Idle is usually carb and or adjustment. That little critter isn't an easy to learn on rig. He is big enough to handle it though. Soften it at first so he can touch and feel confident. Five rides or less if you do some training drills and he should be ready to set it up for more serious riding. Lots of stop and start practices on good ground. Pavement if you can. If you have some sprockets that will lower the gearing it helps too.
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