Hey there guys just joined the forum! Glad to be here! I have a few questions on my 1979 Honda cb750k.... so at idle the bike will lose battery voltage but very slowly yet when I hit the throttle I see a spike in voltage. Problem is it doesn't go anywhere near the spec 14v. It will rise to about 12.3 and this is with a freshly charged new batterty. My thoughts are rotor? I've checked the stator and brushes but not my r/r. Could r/r cause this problem or more rotor related? Any help appreciated! Thanks!
Sounds like the reg/rec since it is charging some. When the rotor goes bad, they usually do not charge at all.
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1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)