Guys, having an issue with a MC16.

Bike starts fine and idles great. Once warm I took it for a spin but under load the tacho drops back to zero and then comes back again.

I parked it and it went back to idling fine, but then it seems like one cylinder kept dropping out and coming back, and everytime the cylinder would drop out the tacho would drop back to zero. Is the tacho dropping to zero a diagnostic?

Thanks in advance.