Blaster reving when just tapping the throttle

Jul 5, 2007
533
11
54
england
well my blaster will just rev up when i just tap the throttle like only just moving it. it really only seems to happen when its not quite warmed up fully, i had a look at the throttle thingy (on top of the handle bars) and sometimes the throttle will get stuck so when i tap it it just gets off the tors and will rev up as the throttle is tuck open.


so can anyone help any advice will be very welcome cheers :)