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: Valve specs for VT 500 honda shadow 1983
Hi,
Your valve clearances should be:
Intake .08-.12 mm (.003-.005 in)
Exhaust .12-.16 mm (.005-.006 in)
I usually start all gaps in the middle of given specs, then fine tune from there.
Hope this helps
SOURCE: 2207 Honda Shadow 750--need to know spark plug gap
Hi and welcome to FixYa,
To my understanding, sparkplug gap should be 0.8 ~ 0.9 mm (0.03 ~ 0.04 in).
Good luck and thank you for asking FixYa.
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