Vfr400r nc24 1988 cuts out at high revs when riding

[Snowyjr69nc24]

Hi guys been riding my vfr the past couple of days it's been fine all day in the sun but comes to night time and I have the lights on as I'm throttling it on a straight or round a bend it just completely dies ramdomly, won't bump start if u use the clutch n drop it though the gears as still rolling, but the ignition is still on and the lights u have to turn it of wait few seconds and it fires up and rides fine again, any ideas what it could be ???I was thinking reg, rec.need it sorted it dodgy when I'm giving it some and the bike completely dies haha

[magg]

Measure the battery voltage with engine at 3000rpm with headlight high beam on, should measure more than 13.5 volts.

[magg]

Measure the battery voltage with engine at 3000rpm with headlight high beam on, should measure more than 13.5 volts.