Re: No spark

Posted by LukeM on
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/No-spark-tp1726168p1727835.html

That would explain why one pair of plugs isn't sparking.  If the other point set is opening when it should, you should be able to see spark on the plugs.  Get the Factory Service Manual for your motor, and go through the points adjustment process a few times.  You should be able to get pretty close with static adjustments.  Dialing it in will take a little patience, but that will come later.

What basically happens is when the points open, the voltage change across the points induces a voltage change on the low side of the coil.  When that change goes through, the spark level voltage is induced on the high side of the coil.  It then discharges across 2 of the 4 spark plugs.  While it does fire both plugs, on the one NOT on the compression/power stroke, it's wasting the spark on the exhaust portion of the cycle.  It just saves the complexity of a distributor.

Look for loose wires (around the connection for the points and the condensor), good connections for the feed wires to the coils (one is blue, the other is yellow, if they're wired like my '79 motor), and the fuse for the IGN section.  You can check the point gap and when the points open from the manual.  Just make sure you have the key OFF unless you like getting little jolts of electricity when you put your metal feeler gauge inbetween the points.  It's not fatal, but it IS annoying.

I hope this helps.  Welcome to the wonderful world of manual points.  When it works, it's a beautiful thing.
Luke M