I seem to have a problem with my honda cbf250. When i start the bike from cold i turn the choke on which usually increases the revs to warm up , though recently it doesn't and I have to hold the throttle to keep it running.It doesn't always stay idling when fully warmed up either or restarting when warm it just cuts out.
I've changed the spark plug but funny enough it didn't solve the problem (though did notice a slight performance increase), the colour of the previous plug was a dry biscuity brown (digestive).Also checked the air filter and that was fine (very light colour) ,also checked the battery although it did improve briefly when the battery had just been charged but not for long.There is an throttle cable stop screw on the side of the carb it works to help the idling initially when warming up but i have to adjust it again when its warm as its revving too high(normal revs 1400 rpm). I'm wondering if its an electrical or a choke problem??
anyone have any ideas??