It's been several years ago but I had issues with my stock RR on my 97' VFR. At the time did some research and found these resources (I am sure others can be found on this site but I had this on my computer). In short I ended up going with an aftermarket R/R and rewired a new harnes with higher gauge cable to handle amps necessary. and have never had a problem since.
Hope this helps and you find your solution!
👊😉
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voltage regulator check list.txtThe Junkyard Dog Regulator-Rectifier.htmSources of R-R Problems with Recommended Solutions.htm