anyone had difficulty changing air filter on this model,the acsess is top front of airbox and is impossible to remove from frame unless you drop engine or remove a cylinder.I gave up and cut the top part of airbox in two halves,making removal easy,then fitted new filter and two halves of airbox,zip tied and a bit of bathroom silicon did the job,next time I,ll chuck the complete airbox assembly away and fit two K an N filters :evil: