Running rich?
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Road Master
Joined: Oct 2012
Posts: 777
Likes: 45
From: Beaumont, Ca
Running rich?
I have a 2006 Heritage Classic, fuel injected. I removed both spark plugs, and they were mostly black and sooty. They are HD 6R12. Is this a sign that the engine is running rich. Is there a spark plug chart that shows the range of plugs. Should I run a cooler or hotter plug? Thanks
Road Warrior
Joined: May 2009
Posts: 1,493
Likes: 94
From: Belgium
did you buy it new or second hand?
If bought second hand, the previous owner might have had it tuned and then stripped off the after market exhaust and air filter and replaced with stock items but left the tune on the ECM, before selling it on.
(just guessing here, but usually a stock bike runs lean, not rich)
If bought second hand, the previous owner might have had it tuned and then stripped off the after market exhaust and air filter and replaced with stock items but left the tune on the ECM, before selling it on.
(just guessing here, but usually a stock bike runs lean, not rich)
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Stellar HDF Member
Joined: Mar 2006
Posts: 2,395
Likes: 153
From: Utah
The pipes tell more than plugs with modern gas. Many say that you can no longer read plugs, other than to know that they are firing.
As someone said, they are set very lean due to EPA. The question about whether you bought it used or not is probably what you should answer next. After that, does it run well in your opinion? How many miles are on the bike? What gas mileage are you getting? Is there a piggy back fuel manager or a non-stock ECM under the seat or behind the battery? After that, have someone check the spark strength.
As someone said, they are set very lean due to EPA. The question about whether you bought it used or not is probably what you should answer next. After that, does it run well in your opinion? How many miles are on the bike? What gas mileage are you getting? Is there a piggy back fuel manager or a non-stock ECM under the seat or behind the battery? After that, have someone check the spark strength.
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Road Warrior
Joined: Dec 2008
Posts: 1,733
Likes: 38
From: Linden, NC
Linking a Harley Spark Plug Cross Reference Chart for reference.
Cruiser
Joined: Sep 2012
Posts: 182
Likes: 6
From: Doylestown, PA
did you buy it new or second hand?
If bought second hand, the previous owner might have had it tuned and then stripped off the after market exhaust and air filter and replaced with stock items but left the tune on the ECM, before selling it on.
(just guessing here, but usually a stock bike runs lean, not rich)
If bought second hand, the previous owner might have had it tuned and then stripped off the after market exhaust and air filter and replaced with stock items but left the tune on the ECM, before selling it on.
(just guessing here, but usually a stock bike runs lean, not rich)