More EVO problems....
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Novice
Joined: Apr 2015
Posts: 19
Likes: 0
From: CT
So I took the carb off of my buddies EVO, that runs fine, put it on mine and it made no difference. So that rules out all fuel issues. I already changed the module, new plugs, tried his ign wires, mine are also new, tried his coil, no difference, the only thing i havent tried is the sensor plate in the nose cone. I feel like that has to be it. It doesnt appear to be melted (also doesnt look mint either). Before I buy a new OEM one, is there a fair priced aftermarket that would really benefit me?
IF its not that, I really don't know.....
IF its not that, I really don't know.....
Road Warrior
Joined: Jul 2014
Posts: 1,479
Likes: 638
From: Up North
I had a similar problem. Rear plug was dirty, front was lean. I changed the manifold seals. Still ran funny, both cylinders went lean, and timing seemed off. Behaved exactly like yours and it is an FXSTC, almost the same bike. I sprayed around with carb cleaner again and no idle change. Then I sprayed the VOES and it went nuts. Took out the VOES, did a vacuum test on it and it tested fine. Checked the Ohms, all OK. Tested with the lines on and found no leaks. Put it all back together but this time I put clamps on the vacuum hoses. Thing runs like a champ now 
If the line from your carb to the VOES is leaking it will throw off your timing and cause a lean condition. For me this was especially a problem off idle and at low speeds.
If the line from your carb to the VOES is leaking it will throw off your timing and cause a lean condition. For me this was especially a problem off idle and at low speeds.
Road Master
Joined: Jan 2012
Posts: 856
Likes: 9
From: North Carolina
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I just had the same problem on my '94 FXSTC.
It was the HT leads. I changed them for Screamin Eagle fat leads. It cured the problem then it came back, it turned out that the increased diameter of the leads was stopping the connector sitting properly in the coil and it was working loose.
Changed them for smaller diameter Magnecore leads and now the bike runs fine.
It was the HT leads. I changed them for Screamin Eagle fat leads. It cured the problem then it came back, it turned out that the increased diameter of the leads was stopping the connector sitting properly in the coil and it was working loose.
Changed them for smaller diameter Magnecore leads and now the bike runs fine.
Last edited by GMCC Mad Dog; May 24, 2015 at 05:42 AM.
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