The thing that lets a lot of builds down is the dodgy job of wiring everything. If you want your bike to look professional then doing a few things can make your job look clean, and will also make it more reliable as you wont have wires all over the place loosely held together.
So to take power for a light bulb from the engine or not to is the question?
The answer is not to ! Why? Because by taking power from the engine
You are actually starving the engine of electricity needed to generate a spark.
It's as simple as that. Better to use an external power source for lights
like a rechargeable battery.
Moving on to good wiring practice. There are no definitive was to do it
but I thought id share some of my ideas with you.
6mm Heat shrink comes in many different colours and can be purchased off ebay
for next to nothing. You can give your wiring a neat finish by following the
steps below.
Before we get started you may want to take the white wire, fold it in half and insert
it into the sleeve. The white wire is used to add a 6v light bulb that is powered from the engine and it is not recomended that you use it, it is just much better to buy yourself an externally powered one.
Take one of the heat shrinks and cut it in half these will be used to cover the two connections of the CDI unit. The longer piece will be used to cover the base of the wiring coming from the engine for a nice and clean finish.
Connect the black wire of the kill switch into the blue or green wire of the engine, you can use some solder here if you like.
Connect the blue/green wire from the engine to the blue/green wire of the CDI unit and then connect the black wire of the engine to the black wire of the CDI unit. Now fix the red wire of the kill switch onto the frame by using the top bottle holder screw and the wiring is complete.
Also while your at it, why not cable tie your wires to the frame. Another good thing to do is seal the sleeve coming out from the bottom of the engine, I used epoxy resin on mine, but a good dollop of vaseline would do the job.
It would be a good idea to put the CDI inside some sort of small plastic bag to protect it from water too.
The pictures show how the kill switch should be wired up. Alternatively you could make yourself a much more efficient kill switch by putting a switch on the blue wire; this thread
here goes into a lot of detail in to making one. It puts less strain on your magneto therefore making your parts more reliable.
Any body else have any good ideas to add to this?
Fastboy