My problem is that I bought repair kit for carb and replaced gaskets and set the float by the book also I set the mixture. Now, the problem is when I put the petal down just tu start moving I have flat spot in rising the revs. It is like it will shut down then the revs climb up and goes up normaly. But only from 900 to 1200 revs it has that problem and after that reaction to the throttle is normal. The problem persist when the engine is even hot or cold. I checked pump jet and it is ok, it works properly. If someone had similar problem pleas note me.