Topic
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Running CDI direct from battery
I know it isn't strictly speaking an XL, but I am a bit stuck and thought this would be a good place to ask. I have a CB250RSA that I use as a sand racing bike. As it is a race bike I have taken the charging system/battery off the bike. The alternator output originally had 3 x yellow wires to the charging system - now junked - and a white and a blue wire direct to the CDI. The bike has run fine like this for a couple of years. I would like to run the CDI with battery power as it means I can lose the stator/flywheel and the associated weight. It also means there is one less moving part to go wrong. I established that the bike would run fine with only the blue alternator output wire connected to the CDI so what the white wire does is a mystery to me. (The pulse generator wires and CDI earth are still in place, the ignition switch wire is connected to a lanyard cut out.) I connected the blue CDI input to 12v DC battery (the RS is 12v) = one spark only. Re-connected the blue CDI input to alternator power = no sparks. Connected a different CDI unit to the alternator power (blue wire only) = sparks again. So I have killed 1 x CDI and am not much wiser. The things I had read previously indicated that getting enough power from a battery to power a CDI would be a problem - I guess not in this case. If any one has any ideas they would be appreciated. Thanks, Russ |