Have a 2009 Yamaha TMAX with 10,000 miles. Always synthetic oil. Last 10 days with 105+ heat days, has not been starting AFTER the first ride of the day. In the am it's fine, but after lunch, won't start (engine cranks, but won't fire). After a few hours, it starts, but after another ride. Won't fire up again.
Installed new NGK Iridium plugs, gapped at .7mm. New K&N air filter. Switched to REAL gasoline from 10% ethanol. Battery tested at 13.8 volts. I'm stumped. Help, this is my primary transportation, and my good Yamaha dealer is back-logged 2 to 3 weeks.