403 spark plug recommendations

pontarriere

Member
VIP Paid Subscriber
Fellow Frogger
Joined
Nov 5, 2010
Messages
251
Location
Sydney
Most of the plug manufacturers don't list the 403 any more in their fitment guides, except Champion who list the L86C. I currently have some old Eyquem plugs fitted but they are sooting up and seem to be too cold. Many years ago I had some Bosch W5AC. Any recommendations?
 
Top