Kill switch

[BikerMatt]

Hi, just wondering why the CBR 125 wasn't made with a kill switch and whether you could install one. I read the manual and it mentioned there were CBR 125's with and without kill switches but googling this, nothing pops up.

Notice how I said wondering

Thanks
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So many bikes..

[Nobby the Bastard]

It's easy to fit a kill-switch, just work out which of the wires going to the ignition cut the engine and put a switch in line with one of the wires.

Whats more relevant is why you feel the need to have a kill switch.

To be honest, they are irrelevant. You'll instinctively pull the clutch if your engine won't stop and you need to stop moving and you'll instinctively switch it off at the ignition if the engine needs to be stopped. if you aren't moving.
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

[BikerMatt]

[gavcarter]

[bladerunner]

Kill switches do have there use in an emergency if your throttle should happen to stick open but tbh on a low power 125 4t the back brake can also be used to stall the engine if needed.even in a low gear..more a fail safe on bikes that over power the back brake but easy enough to fit an after market mx type switch to the handle bars....just needs a wire from the low tension side of the coil and the other wire to an earth on the frame...if you push the switch it earths the power going to the coil meaning no spark. £8 for an after market type that includes handle bar mount and wires already fitted.
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Current bikes...cbr929, KDX200's, Rd125lc mk2, RGV250's

[smegballs]

Check your wiring diagram before fitting.

Earthing the power "going to" the coil results in a short! You want to be earthing the cold side of the coil.

For example I know lots of old yamahas had the hot end of the HT coil permanently attached to the ignition controlled live, and the TCI unit controlled the ground side of the coil on and off to make the spark.

In such a case fitting a switch between the hot side of the coil and ground would make a short circuit. It would probs stop the engine - by blowing the main fuse!

Putting a switch between the cold side of the coil and ground would work in such a case, as it would mean the coil was permanently "on" despite what the TCI was doing. As such there would be a steady current through the coil = constant magnetic field = no induced sparks.

If you post up a wiring diagram of the bike concerned I'll take a look for you and work out what is happening?

[gavcarter]

[gavcarter]

pinched this off another forum post ignore the indicator being highlighted. The switch should be installed as shown in red.

[smegballs]