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Good reminder. I checked that and it made no difference. I got my small drill bits yesterday as well as a new carb. Will try drilling out the old main jet first after checking old diameter versus new and go from there. Owner loves his mower because the walking pace is FAST. And I mean fast.

Just had the same problem on my own mower and found the part separately for less that $20. Hardest step was finding the part number on the Briggs site. With a model number shown like this: I discovered typing in the first part before the first dash brings something up on the Briggs site so...

How were the surging issues fixed? I have a friend with one that surges after a few minutes of running and will die if you don't choke it hard or keep priming. Saw another thread about drilling out the main jet.

Sounds like it's time to take it apart. What will you find? I like this part of the process. Post pics.

After a spark check, I'll pull the carb bowl and clean the spots with red arrows leaving the carb still on the machine. The spun wire files shown above work good, or torch tip cleaners shown below with the ends cut off to get at that top hole in the nut. Bad spark plugs are rare. Dirty...

Had a dead Craftsman rider that behaved like yours. Would not start at all, even with starter fluid. Hand over air intake showed no suction at all. What what you get on yours. It was a bent valve lifter rod. Took the head off it and replaced that rod and was good to go once again. Didn't...

Does it still happen if you loosen the gas cap?

Had that with a push mower, but it was in 5-10 minutes. Gas cap needed a small hole drilled in it. Metal piece on the other side was missing. Super easy test: open the gas cap when it starts doing it next time. If it clears, you've got a vacuum in the tank.

Here's another similar fix. Mower was surging and leaking gas on top of tank. I put a hose clamp on the intake pipe to hold the white retaining ring in place along with the rubber o-ring behind the retaining ring. This stopped the gas leak and the surging.

I enjoy helping people with broken mowers and have had plenty of 'business' over the last couple of years. Thought I'd check out your forum. Here's a fix I did recently on a mower that would not start unless I covered the intake to the carb with tape. And then it would surge as I covered and...