To answer your question : your symptoms are unusual for this scooter.
You purchased on a day in April 2015,,,this is April 2017 - are you still under the two year warranty?
If so, make calls, use your warranty.
If this is not possible for some reason - you describe a difficult situation of having no place to work on the scooter.
My First Thought is that the valves are poorly adjusted - causes noise, hard starting, misfiring, etc.
So, other ideas;
when you turn on the key, without starting the scooter, a light will blink for a moment under the fuel gauge. After that, this light will blink to indicate a code of flashes for faults in the fuel injection system. Problems in F.I. system can cause poor running, poor starting, poor idling, loss of power etc.
(frankly, if everything is plugged in, and no fuel junk carried into the injector - the LIKE's F.I. system is very reliable)
Is this light blinking ? which indicates FI fault codes.
Did they adjust they valves ?
spark plug cap-wire on securely?
spark plug screwed in snugly?
battery connections tight?
grounding wires tight?
Any of the above are loose or out of specs you will have ongoing issues.
Correct spark plug? correctly gapped? Old or new spark plug?
You say if ran poorly after a serving - what did the service entail?
Were they under the seat touching the engine, or just changing oils & working on the belt & rollers etc.?
Give us more info and we'll help you sort this out - assuming you are now out of warranty period.
Stig
