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86 honda trx200sx no spark

Old 06-12-2018, 10:41 AM
Weekend Warrior
Thread Starter
Join Date: Jun 2018
Posts: 1
Default 86 honda trx200sx no spark

Recently acquired a couple old Hondas, one is a 82 185s (ill get to that one in another thread) and one is an 86 trx200sx. So as the title says, no spark. I have tried to solve the problem by throwing parts at it. Replaced plug, wire/coil, cdi, key switch, and battery. I have also tried bypassing the kill switch (not sure if it works by opening on closing a circuit so I tried it both ways). Has compression, gets fuel (plus I tried starting fluid). No spark. If you remove the plug from the head and crank there is no spark at all. Is there a fuse or fusible link somewhere that I am missing? ANy other suggestions?
Old 06-13-2018, 02:50 AM
Extreme Pro Rider
Join Date: Oct 2013
Location: Lancaster England
Posts: 3,552

Most likely either exciter, or trigger coil failure. Always check the ignition system out before "throwing parts at it". Honda, back then, were recommending resistance tests for electronic components, I find this mostly a waste of time but trigger coil (pulse generator) 20 to 40 ohms, exciter 100 to 400 ohms, I go for open circuit = bad, dead short = bad anything in between may be OK, and with the voltage set to AC on your meter, see if spinning the engine over produces voltage from exciter and trigger coils.
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