Motorcycle Questions? Ask a Mechanic.
Hi Howard, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.Initially and if the sparks are present and consistent, then it would appear to be a fuel delivery/starvation issue. Proposed preliminary checks (if have not been done) on suspects:
The video tutorial HERE on injector cleaning may shed insight.
Good luck and thank you too for the opportunity to be able to exchange information.