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No...no...no. Not now, not ever. Took my 65 to 118K before putting her to bed for a rest. As long as you keep up with servicing on the suggested schedule, the stock system works great.
And the only modification I made to my primary is that now it is vented. The 1965 - e1966 aluminum primary units for Big twin medals was non-vented which led to leaks. HD fixed the problems with a vented primary and sold a retro-fit kit for the early models
My 66 was isolated, my 82 is, my 72 is and of course my TWINKIE is. I agree its not a disaster to leave it in the system but if it was such a brilliant idea they wouldn't have gone to an isolated setup over time. The isolated setup also allows you to run a different product in the primary, if you so desire and you can tell what's leaking in an instant by the color, not to mention the other benefits.
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.
Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.
Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.
