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I have never adjusted the valves before and don't think I could. You mentioned the ignition coil and I've thought as well. Although it starts ok, could a faulty coil cause the engine to sputter after warming up and running for 20 minutes or so? I've put Seafoam in the tank a couple of times now...

What complaint??

I tried the suggestions regarding vent line and removing the gas cap, unfortunately it didn't make any difference. There must be an answer to this. This is my third season with this tractor and it runs great until maybe 20 minutes or so and it will sputter and eventually shut down. I can wait...

Thank you, I'll try that.

Thank you Rivets and Liengine for your reply. Should the cap be vented? If it uses a vapor recovery system, is there something I could do to remedy this? Thanks guys!

This is the 3rd summer using the Troy Built TB 30r rider. This season it starts fine and runs well until it chugs like I'm running out of fuel and then chugs until it stops. I can wait for ten minutes or so and it starts fine and runs well until it starts to chug and stop again. I've changed gas...