Question about 1997 Acura CL

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Miss firing engine and black spark plug

The mower starts fine when its running it starts to miss, when i took spark plug out it was black so replaced this ran it again and its starts missing after a short time. Also the plug is black again. iknow your a car expert but its a little 3.5hp straight petrol engine. have selected first car make just to get posted.

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  • Joe Shuler
    Joe Shuler May 11, 2010

    is there any smoke coming from the mower's exhaust? and if so, what colour is it?

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  • Master
  • 1,185 Answers

Is it a two stroke machine , do you mix your own fuel.

If so over dosing on the oil component will cause your problem, check for the right mix levels and follow them.

Is the choke going full back to zero ?

Are you running the right type pf plug for that engine, some run hot some dont

Is the engine running smooth or lumpy.
====================================================================
For a four stroke engine

Your engine may either be running very rich or there is wear on the bores causing oil to get to the electrode.

You can obtain a spark plug extender which takes the plug out of the direct line of fire

Posted on May 24, 2009

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Posted on Jan 02, 2017

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c17hydro_162.gif

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