I posted a photo in Jan-2009, of the first iteration SE motor sprocket that I stuffed into my ’09 FLHX- 131. I haven’t had the primary cover off since the 131 and SE sprocket were installed at 255 miles, four years and 44,700 miles ago.
http://www.cvoharley.com/smf/index.php?topic=31769.msg514197#msg514197I inspect the sprocket for serviceability during primary fluid changes. To inspect, I elevate the rear wheel and rock it by hand, in high gear, while inspecting the sprocket for free play through the derby cover opening. At this point my sprocket still has significant tension, without any free play.
Is the sprocket worn? I’m sure it is. Is it serviceable? Sure it is. If the sprocket’s capacity was reduced by 50%, it would still have 350% of the original unit’s capacity. Does the sprocket make some noise? Sure it does, but so do the tires when they become worn, and they aren’t swapped out until they are worn to somewhere near their serviceable limit.
FWIW, a 131 with 45,000 miles makes some noise, and you can induce a racket from the primary drive of a 6-speed Twin Cam with zero mileage. Does that mean that parts should be replaced? That’s hard to say. JMHO.