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LOL @ 24 hours in 100 degree temps. My Idle drops off almost instantly at a stop, and if its more than 90 degrees out I have to blip the throttle or the bike will stall at every stop light that is longer than a minute or so. But, I guess thats what I get for running thunderheaders without re-jetting.
HD doesn't specialize in oils/lubricants and a reason why i use Mobile products. EVERYBODY knows that synthetic lubricants are designed for extreme operating conditions in mind. I wouldn't run 20w50 in the tranny of my sportster for 10000 miles but i use 75w90 M1 so thats a perfect range and that's probably not even stressing the oil performance even at 10k. Many cars and trucks run M1 75w90 for 100k miles and as a previous auto wrench, nobody changes rear end lubricant other unless you have to tear it down for leaks, gears etc. I generally have to drive in stop and go traffic for about 10 minutes a day and i can't stand that so i will go out of my way several miles just to not have to stop and go. Cruising around town at 35mph or less is about as boring as it gets on a bike.
I remember many years ago on a sunday tv program, They were showing the rigorous testing Harleys went through. One of the tests was letting the bike idle for 24 hours straight in 100 degree desert temps.
I remember a documentary about HD's development of the VROD where it was tested for overheating in extreme circumstances.
The basic Sportster engine design, overhead valve, 45 degree, air-cooled, common crank pin, unit engine/transmission case v-twin dates back to 1952, if I recall correctly, with the K model. This was well before the invention of global warming, so overheating wasn't a problem until Al Gore came along.
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