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No I'm not.
When I installed them I was new to Harleys and a friend helped me.
I didn't even know you needed to check them back then.
Neither did I, and I found out the hard way. Now I test any of them by setting up two straight edges and rolling the rods on them while watching for any "wobble".
I just re-read this post. From your description, I would first look at a leak coming out of your air filter, caused by blow-by, because your Evo is a head breather. If you have a leaking O-ring, you will have a leak at any speed and any distance. Because you said it only happens when you are running long distance, this makes me think you may just have a little bit more oil in the tank. At higher speeds, oil mist return at the head doesn't work fast enough, and with air moving through your air filter, it may pull some out and land on rear intake PR cover, making it look like you have a leak.
So, I would wipe it down. Go on a short ride, and re-check. Might save you some grief and $$. Good luck.
edit: If your 98 Evo is running good, and has enough power for you, I would leave it alone and ride the heck out of it. 98 Evos are the closest thing to perfection for HD. :-)
I think you may have hit on the problem. Definitely worth eliminating as a possibility before you go any further.
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