WTF Ever hear this
WTF Ever hear this
Seasoned HDF Member
Joined: Aug 2009
Posts: 9,243
Likes: 3,267
From: west Michigan
Or maybe pre-ignition, also known as detonation or pinging. I haven't encountered that in a long time but I think I would reduce the gap to .035 on the new plugs and check them after a few hundred miles, or enrich the fuel/air mix and have a better, cooler running bike.
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Road Warrior
Joined: Apr 2007
Posts: 1,406
Likes: 5
From: Sunnyvale, Ca.
Colder NGK DCPR8E
Plug Gap Spec. is .038 - .043 Went to a colder plug NGK DCPR8E .040 gap
Got this off the net:
http://www.ngksparkplugs.com/tech_su...2.asp?mode=nml
Pre-ignition
Pre-ignition occurs when the air-fuel mixture is ignited by a hot object / area in the combustion chamber before the timed spark event occurs.
When the spark plug firing end (tip) temperature exceeds 800°C, pre-ignition originating from the overheated insulator ceramic can occur.
Is most often caused by the wrong (too hot) heat range spark plug, and/or over-advanced ignition timing. An improperly installed (insufficient torque) spark plug can also result in pre-ignition due to inadequate heat transfer.
Pre-ignition will dramatically raise the cylinder temperature and pressure and can melt and hole pistons, burn valves, etc.
Outstanding HDF Member
Joined: Jul 2009
Posts: 2,447
Likes: 0
From: Danville Va, Providence NC
What brand of plug do most of you guys use? I have autolites in my Sporty, but my Father always ran NGK. I know some running the platinum quads. Does it really make a difference? And what heat range would a stock 883 (with S&S E) be most happy with?
Glad I saw this thread, still learning about pinging. My HD is running fine, just wondering what the most popular opinion is.
Thanx in advance, RD.
Glad I saw this thread, still learning about pinging. My HD is running fine, just wondering what the most popular opinion is.
Thanx in advance, RD.
Tourer
Joined: Mar 2009
Posts: 485
Likes: 1
From: Born and raised in the NC Mtn's
I've run both NGK and Autolites and have no complaints about either. NGK's in the carb'ed sporty and Autolites on the EFI bikes.
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Road Master
Joined: Aug 2008
Posts: 898
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From: Slidell, Louisiana
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