Looks similar, but not exact..
Mine are V251 QHL. But different years may vary.
Not sure if right carbs,,, BUT,,,.The fact that it ran well and then went back to what it was doing indicates it isn't the carbs.
May be as simple as it's starving for gas. Check to see the fuel hose isn't kinked..
Or,, spark plug wires and caps.
Remove, clean and tighten the caps..
Ride safe, Ted