Fuel Starvation, no apparent cause!

If you don't have a gauge, then you can check that the fuel level is 12.5mm below the top edge of the bowl. The bottom edge of the lever arms should be 10.2mm from the gasket flange.

My fuel starvation was intermittent and only at wide open throttle.  I tweaked the float arm position by hand and by eyeball.

Thanks Larry, I shall re check mine and report back.

marc dawson wrote: "it was then noticed that the port carb was flooding and on inspection that the float valve was not seating correctly and shutting off the fuel when it should. This was re seated."

When you say, "this was reseated", what was actually done (and by whom)?

It was done by a professional iRMT person. I don't know exactly what he did other than my previous description which is what he told me and wrote in the log book. But straight after this is when the problem started.