You need to buy the specific kind of sparks plugs your bike calls for.
Check the gap requirements and if needed regap the plugs using a gap tool available at any auto supply store.
You'll need a socket wrench. Get the right deep socket for your plugs.
Determine if the bike requires a metric socket or not?
You may need an extender for the socket to get at the plug area.
Clean the area around the where the wires connect to the spark plug to avoid any dirt or foreign stuff getting into
the hole when you remove the plug. I sometimes use a soft brush and blow the dust out or compressed air.
Be sure to mark the wires so that you'll know to replace them on the correct cylinder.
Holding the plug wire firmly by the neck at the plug base, and gently remove the wire so as not to break it's internal
connections. Otherwise you'll be making another trip to get new wires. If your wires are old and cracked etc., you
may want to replace them anyway.
Using the socket wrench, remove the plugs and check them for color and deposits.
Black deposits mean your engine could have problems or is running too rich.
White plugs deposits mean the engine is too lean.
Light gray or tan deposits are OK.
Put new plugs on the bike first by hand so that you can feel the thread as you screw it in. This helps to avoid cross
threading as you can feel the alignment of the threads better. If you can't get your fingers down into the recessed
area where the plug will go, try using the deep socket with an externder on it but without the cocket wrench and
just use your fingers. You will get a better feel for the threading that way. After you have it mostly screwed in,
tighten slightly
with the socket wrench. Do not over tighten as you can break the plug or make it too hard to
remove later. I have
broken plugs (twice, duh!) doing this and I learned the hard way so that you don't have to ...
Ha Ha
Now fire the bike up and listen to make sure that all of the cylinders are firing...
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