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Hi! I just installed a slimline cooler/thermostat adapter on a '99 Harley Road King. I rode it about 15 miles in cool weather (low 60's, cloudy) at 50mph-60mph. After the ride, the filter was warm to the touch as usual but the cooler and the cooler rows were still cool to the touch. Is it possible that the low ambient temperature didn't let the oil get hot enough to open the thermostat, or should the oil gotten hot enough at that point?
Sounds fine to me, the thermostat should only open above a certain oil temp. Hopefully you'll get a hotter day before long and can try it out in conditions when it does wake up and shows that it works!
Unless you are running in an extremely cold environment, why install a thermostat? At one point, Jagg's FAQ page indicated thermostats are not really necessary, and they make them mainly to satisfy customer demand. Today it's worded a little more carefully.
Do I need an oil cooler? Only if your motorcycle gets hot.
Do I need a thermostat? If you wish for your oil to bypass the oil cooler until engine oil temperatures reach circa 190şF, then choose a thermostat.
The kit comes with the oil filter/oil line adapters and it includes a built-in thermostat. Being in Southern/Central California I probably wouldn't have ADDED a thermostat but in this case it is part of the overall package.
It takes a good 20-25 mile ride for my thermostat (165*) to open when it's 60* out. Take it for a bit longer ride and the cooler should be getting warm.
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