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That tube that runs from the valve cover to the air filter is oil fume/blowby tube - goes to the little side box on air filter box and then drains down into a clear plastic tube, which should be periodically drained. If you are attaching a Uni or simpler air filter and removing the air box, some folks run that valve cover/head breather tube into a can to catch the blowby gunk - there should be room for one with that big ol' airbox outa the way.

Jake - yours sounds normal
Rich, my mechanic (he likes to be referred to as a scooter technician) uses a multi meter, and a wired up contraption using a known good regulator. He checks input and output of regulator - but 90% of the time it is the connections - 1st thing to check, if connections are all good, then he plugs in his regulator - if that works (testing at the battery), then we replace regulator., if not, then he checks stator output...I guess we go in order of price to replace,and typical failure. We have had to replace about 12 stators due to grounded out wiring (out of 550+ bikes), but many more regulators...

Yep - thanks for the pics - that's the spot...we have been replacing the heads w/ new ones from Buggy parts NW - come w/ the valves installed, $49. They seem to be holding up much better than OEM.

I would also check the regulator. Check the voltage at the battery while revving the bike - if the regulator is not regulating properly your voltage will be high - 15 to 18+ volts - first go the lights, then battery and fuses...
blown fuses= short

We strive for customer satisfaction, but our 1st priority is customer safety. We do a thourough PDI, and then I take every bike out for a two mile test ride. I have a route that covers hills, twistys, traffic and Starbucks. I dont let a bike go that is not safe to ride.
I had one SYM RV 250 that checked out fine, but the customer came back 6 months later saying that the front end wobbled on him and he didn't feel safe. We torqued and tightened and test rode - could not find the wobble, so let it go back to him. He came back with the same issue - we could not duplicate the wobble, but put on a new front wheel with new bearings just in case. Turns out he had put on a cruise control/throttle clip and had been riding hands -free...no wonder we couldn't find it - we always hold on...
I am not saying that this is your situation, it is obvious there is a problem that needs addressing, and your dealer is responsible for fixing it. I hope it works out for you - those bikes can be a pleasure to ride!

For our Chinese bike customers (in their scooters), we use 15W 40 Diesel oil (Shell Rotella or Castrol) - we buy it in the gallon container. It seems to hold up well here in sunny southern Cali, and in these hot running scoots.
For our ceramic cylinder lined SYM bikes, we use a Valvoline 10W30 racing oil (high zinc content) for the break in, and then Mobil 1 extended wear synthetic. These are very cool running bikes, so the oil doesn't need to be so thick, and we get better gas mileage with it.
For gear oil we use valvoline syn-blend 85w90 in the handy sqeeze bottle.