I bought the boat and motor in march and have used it roughly twice a months since. Started and ran fine for the first few months, but now it is doing the following. It will start right up at the lake, but will not do WOT until it is warmed up quite a bit. Then, if I let it sit for a while it is hard to start. Once started it runs fine again, but if I let it sit for a few hours it is hard to start again. Think a decarb will help?