you could check the spark with a timing light. put the inductive pick up around the plug wire and aim the light at something you can see clearly (sheet of paper, the floor, etc.) start the bike and rev the engine. if it is a spark problem the light will flash erratically. if it is fuel, then the spark should be uniform and consistent with rpm.
even if it is fuel, if the engine cuts out, the spark will fluctuate with engine speed. whereas if spark is the problem, you should see the diference in the light before you see or hear it in the bike, if that makes sense.
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