Perfectly normal. The idle must be a little high, or you've only noticed it while the choke is on.

Once the RPM goes over about 3000rpm, it will cycle back to "Lo" until around 7000rpm, when it will start to open again.

It opens between 2000rpm and 3000rpm to aid setting the RC Valves, and check their operation.

The idle should be set about 1200rpm. Once warmed up, if you blip the throttle a little, you will see the RC servo cycling if the system is working properly.
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Andy.
NSR-WORLD.COM

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