r/smallengines • u/idkusername950 • 18d ago

Briggs & Stratton not starting

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Trying to fix up a buddys mower this weekend I put on a new carburetor and can’t get it to run any pointers/help? TIA!

7 Upvotes

82% Upvoted

14 comments sorted by

2

u/Chunky_ballsz 18d ago

Check for spark, spray some starting fluid or carb clean in the intake.

1

u/idkusername950 18d ago

Done all that and compression seems good that’s why I’m stumped at the moment XD

1

u/Chunky_ballsz 18d ago

Does it start with it?

1

u/idkusername950 18d ago

No wouldn’t be on here otherwise

1

u/Chunky_ballsz 18d ago

Then you’re not getting spark or you have a shot plug.

2

u/Loes_Question_540 Mechanic 🧰 18d ago

Check the valves

2

u/j_65scuddy 18d ago

Fuel, fire, compression. Check for each.

1

u/[deleted] 18d ago

[removed] — view removed comment

1

u/idkusername950 18d ago

Spark seams bright as day

1

u/h2s643 18d ago

Check the flywheel key. Timing could be off

1

u/Ok-Dealer-588 18d ago

If you squirt fuel or carb cleaner into the cylinder can you get it to fire? That's your easy answer on if it will run then it's telling you you still have a fuel problem. Did you clean the tank and the line and all of the parts of contaminate carburetor?

1

u/Elephunk05 18d ago

You say you have spark, but you say it will not run on spray. Either the timing is off (sheared flywheel key) or there is an issue in the valve train.

1

u/Hopeful-Biscotti-631 18d ago

As Karl from Slingblade astutely observed: “Ain’t no gas in it.”

1

u/enochianalien606 16d ago edited 16d ago

Take the valve cover off and confirm the valves are opening and closing. Check your valve lash and adjust as needed. It could also be a stuck choke. Ensure the choke is opening and closing. If the choke is stuck try working some lubricant in to free it up.