Spark Plug frequency
Road Warrior
Joined: Aug 2010
Posts: 1,268
Likes: 8
From: Detroit, the asshole of America
Unless the bike is tuned way, way out in left field, there is no reason you can't get 50k out of a set of plugs. If you're really cheap, tighten the gap up when it misses on cold starts or under high load consistently to get another couple thousand out of them. 
Ultimate HDF Member
Joined: Jan 2008
Posts: 7,476
Likes: 5
From: Republic of Texas
Good point of using antisieze. There are a lot of people that don't have the experience of trying to pull hot plugs out of aluminum. I always use antisieze but I seen an article about people over torquing by hand with antisieze. I recommend using a torque wrench when possible the right way. To comment on plug intervals. I use to change plugs at 5000 miles but went to 10,000 miles. I wonder how many here actually check gap before installing new plugs?
While we are on sparkplugs, a good idea on all bikes but especially the newer ones that run hotter is to put some anti-seize on the plugs! Even if new, warm the bike up and ease the plugs out and put the anti-sieze on. When you do have to replace plugs later on it may save you from galling the threads on the plug or more likely stripping the threads in the cylinder head.
They are supposed to put anti-seize on the plugs at the 1000 mile service and the 5000 mile at the dealership but always asked to be sure!
They are supposed to put anti-seize on the plugs at the 1000 mile service and the 5000 mile at the dealership but always asked to be sure!
Road Warrior
Joined: Feb 2009
Posts: 1,519
Likes: 2
From: St. Augustine Florida
Seasoned HDF Member
Joined: Sep 2008
Posts: 46,845
Likes: 22,534
From: Land of the Free, Home of Jack Daniel's
Stellar HDF Member
Joined: Dec 2009
Posts: 2,913
Likes: 2,542
5K for me too. Hell, they only cost $1.99 at Autozone. Here's a link to a plug interchange chart. If I'm not mistaken, those high priced HD plugs are made by Champion anyway.
http://www.nightrider.com/biketech/hdsparkplugs01.htm
http://www.nightrider.com/biketech/hdsparkplugs01.htm
Cruiser
Joined: Aug 2007
Posts: 137
Likes: 0
From: Iowa
start of every riding season in the spring. i know they may not need it bit they don't cost that much
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