Honda carbs in general seem to hate having fuel left in them - their gennies are the same.

Usually draining the old off and running fresh through has solved my woes, but a strip and clean will be the best bet.
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball