Join Date: Mar 2008
Location: Kapuskasing Ontario Canada
The regulator/rectifier part # change to 21066-0705 (replaces 21066-1127) is listed for all model years. No idea if and how it's any different.
The regulator/rectifier firstly rectifies the AC coming from the stator back to pulsating DC using a set of Diodes (allows current to flow in one direction). The rectifier then limits this voltage from the 50-60V pulsating DC by "wasting" power using zener diodes. More current draw after the reg/rec increases current flowing in the windings of the stator, which will increase the temperature of the stator and the reg/rec as well.
Stator failing from burnt shorted winding wires is primarily caused by heat, mostly with stock shunt type R/R in favor of a more expensive series type R/R, and vibration damage to the winding wires' thin varnish insulation... Engine oil does provide some cooling to the stator. Oil temperature is a bit lower with synthetic oil, and also provides more cooling to the stator when kept at the full mark.
Last edited by invader; 03-02-2012 at 12:31 AM.