Thanks again Russ,I will check these things you've mentioned, starting with the spark plug etc, I don't use premium gas, I usually just run E10 as its the cheapest, but I might try 91 and see if there's any difference, we also have 95 and then Premium which I think is 98, but it's 20cents a litre dearer than E10,not all things like E10 so it could be the fuel.