On a dutch side I found the folowing,

If you drive with 3500rpm in second gear, the engine acts sometimes asif it
stalls for a moment. This stays this way until you increase the trottle. It
seems that YAMAHA has a new EPROM (software in an IC) wicht has to be
replaced in the blackbox for the ignition/injection. The problem was solved
with the new EPROM.

Maybe this can help you.

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