Well, I wouldn't attempt it. I've done the low temp thermostat mod on my cars but won't consider it on my bike. The reason being is that the amount of coolant in a bike's cooling system is so much less than a cars. Yes, you coolant will be cooler if you use a lower temp thermostat but overall you risk overheating your engine. The reason being is that the coolant is circulating much too fast which won't allow time for the proper thermodynamic heat transfer to occur between the engine block and the coolant. In a car you're talking about several gallons worth of coolant. I would look to using heat transfer enhancements like Redline Water Wetter, better cooling fans, or wiring in a manual switch so you can activate the fan earlier before the coolant becomes heat soaked.
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