Thanks Rusty,
I think it will be better to pull it apart in the short term, it seems to run pretty well so other than dirty probably not much wrong with the carb. It is good to have some reassurance as to where the problem is. I did not want to pull it off and find the problem was with the governor. I will need to get it off any how to get the model number but hard to go past a new one for $15.00.
I had a pretty big win with a Stihl brush cutter and a Chinese carby last year. I took the carby apart and put it back together twice, it was much easier to get too than this one with little success. Put the Chinese warbro in it ran like a dream was able to give it to a mate who insisted on paying for golf next time we played. Pretty much a win broke even dollar wise and got one more piece of equipment out of the shed.