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Hi all
I’m new to the forum and I’m looking for advice concerning my second hand petrol lawn mower with a Briggs and Stratton engine.
The mower as run poorly since owned and I have serviced it and changed the oil, tightened all bolts and checked the distributor. After inspecting the choke I’m unsure if this is correct.

For us to help you we will need the model number of the engine so we can see what style of engine you are having issues with. To many variables in play to give much direction.

I think it’s a 550 series

The governor spring is in the wrong place for a start,
It goes into the long slot hole , not the round hole.
THe round hole is for the control wire
And there is no choke the only thing that moves on that carb is the THROTTLE butterfly
There should be numbers stamped into the blower housing above the spark plug.

Thanks for the reply’s, I’ve never had a petrol mower before and think I picked up a dud but I’m mechanically minded so I’m going to try and get it running right.
Any advice going forward would be greatly appreciated
Numbers are i think
i0T802 0140 B1 08090454
Cheers Craig

An air filter would be a good addition. Love those old foam jobs you pour some 30w oil on.

slomo

Hi it does have an air filter??
It was removed so I could take the photo of it a bit better
Cheers?

Ceasom said:

Thanks for the reply’s, I’ve never had a petrol mower before and think I picked up a dud but I’m mechanically minded so I’m going to try and get it running right.
Any advice going forward would be greatly appreciated
Numbers are i think
i0T802 0140 B1 08090454
Cheers Craig

Click to expand...

10T802-0140-B1 2008 model

Find the breather assembly behind the carburetor/fuel tank assembly. The Carb/tank needs removing so you can remove the breather assembly. This is so the valve clearances can be checked. They are probably near zero clearance being a 2008 engine. When this happens the engine will run poorly.

In order to adjust the valves, they will need to be removed. Get a copy the Briggs single L-head service manual as it help you through the repairs.

Also since it will not start when hot I would check for spark during the time it will not start as you could have ignition coil failure.

Thanks Star Tech very appreciated.
cheers for the reply
Craig

Failure to restart when hot is the main symptom of vapor lock. The hot engine and lack of flowing fuel vaporizes what should have remained as a liquid. It' happens more redily if you are still using a winter fuel blend. Restarting will be difficult.

On those engines the breather is on the other side of the engine, no need to remove the carb/tank to get to it. As Star said, the next time it won’t restart, check for spark. Common problem on those older engines is a coil that develops a hot short or hot open, which would mean replacing the coil if you find no spark.

Ceasom said:

Hi it does have an air filter??
It was removed so I could take the photo of it a bit better
Cheers?

Click to expand...

Re-gap the spark plug. Had a push trimmer that wouldn't start hot and when I re-gapped it starts everytime now.