hi people im warren from nireland hav had a 660 for 9years an shes still goin strong one problem lately,shes feckin about starting up.for the first time she spluttered and cut out on a recent spin its def a fuel prob ive good battery power.she has never done this to me before i eventually got going again but if i gave full throttle it would die on me so had to keep half revs in 4th gear. next day shes going like the clappers again.is this common?seen posts with similar problem is this gonna cost loads to sort out