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just started working on an 82 cb900 custom I got last fall. turns over fine but would not start. tried starting fluid. stumbled a few times. noticed only cylinders 2 and 3 got warm. also noticed that one of the set of two plug wires going to the regulator/rectifier looks like they have been exposed for awhile. core of wires exposed and looking as if they have been exposed for quite awhile. and the covering is crusty and degraded. know the bike hasn't been on the street since 2006 but do not know the story of why it was parked so long ago. would a failed regulator/rectifier supply spark to just two of the cylinders or when it fails does the spark fail to all of cylinders? I see also the two sparks units mounted just above the reg/rec and assume that each of those controls two cylinders. not an expensive part but want to replace the correct part. any advice is appreciated.. little guy david
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David if you google CB750-900-1100 forums you will get the sites with owners that are familiar with the nuances of that machine. There are several different forums for that model. like the one I just linked to.
http://www.cb750c.com
This site deals mainly with the NEW 2010-2014 Honda CB1100 which although similar are completely different animals.
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A relative from MI had an early 80's CB900. I considered one myself before going with the newer CB's(1100).
I also got my CB start with a 71 CB-750. My 1971 750 always ran fine when I owned it in the 80-81+ year timeframe.
That CB900 the relative had got me thinking about another CB. He has since traded it towards a used Harley. Good luck with the 900.
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I really wish I was good with the intricacies of internal combustion engines. Sadly, I'm quite inept. But I enjoy learning about them and I'm not afraid to crack open the service manual and tackle most repairs when needed. I'm hoping that will be few and far between with the CB11. Good luck on your project!
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It sounds like a bad coil, or current is not getting to one of the coils. Can you confirm that the cold cylinders are getting spark.
