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Lawn Mower Problem

 
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Marionb



Joined: 27 Aug 2006
Posts: 5086
Location: Mid-Wales
PostPosted: Wed Aug 03, 11 6:12 pm    Post subject: Lawn Mower Problem Reply with quote    

Are there any lawn mower experts around?

My mower's developed a problem

It was backfiring and then dying out, but would start again after a few minutes, only for the same problem to happen again after another few minutes.

Now its just dying out without the backfiring. I took the air filter out, cleaned it and put it back in, still the same. Took the air filter out altogether... still the same.

I think its a fuel problem but wouldnt know where to start.

Can anyone help? Its a Honda Izy.

Thanks in advance for any help


sean
Downsizer Moderator


Joined: 28 Oct 2004
Posts: 39234
Location: North Devon
PostPosted: Wed Aug 03, 11 6:25 pm    Post subject: Reply with quote    

Try draining it and putting fresh fuel in. That's fresh from a garage, not fresh from a jerry can that's been hanging around the shed for three years.

Marionb



Joined: 27 Aug 2006
Posts: 5086
Location: Mid-Wales
PostPosted: Wed Aug 03, 11 6:26 pm    Post subject: Reply with quote    

The fuel is fresh...

sean
Downsizer Moderator


Joined: 28 Oct 2004
Posts: 39234
Location: North Devon
PostPosted: Wed Aug 03, 11 6:27 pm    Post subject: Reply with quote    

Oh well. That's the extent of my knowledge. Vegplot or RichardW are probably your men for this sort of question.

Marionb



Joined: 27 Aug 2006
Posts: 5086
Location: Mid-Wales
PostPosted: Wed Aug 03, 11 6:30 pm    Post subject: Reply with quote    

Thanks for trying

It might be an idea to try changing the fuel anyway if nothing else seems to work... I'll wait and see if anyone else has ideas first though.

vegplot



Joined: 19 Apr 2007
Posts: 19920
Location: Ynys Môn
PostPosted: Wed Aug 03, 11 8:01 pm    Post subject: Reply with quote    

Backfiring is a symptom of an incorrect air/fuel mixture and or ignition timing being out.

On lawnmowers the timing is often fixed (depending on the engine design) but some are adjustable. If the points (if it has any) may be worn and require cleaning/adjusting/replacing.

Check the carburettor first. If possible strip it down (get a service kit) and give it a good clean out. YouTube can be a good source of video "how to's" so it's worth checking there first. You'll then need to check the mixture (try this first just in case). There are normally two mixture control screws, one for idle and the other for running. Both are simple to set but refer to your manual (I count YouTube in this definition) for further information.

Jonnyboy



Joined: 29 Oct 2004
Posts: 23924
Location: under some rain.
PostPosted: Wed Aug 03, 11 8:53 pm    Post subject: Reply with quote    

If it was overfuelling wouldn't that show up if the spark plug was examined?

baldybloke



Joined: 24 May 2008
Posts: 1209
Location: Wiltshire
PostPosted: Wed Aug 03, 11 9:02 pm    Post subject: Reply with quote    

Sounds like the ignition timing to me but you could start with changing the spark plug and working backwards towards the points or ignition unit.

vegplot



Joined: 19 Apr 2007
Posts: 19920
Location: Ynys Môn
PostPosted: Wed Aug 03, 11 10:08 pm    Post subject: Reply with quote    

Jonnyboy wrote:
If it was overfuelling wouldn't that show up if the spark plug was examined?


Yes, it's a good indicator if you're familiar with the state of the spark plug when the engine is running normally.

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