OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Engines Questions On Briggs & Stratton Engines B&S 450 no start, no prime

Hey guys, new here.

Just trying to fix our VICTA Vantage mower with a B&S 450 engine.

It started a little while ago, it was running poorly. I removed the carb and cleaned, unfortunately looked like the diaphragm/gasket were a little old, so I bought a new one, installed, and mower ran (not that great, but ran). I also changed the oil (which I don't think has ever been changed) with some 15w40 I had left over (Mobil Delvac).

Now, after trying to mow the lawn, it would often cut out if too much grass, I think that's normal, but each time became harder to start, until now, it won't start.

Trying to prime, nothing would happen. I can hear the sucking sound of air, but no fuel will squirt. I've cleaned the carb & replaced the primer bulb just incase, but no luck.

Wondering if anyone had any suggestions?








Summary:

- Changed Diaphragm + gasket on carburetor
- Changed primer bulb
- changed engine oil
- cleaned carburetor