I have a Rotax senior max 125 cc Kart - which was working beautifully. It would start first time.

On the last use, we drained the carb, cleaned the air filter as usual and left it for about 5 weeks on the flat before trying to start it again today.

On trying to start today - the starter motor turns, the small 'gear wheel' spins - but nothing else happens!

I am at a loss to know what could be wrong - nothing else has changed on the engine since last use.

Any ideas?
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