My mower was surging as described by others. I changed the carb diaphragm and used lots of carb cleaner befor reassembling. Now when I start it, it surges for about 2 or 3 minutes and then runs smoothly. Any ideas what is causing this surging?

Johno, November 2013

If you engine is one of the priimer start type there was a batch of engine that had carb faults. Some could be fixed with just new diaphragms but others needed a carb replacment and a few also had to have a modiffied air cleaner. A lot were caught in their warranty period but others have kept going until after it has expired. Take the model type and code number from your engine to your local Briggs agent and they should be able to check if your engine falls in the affected batch. Hope this helps.

Smudge, February 2014