Hi,

I have an oldrunner Yamaha XJ600 (build year 1989) 51J. I wonder if there is anyone who can pinpoint my problem. While riding all the lights (including the dash) become bright for a few seconds and then return to normal and sometimes they dim below normal level too. It fluctuates all the time but especially when at higher rmp. Could it be the voltage regulator? Just don't want to go the saga of buying expensive parts for nothing.

Thanks,

First check your earth attachments, usually something simple like that, make sure they are tight and have a good contact. Don't get tunnel vision with things like this try the simple things first then work your way up to something expensive rather than start there.