start it )

    Large Filipino:
    Yep your right man,i just did it thismorning after seeing your post...i was getting paraniod about the amount of ppl on MBc who were blowing their magnito's/CDI's.....WORKS PERFECT. :D
  5. gone_fishin

    gone_fishin Guest

    this is the coolest new HT idea i've seen in a while, and so simple it
    makes you wonder how anyone ever got around to it...

    yup, quit "killing" it altogether & just deprive the CDI with an inline toggle :)
    (is there such a thing as a momentary-off button?)

    this is a great contribution, guys :cool:


    i recommend an inline for your whitewire light, too.

    seems to me that the next logical step would be ground-strapping.

    seems to me the best security would be a hidden toggle that does ground the blue-signal.
    Last edited by a moderator: Feb 7, 2008
  6. Bigfoot

    Bigfoot Guest

    Can I use a 3 prong switch?

    I have one that has "power", "acc" (accessory to be powered), and a "ground" prong.

    Do I just splice the black wires from the CDI & the Magneto, to the ground?

    Or does one back wire have to be grounded on the frame?

    If so, which one?

    Which one to power?

    Which one to ACC?

    Holy carp I'm confused:shock::confused:
  7. Were not grounding anything here. The way the electricals are set up,pushing the kill button grounds out the white wire. Grounding the white wire is essentially shorting out the magneto!
    What were doing is having the wires just as they are. Connect coil to magneto Blue to Blue,Black to Black,white to accesories like lights or cap it off.
    Now on the blue wire,simply attach a toggle switch. No grounding. Wire to wire.
    When your running your bike just like in your car,the switch is ON. When you want to kill your engine,turn your switch OFF.
    The way happy time has it is all backwards. Push the button ON to short out the white wire.
    ....I dunno. Maybe it's a China thing. :D

    This is even the way motorcycles do it.
    Last edited by a moderator: Feb 13, 2008
  8. gone_fishin

    gone_fishin Guest

    by making light, you underestimate our trade-"partners" (not a personal dig, an observation on current events) & they are counting on that (research the issue)...i bet they make a lot more money selling individual magnetos.

    again, this "mod" makes so much sense it's a wonder anyone discovered it ;)
  9. This is exactly how the 49cc Honda 4 stroke motors (and the Hua Shueng copies) are set up. Someone here once referred to the white wire as "the white tormentor"...very fitting name.
  10. Scottm

    Scottm Guest

    I learned about shorting with lawnmowers. When you release the bail, the ground wire from the magneto is pressed against the flywheel.
  11. BSA

    BSA Guest

    You can get key switches, that would be really cool. I might try that out.

  12. OMG YES! Have a key switch IN YOUR FRAME with the wires inside and it would look so clean,man.
    Imagine people staring at you as you're fumbling with your keys and see you put one on your bike. That would just...that's too cool.
  13. fastboy9

    fastboy9 Member

    O yeah! how has it taken this long for us to notice! hmmm so glaringly obvious
  14. will_start

    will_start Member

    I'm so going to do this switch idea.
    Pulling out the spark plug is just such an unprofessional
    way of stopping your bike.

    Would it be possible to run a length of cable up to the handle-bar to the toggle switch
    and then back to the CDI.

    Question is: would that add too much resistance to the blue lead,
    and reduce the spark ? I guess a cable generally has no or really low resistance.

    I guess trying it is the only way to find out.

    I'll post any results.

    My 1.5 Cents (AU)

  15. fetor56

    fetor56 Guest

    About the only way your going to have too much resistance is if u made your wires a few miles long...i'm assuming your not gonna do that so take my word for it you'll be fine. :)
  16. will_start

    will_start Member

    thanks fetor.

    I bought a water-proof toggle (on/off) switch for $10 today, at lunch,
    from J-Car Electronics (in OZ).
    (I think I'm becoming obsessed, actually its past that stage.)

    Its 15 Amp rated, so no probs with it handling what the magneto will dish out.

    I'm going to mount it on the handle bar somewhere, and make use of the extra
    wire that came with the standard kill switch.
    (waste not want not...).

    As usual.
    I'll post pics when done.

  17. fastboy9

    fastboy9 Member

    great! look forward to seeing the outcome
  18. will_start

    will_start Member

    yesno switch

    I installed my water-proof yesno switch.

    Its my pet name ok!

    I attached it to the CDI , as it was quicker and the mosquito's were out.

    I may move it to the handle bar over time, as its quite hard
    to access it whilst riding.

    I usually get off and burn myself and then find the switch :evil:

    see attached pic.

    this works so easy, compared to pulling the spark plug cap.

    Attached Files:

  19. Scottm

    Scottm Guest

    Thanks for posting that Will. That's exactly what I had in mind to do too, it just took a while for me to understand. I'm the guy who will read books only if they have pictures in them LOL.
    Last edited by a moderator: Mar 12, 2008
  20. will_start

    will_start Member

    I know exactly what ya mean, I'll "read" a books pictures anyday,
    heaps better than the words...L0L

    I'm going to turn the 30 install pics into yet another stills Vid.
    I just love doing that.