screaming eagle "high compression" plugs.
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2nd Gear
Joined: Jun 2010
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screaming eagle "high compression" plugs.
I just got a new set of plugs for my 05 1200r from the dealer. I asked for screaming eagle plugs and the salesman asked if I wanted the high compression ones. I said sure, whats the difference. I installed em, bike runs fine and sounds fine. I pulled one after 20 miles to check the condition becuase the box said for race applications that run a richer mix to see what they looked like. They looked like the bike is running a bit lean. Is this normal for these plugs? The bike was fine with the regular plugs. Should I just switch back or fiddle with my mixture screw?
I'm going to go out on a limb and say that the high compression plug is running hotter than a standard style plug due to it's different insulator design. I have been told that with the high compression plugs you need to run 1 to 2 steps colder plug compared to a standard plug.
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Joined: Jan 2007
Posts: 15,788
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From: along the shore of Mishigami
+1 on the thought about those plugs being one or two steps colder. Pull them again in a couple hundred miles. Typically a colder plug doesn't maintain the heat to "burn" off deposits, probably didn't say that right.
Elite HDF Member
Joined: May 2009
Posts: 4,904
Likes: 9
From: Streetsboro, Oh
I have the SE 10mm plug wires since they look cooler and were only $20.00, but I always use the stock HD plugs. I use OEM plug in everything unless the engine is built like crazy. You should be fine with thoes plugs.
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