so i bought my first bike, a CBR 250RR about 3 days ago and today as i was riding it, the throttle responce started to decrease, it wouldnt reach higer than about 5K revs on any gear and was showing signs of stalling any second so i rode it back home and just as i got to my driveway it turned off completely. i checked the petrol there was close to 1 litre so i filled it up and it still wouldnt turn on, it cranks over but not turning on. tried clutch starting it down my street still didnt work. what could be the problem? cheers in advance