Tracer 900 Air filter+spark plug change (Part 2)

[@normanlai]

My mechanic prefers to change the coolant and spark plugs together front the front. Saves a lot of time removing all the items from the top.
Usually around 40k then the air filter gets washed and and throttle body sync. This is more expensive due to man hours.
Example is this video.
czcams.com/video/UsFPk2W5PVg/video.html

[@rockyp3917]

What's the size of that spark plug spanner/tool

[@yudiriders7878]

ı think 16mm