Lawn Mower Problem

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Lawn Mower Problem

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Marionb

Joined: 27 Aug 2006
Posts: 5267
Location: Mid-Wales

Posted: Wed Aug 03, 11 6:12 pm Post subject: Lawn Mower Problem

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: 42207
Location: North Devon

Posted: Wed Aug 03, 11 6:25 pm Post subject:
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: 5267
Location: Mid-Wales

Posted: Wed Aug 03, 11 6:26 pm Post subject:
The fuel is fresh...

sean
Downsizer Moderator

Joined: 28 Oct 2004
Posts: 42207
Location: North Devon

Posted: Wed Aug 03, 11 6:27 pm Post subject:
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: 5267
Location: Mid-Wales

Posted: Wed Aug 03, 11 6:30 pm Post subject:
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: 21301
Location: Bethesda, Gwynedd

Posted: Wed Aug 03, 11 8:01 pm Post subject:

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: 23956
Location: under some rain.

Posted: Wed Aug 03, 11 8:53 pm Post subject:
If it was overfuelling wouldn't that show up if the spark plug was examined?

baldybloke

Joined: 24 May 2008
Posts: 1388
Location: Wiltshire

Posted: Wed Aug 03, 11 9:02 pm Post subject:
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: 21301
Location: Bethesda, Gwynedd

Posted: Wed Aug 03, 11 10:08 pm Post subject:

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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