Hi and thanks for the advice, it said in the instructions to tick over for ten minutes, let it cool and repeat, I did that and i have just done ten minutes at half throttle blips, next outing im gonna gun it i think, the place i bought it thinks my issue was caused by a air leak, it hasnt revved up again but was cutting out when warm, seller said this is also a symptom of a air leak so hes sending me a new 'carb isolator' and gaskets ....next run is hopefully gonna be sweet.....after the last run tho i found alot of very small and shiny metal particles sitting in the tray, im hoping this is the burs from the brake disks/rotors, i cant see any damage anywhere, has anyone noticed this before ?