Whats the gap?
SOURCE: spark plug gap
Don't change the setting on the plug. The 400's are happiest when you just plug in new ones and ride. They like NGKs the best. There are two types for the 400. One runs hotter. This choice will depend on which country you live in and what the ambient temperatures are.
SOURCE: spark plug gap
http://www.carlsalter.com/motorcycle-manuals.asp
pdf service manual free download here
SOURCE: I need to know the spark gap for the spark plugs
My 2001 kawasaki vulcan 750 calls for 32-35 gap or0.8-0.9 mm
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