If the engine is new reeds are highly unlikely. If the engine is less than a couple years old with occasional weekend use the reeds are not likely. If the engine is older than about 5 years, made before some reed changes occurred, there is a possibility of reeds being the problem. It won't hurt to check but I think it's elsewhere.

I'm going with percentages. Carbs are assembled by worker bees in China, Mexico, Taiwan, and Japan. The Mexico Walbros have been a problem since the first day there were assembled there. The China Walbros are assembled by what are likely some of the least experienced assembly teams on the planet. Taiwan a little better, with Japan at the top of the quality food chain. The room for carb assembly error is high, especially in two areas. One is correctly fitting the needle top to the diaphragm slot. The second is in bending the needle lift forks during fitting to the diaphragm cover, forcing the needle higher than it should be, creating a leaking needle seat.