Seems narrow. The recommended gap for the ZDZ50 is 0.035. It was at 0.025 from the distributer and it ran like crap till we opened it up. The pin hole in my setup was in the filter it self. Easy to see when choking the engine. You can see the air in the lines. It however takes a large amount of air to bother a Walbro carb.
Have you checked for a good spark? Timing?
Good luck! Hope you figure it out.
Originally posted by tailheavy
As for the spark plug my gap is set at 0.022 - 0.023 inches. It was at 0.025 and I reduced it slightly to see if that would help but it didn't. [/B]