Question about 1993 Harley Davidson FXR Super Glide
What grade of gasoline are you running? I run only high octane fuel to prevent spark knock which is what you may be hearing.
On your Evolution engine, you have tappets, rocker arms, and pistons that could be source of your noise. However, most of these items will make a noise from idle RPM on up. At about 25 to 30 thousand miles, Evo engines have a nasty habit of losing tappet rollers. The make a very loud noise when they go bad. The roller locks up and usually destroys the camshaft as well.
Now there is one thing that could be making your noise at 3K and up. If you or someone else has put a set of "torque cones", "power cones", or "anti-reversion cones" in the exhaust pipes, these may be the source of your noise. You'll just have to try to narrow down the area that the noise is coming from.
Posted on Aug 04, 2010
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Posted on Jan 02, 2017
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