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It looks like the old fuel gummed up the carb. I got some stabilizer from the mechanic when I picked up the mower. Hopefully that will prevent this from happening all the time.

I took it back to the mechanic today. He thinks the problem is due to the partially old fuel I used—gummed up something in the carb. Guess I should have just dumped the .5L leftover and saved myself some trouble!

It started surging while cutting tall grass but still surges at idle. (The video was taken at idle)

the saga continues. I pulled out mower for the first time this season, and it started right up. cut well, ran smooth for about an hour and then started surging again. Fuel bowl is clean, the float moves freely, and i tried cleaning idle jet with canned air (i don't have anything small enough to...

I followed this video. It wasn’t easy (i.e. hard but not complicated) but I got the shaft from being over 1cm off down to about 1-2mm. Not perfect but much improved. After my latest incident I still need to check if the shaft is bent again or not.

And the saga goes on… One repair I didn’t mention was fixing the height adjustment. The arm connecting the front wheels to the back was missing a bolt. I didn’t have the right one on hand, so i improvised by putting two nuts on a tiny piece of threaded rod. Well the nuts worked their way off...

The end…for now. I replaced the flywheel key, tightened it appropriately and the engine started right up. I now realize I sheared the last key off from the first pull of the starter. It tried to start just that one time and never would again. Thanks for all the help! Fixing the self propelled...

Yep. Key sheared completely in two. Guess I’m going to get a torque wrench. I’m going to replace that key and then look at the valves if it still won’t start.

I was afraid of that but I didn’t check the key again yet. Sometimes it jerks when pulling, but not nearly as bad as before. When you say “not properly torqued” do you mean not tight enough or that I need a torque wrench? I’ll look at valves too.

It’s an 11P902-0809 - B1. I’m going to pick up some carb cleaner tonight and give everything a good spray. i need to find a good fine wire—Bristle from a metal brush?

I was given a mower after it hit a large root and wouldn’t start any more. I have already: -replaced the flywheel key -Straightened the driveshaft (following Steve’s small engine saloon) -emptied/cleaned gas tank and fuel line -added fuel -checked oil -Disassembled carb and cleaned with...

Well I got it back from service. Mechanic told me it was the carb, generically. Mowed the lawn one time, and it ran better but not great. Then I changed the oil after the first 5 hrs usage. And then it wouldn't start at all. It's back at service again. :(

if the needle were stuck open does that cause fuel to run out faster? The second tank seemed to go pretty quickly.

I took it to service today. It took several pulls before the mechanic could start it, and it put out copious amounts of dark smoke when it ran. He shut it off and didn’t ask any questions. I’ll let you know what he says when I get it back.

well I ran a full tank of gas at full throttle and the surging didn’t stop. I’ll have to bite the bullet and take it to the shop or try my hand at cleaning the carburetor. I’m guessing I won’t be able to get warranty service due to “misuse” since I ran it on low throttle.

I bought a new mower with a B&S 750EX engine. Used it about 1.5 hrs on low throttle (thought I would save gas). Then the engine started surging. I looked at the spark plug and it was covered in soot. I changed the spark plug and it is still surging. Does this sound like a mechanical issue...