99 evo overheating
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Stage III
Joined: Jul 2012
Posts: 3
Likes: 0
From: Ohio
99 evo overheating
When I left for work one morning my bike started running rough, so a mile down the road I turned around. In the 2 mile trip my pipes turned a blue/purple color. From what I've looked up this means it's running lean. It's both pipes evenly. I replaced the rubber intake gaskets, and the little vaccum seal. I'm wondering if my carb brought up some debris, any second opinion would help. Thanks!
Elite HDF Member
Joined: Sep 2007
Posts: 4,468
Likes: 12
From: Bluffton, South Carolina
Check the timing first as it's the easiest. Just remove the cover and see if there is any indication of the plate moving. If not, then it's time to check the fuel system out. Look at the vents, fuel lines, petcock vacuum, and then the carb.
John
John
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Stage III
Joined: Jul 2012
Posts: 3
Likes: 0
From: Ohio
It has a mechanical advance, and one of the springs is broke. I've gotta figure that's what is wrong. The accelerator pump needs replaced, but the carb was a lot cleaner than I expected. Thanks for your help. Don't ask why it has a mechanical advance 
Road Captain
Joined: Jun 2012
Posts: 533
Likes: 2
From: Virginia
"Mechanical advance" on a '99 EVO? You don't have an electronic ignition?
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Stage III
Joined: Jul 2012
Posts: 3
Likes: 0
From: Ohio
Yes, it is currently running on points and condenser. The ignition module quit on me completely, and left me stranded. I'm pretty happy with the the older ignition, until my recent problem, but at least it still got home under it's own power. I'm running the factory coil, and I still have the ignition module on it because that's what the coil bolts to. I will probably go back to the factory design, I just needed something to get me through the season.
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Road Captain
Joined: Jun 2012
Posts: 533
Likes: 2
From: Virginia
Yes, it is currently running on points and condenser. The ignition module quit on me completely, and left me stranded. I'm pretty happy with the the older ignition, until my recent problem, but at least it still got home under it's own power. I'm running the factory coil, and I still have the ignition module on it because that's what the coil bolts to. I will probably go back to the factory design, I just needed something to get me through the season.
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Stellar HDF Member
Joined: May 2009
Posts: 2,856
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From: Middle of Kansas
I changed my old 84 Sportster to points when the ign. module went bad on it, and I think it ran better than before. I did change to the points type coil as they do operate at a different secondary voltage. I carried a spare points and condenser with me, but I never needed it in 20,000 miles. At least if it did quit I could fix it, and it was $35.00 instead of $145.00.
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