Morning boyz, I've got a problem with a gas mower and for the life of me I can't get it working properly.
It's a 2 year old push mower with a 148 cc 4 stroke Briggs & Stratton motor.
When it was stored away last fall I stabilized the gas, then ran the engine dry and changed the oil. I fired it up yesterday for the 1st time this season and it started on the 1st pull like it always does and ran perfectly for 10 seconds then the problem started.
It runs at full speed for 1 second then the revs drop right down for a second then back up to full speed again, then just keeps repeating this over and over...up then down, then up and then down again. Every time the revs increase a puff of blue smoke comes out the exhaust too.
The air filter is clean, the spark plug is clean and I ran SeaFoam thru through the motor but it still didn't make a difference. I looked for a gas filter but there doesn't appear to be one.
I've been scouring the internet and the Briggs & Stratton websight and everything tells me to adjust the carburator settings, but this doesn't even look like a normal carb and there are NO adjustment screws that I can find.
It's only a cheap mower that I use for spots I can't get the riding mower into and can replace it brand new for $160 so there's not much sense in taking it to the repair shop but thought someone here may have an idea.
Anybody have any thoughts ??
This is the air box with foam filter...clean
Air box removed looking down into carburator
No adjustments anywhere....that I can find