For trouble-shooting the regulator, the Electrex guide is very helpful (http://www.electrexusa.com/electrex_fault_finding.html) - tells what the voltages should be at idle and at various RPMs.

Re heat probelm, start simplest and work up - check coolant level is okay, then check thermostat, etc. - I had the impeller (sp?) shatter once - bike would overheat real fast!

Good luck.
-Jim
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-Jim
'93 MC21