I can't tell how much work it has done, Sam, or how heavy-handed the previous owner was, so I can't say whether the basic kit will be sufficient. From my limited experience with whipper snippers I'd guess that it won't need more than diaphragms and gaskets unless it has been used by a farmer or contractor. You will have to adjust the needle valves of course - the manual tells you how. They would only need replacement if someone has messed them up by ham-handed adjustment (screwing them all the way in, hard, or bending them). Your problem is most likely diaphagms, gaskets, maladjustment, or dirt.
I think the right kit will be available in the on-line store here.
