(Date Posted:10/05/2006 8:32 PM)
I have ~4 SL/CB 125 and 100 engines laying around and AFAIK they all use battery vs. 'exciter' coil like the XLs. Could be none are newer then ~1972.
*BUT* my SL125 came to me w/o a battery and hot wired. All they did was strip some wire off the hot lead going to the lights and splice the coil wire onto that.
I don't have an SL125 schematic and the SL has since been rewired/new engine.
The battery in a stock SL works as a load resistance to protect the system from over voltage and I figure the wiring the coil into the lights performed a similar function with the bulb acting as a load.
Anyway, I would suggest you try running a wire from the positive terminal of the battery to the coil and seeing if you get a spark. If you do get a spark and the motor runs, use a DVM to check for how much voltage is appearing at the coil. If the voltage is excessive, just wire a ~10 watt 2 Ohm resistor in series.
If you don't get a spark with the battery charging circuit you may want to try it with the lighting circuit. Same problem and solution if there is an over voltage problem.
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