Hi guys, I have bought a uk Starket as a daily and I have a problem, the engine revs fine from cold but as it warms up it stutters upon acceleration and more times than none, stalls. It then struggles to start, I have taken plugs out and it looks as if it running lean, I took the air filter off and covered up the intake 80% with my hand and it revved freely and fine but when airbox is back on it stutters, could this possibly be air fuel ratio incorrect? any help much appreciated as I am now had to take my glanza out of the garage and use in this crap weather !!!