1. If it doesn't start easily it could mean many things. Low compression, worn spark plugs, bad ignition system, timing is out, maybe valve clearances, blocked fuel filter, blocked fuel tap, bad fuel pump, carby problem etc.
2. If the gears don't change smoothly then it could mean that the engine oil is old or of the wrong grade, or at a low level. It could also mean gearbox problems (very expensive to fix). The clutch could also be worn.
3. The throttle should always be very quick to return back to a neutral position, regardless of the throttle position. If it is slow to return or hesitates, then it could mean that it needs a good lube up. It could also mean a problem with the throttle body.
IT IS A STRAIGHT 4 ENGINE!!! Even a very amateur backyard mechanic can change the plugs on these, it's just tricky as there is very little room to put your hands in. Do it yourself, there is very little technical skill involved in it. We're not rebuilding an engine here.
No offence, but the OP seems like a complete noob. We all had to start somewhere, and I too remember the time when I would stall a bike almost every time I would try and take off. A CBR250 is not the bike to buy unless you are reasonably confident on a bike. This bike will pull hard all the way up to 160kmh before it starts to die down a bit, and you will find yourself in serious trouble on one of these. Buy a GN250 and ride that till you get your 6R.
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