OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Engines Questions On Briggs & Stratton Engines Briggs & stratton issue

I've got an older Masport mower with a B&S motor, serial number
92908 220801 82072108. I previously have replaced the carby with a late model one which has no carby adjustment screw.
The mower starts first pull 90% of the time, if not then the second pull. Runs perfectly but then after about 20min stops. Then doesn't like to start. It started today after I changed the spark plug but was spluttering the rest of the time. Last time it happened it didn't want to start. When I used it 2 weeks later stated first go.
I also noticed today when I started it it spluttered slightly for about 30 secs.

Does anyone have an idea on what it could be?
It's a good older mover and I don't want to retire it yet.

Your engine was made in 1982, which means it has an early example of the breakerless ignition. The first thing I'd suggest you do is check the spark intensity: see whether you have a blue spark when you pull it over with the vertical pull starter, or an orange spark. If the spark is OK (blue) it could still be ignition, but the module only breaks down after it warms up.

It could also be carburetor-related, or more likely, a sticking or leaking valve which gives trouble after warm-up. I suggest you start off with the ignition. You might consider getting a second-hand module and switching them, if you get uncertain results from the spark test. Also, you could check the compression: disconnect the spark plug lead - and make sure it can't fall back into place on the plug. Turn the blade plate backwards (opposite to the normal rotation) until you feel compression, then flip it backwards a few times to see if it bounces off the compression as it should. This test only works with a Briggs if you rotate it backwards.