Starting & Cutting Out Issues.

[Camms61]

Hi,
I have a 4 years old Toro 21766 recycler mower (photo attached) which has develop erratic starting & cutting out issues.
I have flushed out the carburettor & the petrol tank, replaced the spark plug & the lead but these problems still exist.
Please can anyone suggest any reasons why I’m experiencing these problems.
Regards.

 

[Bertrrr]

I guess a better description of what exactly it's doing would be in order,
Does it start up fine then run a while , start to miss then die out ?
How long does it run before problems arise ?
Is the new plug make it any better or does it stay the same ?
Did you notice anything in the tank when cleaned like rust etc. ?

 

[Camms61]

I could be mowing the lawn for varying short lengths of time and then the engine just starts to miss fire and cut out, when I try to start it again it won’t start, I can leave it for a while, go back to it & it could start again straight away.
There was a little debris on top of the outlet filter in the plastic fuel tank which I syphoned out & there wasn’t any debris in the carb float bowl.
The change of plugs didn’t make any difference, also the plug wasn’t soaked with petrol either but it was sparking.
Regards.

 

[mechanic mark]

Parts – 55cm Recycler Lawn Mower | Toro

www.toro.com

parts & manuals for your mower above, familiarize yourself with information.

how to test engine coil on lawnmower - Google Search

 

[Camms61]

I have the Toro manuals but unfortunately they don’t appear to describe anything relating to an engine that keeps cutting out.
Regards.

 

[Bertrrr]

Sometimes a faulty ignition coil will cut out after getting hot and cause it to die, after cooling off it will fire again
Next time it dies after mowing and will not start , check to see if it's still firing, this should give you an idea if it's ignition or fuel

 

[RYANS']

My friend, problems are do to fuel, air and spark. I would listen to the man's advice about a faulty coil. The heat from the engine is causing the mower to stop running. My mower ran a lot smoother with a new spark plug. I wonder if there is an air leak some where. The mower in the photo looks to be worth repairing, if not, take it to someone who can help.

 

[Camms61]

Hi,
I managed to start my mower today and it kept going for 45mins or so & but engine cut out again & wouldn’t start again.
I removed the spark plug which was a nice brown colour and very dry, I then pulled the starter cord with the plug out of the engine to see if there was a spark and there was.
My problems now probably point to a lack of fuel getting through to the cylinder to ignite.
Any help on how to proceed from this position to get my mower going again would be much appreciated.
Regards.

 

[Bertrrr]

Well now you know it's a fuel delivery problem , I'd start at the tank and work down from there , fuel lines , filter ,then carb. some fuel lines can collapse internally and cause problems,

 

[RYANS']

Hi,
I managed to start my mower today and it kept going for 45mins or so & but engine cut out again & wouldn’t start again.
I removed the spark plug which was a nice brown colour and very dry, I then pulled the starter cord with the plug out of the engine to see if there was a spark and there was.
My problems now probably point to a lack of fuel getting through to the cylinder to ignite.
Any help on how to proceed from this position to get my mower going again would be much appreciated.
Regards.

I believe the heat from the engine is what is causing the mower to stop. As the metal expands maybe a gap opens and causes the fuel to stop being delivered. You need expert help to solve it.