Motorcycle Repair: charging problem?, honda cl350, continuity check

Question
Hi I'm an 18 year old H.S. senior with a 1970 Honda CL350 that I've had since last summer. It runs ok, but recently the motor began running rough at high RPMs and and then the engine began to stop firing in time with the turn signals when they're on. I charged the battery and it ran ok when I drove it for a short distance, but this morning (5 days later) the motor began running rough at high RPMs again. it runs fine at an idle but if the ground is taken off the battery it dies. Can you help me on this?

Answer
Sounds like the charging system isn't keeping up.  After you charge the battery, start the engine and rev it up to 3-4000 rpm and check the battery voltage with a volt ohm meter.  It should read 13.5-14.5 volts.  If it's less than that, the charging system needs some attention.  It can be the stator, rectifier, regulator or the flywheel magnets.

You can check the stator with a resistance check between the 3 yellow wires coming out of the alternator. They should have equal resistance between them and no continuity to ground.  The rectifier can be checked with a continuity check.  You will have continuity one way between the input wires and ground but no continuity the other direction.  

There's no good check for the regulator or flywheel magnetism. If you put a screwdriver on the magnets on the flywheel and it's not hard to pull off you might have a magnet problem other wise those are just replace as needed.  

Regards
Rich