Few years back I had a similar problem a day after riding through a rough storm - lost rpm and engine would die and retart/run and repeat. I did not think it was fuel related because of recent fill up. I drained the tank and shined an inspection light into it and was amazed at the crud/gunk on the bottom. I started there- cleaned the tank repeatedly, updated the fuel lines to A1 low permutation [needed for ethanol], new fuel filter, changed the electric fuel pump [there is built in a filter inside], cleaned the carb AND most importantly added a 0-15psi fuel pressure gauge. This will help with any diagnostics regarding fuel vs spark.
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