I am not a mechanic or a representative of any motorcycle or tool manufacturer or anything else official. This page is only my notes on doing this procedure myself. Although I believe what I have documented here is correct, I make no promises and you do this at your own risk.
Servicing your spark plug is part of the regular service schedule for your bike. At the specified intervals, you should clean or replace it, and check the spark gap size.
- Rear stand (recommended)
- Phillips screwdrivers
- Hex wrenches
- Metric sockets
- Spark plug socket (the one from the bike tool kit will do)
- Torque wrench
- Spark plug gap gauge or feeler gauge
- New spark plug or cleaning equipment
Difficulties & Warnings
Some difficulties could be:
- Over-tightening when re-installing the plug. Use a torque wrench.
- Cross-threading when re-installing the plug.
- Breaking the plug by trying to use a regular (non-spark-plug) socket.
First you must
Now you can see the white porcelin top of the spark plug.
Advice added from a commenter “Z” (thanks): Before the next step, use compressed air to blow away any grit or debris sitting on the engine cover near the spark plug. Otherwise, when you remove the plug, this may fall into the cylinder.
Here is the used, dirty, spark plug.
Replace it with a new one (part number from your manual), or clean the existing plug if it is otherwise undamaged.
If you do this often, or have more than one small engine in your life, and have compressed air, it is worth buying an air-powered spark plug cleaner. I found one for about $20 on eBay.
This is the same plug, cleaned in the cleaner, which works like a small sand-blaster with a fine grit.