SOURCE: need to replace the spark plugs
The top of the engine has a cover remove to see ignition coils. Remove wires then coils, plugs are under coils. This is called coil on plug system. Make sure engine is over night cold before you do this, aluminum heads are easy to pull threads when they are hot. Always replace with OEM plug cheap plugs burn out coils !!!
SOURCE: What is the spark plug gap for the 4agze mk1
If you don't have the manual then use a saw blade(usual blue colour that cuts metal etc)as gap thickness,always work this way.However this greatly affects performance and pull up speed,so if you're eager about this then look for the right manual.Hope this helps.
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