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Starting & Cutting Out Issues.

#1

C

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.
File_000.jpeg


#2

B

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. ?


#3

C

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.


#4

M

mechanic mark

Parts – 55cm Recycler Lawn Mower | Toro

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


#5

C

Camms61

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


#6

B

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


#7

RYANS'

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.


#8

C

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.


#9

B

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,


#10

RYANS'

RYANS'

Camms61 said:
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.
Click to expand...
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.


#11

StarTech

StarTech

Just because a spark plug fires outside the compression zone does not always mean the spark plug is good. You to try a known good spark plug. And yes I have seen plugs to fail after heating up too.


#12

R

ran440

To confirm a fuel problem next time it quits, remove the air filter and shoot some starting fluid down the carb. If it starts right up, it's a fuel problem. Next loosen the fuel cap and try to start again after a few minutes. Sometimes the vent in the fuel cap becomes restricted and won't let air in. No air in, no fuel out.


#13

K

kjonxx

Camms61 said:
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.
Click to expand...
Coil


#14

W

Wheels

Simply test for you. I have seen this a lot and would try the gas cap test. The fuller the gas tank the quicker the engine could die out. Emptier gas tanks could run a long time before it fails. So with that fill the tank at least 3/4 full. Run it and see when it dies. Then loosen but not remove the gas cap and see what happens. Simple test, if nothing changes then I agree with coil problem.


#15

Alan46

Alan46

I would go with the gas cap not venting properly, I’ve had that happen on to different machines!


#16

R

RevB

Camms61 said:
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.
View attachment 68293
Click to expand...
"Featuring the lightweight 7.25 lbs gross torque, 163cc overhead valve engine featuring No Oil Changes ever." Cut and paste from advertising.

Please tell us if you followed this last shit piece of advice.


#17

S

scoyote

The underjetted cartridges in these ohv Briggs engines are usually the culprits --but if you can run that long and rule out a coil failing ---i would look at fuel delivery. I'd lean more towards a venting issue. These mowers are not cap vented ----they are tank vented into the filter backing plate. I've seen the odd case where the fuel seems to siphon out the vent and leak behind the filter--very rare--but i might want to try plugging that vent and drilling a hole in the cap from the inside


#18

C

Camms61

RevB said:
"Featuring the lightweight 7.25 lbs gross torque, 163cc overhead valve engine featuring No Oil Changes ever." Cut and paste from advertising.

Please tell us if you followed this last shit piece of advice.
Click to expand...
Definitely not, I change the oil at the start of the mowing season.
Regards.


#19

kbowley

kbowley

Fuel cap vent. Soak the fuel cap in some dish water and rinse well. next time it happens try loosening the cap and see if it fires up. alternately simply purchase the correct fuel cap from Toro dealer and be done with it. But first check to see if it fires up when you loosen the cap.


#20

O

Oddjob

Here’s an easy issue to rule out or in: do you have an autochoke on this machine? If so, next time the engine dies on you take off the air filter and visually confirm if the choke is open or closed. If it is stuck closed then you have your answer. Taryl Fixes All has a good video on fixing or replacing autochokes. Personally, I just gently manually move the lever back and forth until the autochoke mechanism freely moves.


#21

1

1BUCKEYE

LONNNNNNNGGGGG & EXPENSIVE STORY MADE SHORT... I'D CHANGE THE GAS LINE.


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