||I have a 2010 gas that runs fine when cold but when gets warm starts to surge. Have done complete tune up and carb rebuild. Have even bypasses the govoner to no resolve. I remmoved the muffler and seams to run a litle longer. when suring starts you can choke it and it will stay running but still surges under load. any help would be appreciated. It has a loader and great tires could be for sale 417-581-1122
||Jon, just went through this on one of my 420's. My problem was that I was short the gasket that goes under the main nozzle. If yours is in place then you probably have one of the small passages leading to the venturi still restricted. I had to soak mine twice to get it clean.
||Did you ever figure out what your problem was, I have a 2010 doing the same thing and I have replaced everything including the carb with a new zenith. I just can not figure it out. If anyone can help me with this problem call me at 636-566-8785 or email me at firstname.lastname@example.org. Any help would be appreciated. Thanks