Lawn Mower Repairs – How To Tell When Spark Plugs Have Gone Bad

Anne Mehla By Anne Mehla, 12th Dec 2014 | Follow this author | RSS Feed | Short URL http://nut.bz/2wxboxpu/
Posted in Wikinut>Guides>DIY>Tools

Performing lawn mower repairs when they are required is essential to keeping the machine in excellent operating condition. Allowing damage to sit and fester could not only lead to even further harm, it can cause other unrelated problems to occur.

Performing Lawn Mower Repairs

Performing lawn mower repairs when they are required is essential to keeping the machine in excellent operating condition. Allowing damage to sit and fester could not only lead to even further harm, it can cause other unrelated problems to occur. Whilst you should replace the spark plug after every 100 hours of use and before storing the mower for extended periods, you should always keep an eye on it to ensure that it hasn’t gone bad.

A damaged spark plug can decrease the fuel efficiency of your mower, cause the engine to run poorly, leave deposits on the cylinder head and/or cause ignition problems. If you suspect that your plug has become damaged or worn, you should inspect it to see whether a replacement is necessary. If you do need to replace the plug, ensure that you get an appropriate replacement. It can help to take the old one with you for comparison.

We have outlined some instructions to help you safely remove the plug and determine whether it has gone bad or whether some other issue is present.

1. The first step for this lawn mower repair is to disconnect the wire on the spark plug. This will prevent the engine from accidentally starting whilst you’re working on it. You should also remove any dirt or debris that has gathered around the plug with a cloth.

2. Using a spark plug socket, turn the plug counterclockwise and remove it from its housing. Remove any deposits that have formed on the plug using a wire brush; this will not damage the component in the slightest and is actually quite effective at removing stubborn dirt.

3. Carefully inspect the spark plug. If the porcelain is cracked, if it has overly heavy deposits or if the electrodes (the curved and straight pieces on the end of the plug) are missing, you should replace it. Make sure that you choose the correct replacement.

4. Measure the gap between the curved and straight electrodes using a spark plug gauge; the width should be 0.03 of an inch for most ride on models, but you should always check the owner’s manual for your correct length. Bend the curved electrode to adjust the gap (if necessary).

5. Screw the spark plug back into place. Connect the wire to the terminal on a tester and clamp the alligator clip to the plug. Start your lawn mower and watch the spark in the gap on the tester; if the spark is not consistent, you will need to replace the plug.

Once you have completed all of these steps and are satisfied with the condition of your spark plug, you can rest assured that the lawn mower repair is successful. If you have completed all of the steps but are still experiencing problems, you will need to take your mower in for a professional repair. Keep in mind that another issue could be causing the problem; whilst the spark plug is a likely culprit, it is not the only component you should be considering.

Tags

Lawn And Landscaping, Lawn Mower, Lawn Mower Repairs, Lawn Mowers

Meet the author

author avatar Anne Mehla
Anne Mehla is a successful freelance writer for a Melbourne based company called Zeemo. I have experience in writing content on several topics including home improvement, internet and online business,

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Comments

author avatar Sivaramakrishnan A
12th Dec 2014 (#)

I remember my days with a two wheeler and issues with spark plugs. Thanks for the tips - siva

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