I just bought this bike a month ago and haven't had bikes for ~30 years so...
I was coming home from work and BLAH-BLAH-VROOM-BLAH-VROOM-BLAH-BLAH - very jerky and surgy and no power. Coasted to side. Started - seemed to rev. got going same thing. got it home - cleaned up a few things (under tank ground connections) and took it for a spin. Seemed good!!
Next day - wouldn't start. Would crank and turn over - would never catch. Took out a couple plugs - both seemed the correct colour and dry - had spark. Wouldn't start. LOCKED UP THE STARTER RELAY BECAUSE BATTERY VOLTAGE DROPPED. FUX!
Went to Canadaian Tire (automotive super store in canada), got a battery tender. Had to take off the rear fender to get the battery out. Dropped a screw from the tail piece. Had to call wife to find it. Dismantled the relay and just touched the contacts with the finest emery I had (not very fine) and ordered a new one online (Ebay $40) and put the bike together (with old relay) and put the battery in and cleaned a bunch of stuff.
What is that rusty bolt that goes directly from the battery negative terminal to the engine? Engine ground you say! Oh! So that's where it is/. I cleaned it - used dialectic grease to keep it clean and after final assembly - vroom-VROOM-VROOM-VROOM!!!
The bike runs smoother and idles better. I am going to guess that a weak signal finally prevented the computer from doing it's job properly and the bike wouldn't start. maybe after I cleaned the other grounds, the resistance at the engine ground increased where the computer barfed.
This is my first post of trying to help others. I hope it wasn't too long. I do not mind criticism. I would like to help others in the same way I get so much help from forums. Should I just have said - I cleaned the engine ground and cured my no start?
Cheers from Toronto.