What did you do to your Yamaha today?

yes, and the fuel is new, it hasn't sat in the motorcycle, it ran perfectly until a fifth something to electric system, as i changed everything i assume, that only the Pickup coil can be still an issue-not changed yet.

The spark is very strong, and the lighting on the motorcycle works as it should, but the spark is very "messy" it doest have stop-go, motion, it sparks almost random, but very fast, almost like it doesn't stop sparking when the piston moves downwards.

 

You could try an auxilliary tank to see if it runs.

 

The crazy spark tells me there's an issue with the little analog "computer" in the TCI module and it might be firing very late in the cycle. It should be one very distinct spark every crank rotation just a few degrees off TDC while cranking. The little analog "computer" as it's known is a ceramic thick film integrated module that sets up the timing curve and each is tailored to the engine displacement meaning a 650 TCI won't have the same curve as a 750. I don't know how well a 550 TCI will work with your 500 but I'd say give it a try. Just make sure the wiring is correct.

 

Spent waaay too long rebuilding the front callipers on my 650 seca. As usual, took ages to bleed all the air out (well, enough so that I have what can be called a brake. It doesn't need much, just enough to ride it down the road for storage. It hasn't run for two years so will need fresh fuel and a battery.