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When the mower starts to die, spray starter fluid in the carb, if the engine starts to run better it’s a fuel issue, if not, I’d go with coil.

Try draining the fuel tank and looking at the connection between tank and fuel line. Your symptoms are very similar to mine and I found a debris (mud) plug in the elbow connection to the tank that was essentially allowing 95% of fuel demand so it took about 20 min to drain the carb bowl of fuel...

I completely replaced the carb. The issue was a clogged fuel line at the tank connection.

Interesting. Well, maybe I should just leave it alone. I have no issue with the engine bogging down - I cut often enough. I was just trying to get a cleaner cut by spinning the blades faster and also increasing suction (both by the blower running faster and lift from the blades.

I already solved the fuel supply issue. Just questioning the rpms

Thanks for the detailed post! I have a brand new carb so everything carb related should be functioning correctly (in theory). I am using an external tachometer which I tested on another mower (Deere x354) which to my knowledge has never been adjusted and it was reading 3350ish rpms -which sounds...

The clog in the fuel line at the fuel tank was the issue! Ran the mower for 2 hours with blades engaged and it didn’t think about dying once! Thanks for all the help! I do have one other question… I’m currently running the engine around 3200 rpms but I’d like to get closer to 3600. The governor...

I’ll file it under “needed to be done anyway” if it doesn’t fix the issue but hopefully it will. Just not sure how it would run for 20 min after cooling down and supposedly running out of fuel the previous time. How did the carb fill up again to allow another 20 min run time? Maybe idling at...

Today I decided to tackle some stray grass and bug remnants I saw in the gas tank. At first I tried to fish them out but when that didn’t work I disconnected the fuel line to the tank to let it drain…. Guess what? It only dropped out… like 1 drop every 2 seconds… slow! So I removed the rubber...

Yes, took flat razor blade and carefully removed the buildup without scratching the surfaces

Thanks. I have made sure the gas cap vents… I can push air through it with my mouth so that part is good. I will try testing the fuel pump as you described. Good idea, though don’t know why that would fail once engine gets hot.

Thanks. Will try that. Also, the spacer I installed already had the gaskets attached to the spacer, I did not use any adhesive or anything, just tightened the carb to the intake - is this correct or does something need to be applied to create a better seal?

Could use some help. I have an old Walker mower with Kohler Magnum 16 hp that runs great for about 10-15 minutes then starts surging like it is running out of fuel and will backfire as well. If I play with the choke I can limp it along but eventually it dies. Things I have already done: 1...