hi i have a 2litre redtop loom running a 1.2 but i got it working and it wouldnt stop and so i put a cut off switch on it i gave it a run about a feild today and it boiled over i sorted that out and stared it again and it run fine so i switched it off and about 45mins later i went back to it to move it and it wouldnt start?? dose anyone no what could be wrong