Running hot and dieing
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6th Gear
Joined: Sep 2021
Posts: 10
Likes: 3
From: Montana
Running hot and dieing
1999 road king my 80 inch road king is running hot and dies out , let it set for 30 minutes or so and will be good for 20 miles and dies out again I'm needing help and ideas that I haven't tried to get the problem figured out
Grand HDF Member
Joined: Apr 2007
Posts: 3,727
Likes: 3,071
From: Brighton, MI
Maybe you could tell what you did try so we are not wasting time suggesting things you have already tried?
Thought the problem was not as common on the later years, but a failing cam sensor in the nose cone of the cam cover was/is a fairly common issue. Yours does sound electrical as often times electrical components work fine when cool, but fail when they heat up. That would be a good place to start.
You should visually check the cam sensor for the potting medium in that sensor (goo) to see if it is melting or oozing out. Pulling the "V2" cover plate will expose it. Then you can warm up the sensor by either running the engine, or using a hair dryer/heat gun. When warmed up (hot) and the bike dies, check for spark at the plugs. Let cool, then try again. If it's your sensor, no spark when hot, normal spark at room temp. Could be a bad cam sensor even if not "oozing" the goo. More common failures have been the tan colored potting medium, have not seen any posts with the sensors that have black potting medium, but anything is possible.
Lots of threads here with diagnostics and pics on how to trouble shoot that issue. Some are pretty recent. You could also hook up a meter per the troubleshooting cam sensor testing procedures and heat up the cam sensor with a hair dryer, looking for the meter readings to change from a "good" value, to a "bad" value when the sensor gets to operating temps (hot).
Not saying this IS your problem, but a good place to start. Is your bike fuel injected or carbed?
https://www.hdforums.com/forum/evo-c...d-no-fire.html
https://www.hdforums.com/forum/evo-c...-when-hot.html
https://www.hdforums.com/forum/evo-c...de-on-evo.html
Thought the problem was not as common on the later years, but a failing cam sensor in the nose cone of the cam cover was/is a fairly common issue. Yours does sound electrical as often times electrical components work fine when cool, but fail when they heat up. That would be a good place to start.
You should visually check the cam sensor for the potting medium in that sensor (goo) to see if it is melting or oozing out. Pulling the "V2" cover plate will expose it. Then you can warm up the sensor by either running the engine, or using a hair dryer/heat gun. When warmed up (hot) and the bike dies, check for spark at the plugs. Let cool, then try again. If it's your sensor, no spark when hot, normal spark at room temp. Could be a bad cam sensor even if not "oozing" the goo. More common failures have been the tan colored potting medium, have not seen any posts with the sensors that have black potting medium, but anything is possible.
Lots of threads here with diagnostics and pics on how to trouble shoot that issue. Some are pretty recent. You could also hook up a meter per the troubleshooting cam sensor testing procedures and heat up the cam sensor with a hair dryer, looking for the meter readings to change from a "good" value, to a "bad" value when the sensor gets to operating temps (hot).
Not saying this IS your problem, but a good place to start. Is your bike fuel injected or carbed?
https://www.hdforums.com/forum/evo-c...d-no-fire.html
https://www.hdforums.com/forum/evo-c...-when-hot.html
https://www.hdforums.com/forum/evo-c...de-on-evo.html
Last edited by Yankee Dog; Sep 11, 2021 at 07:03 AM.
Seasoned HDF Member
Joined: Aug 2008
Posts: 5,081
Likes: 2,159
From: Ohio
98 was the last year for the Evo in a Roadking, 99 became a twincam using the crank sensor for ignition and fuel control. If it's a Evo follow Yankee's advice because the cam sensor is known to melt.
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