Mower spits at me !

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My mower starts first time but, as I go along, it seems to "spit" through the exhaust now and then. Have cleaned and adj the plug to no avail ?
 
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Its much more common for engines to spit back through the air cleaner, due to a weak mixture or whatever, but through the exhaust is unusual! An explosion in the exhaust when the ignition is turned off isn't a worry though.
I'd replace the plug, and check that the silencer isn't loose. Which machine do you have?
John :)
 
Many thanks John. On reflection I think the spit comes from the air cleaner, I just assumed it was the exhaust.
The machine was purchased from Homebase...Sovereign XSZ40, does the job well, am just not used to being spat at from an engine!
 
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For sure, engines spitting back through the induction system is always due to a weak mixture somewhere along the line......not too helpful as the fast running speed mixture is actually fixed by the main jet size.
It may be possible to richen the slow running mixture by turning the idle jet screw (if there is one) 1/4 turn anticlockwise, otherwise there could be a tiny air leak somewhere.
I'd still try a new plug though, even if the machine starts well.
John :)
 

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