duck
Life time member
Number of posts : 4462
robmack wrote:I think you should stop and wonder why you want to do this, add this thermostat.
The temp sensor on the K-bike is designed by professional engineers to operate in conjunction with the ECU according to the demands of the engine. The engine temperature can't be too cold otherwise performance and fuel economy are impacted.
Riders add a manual switch to occasionally override the temperature control function of the ECU when they know the bike will potentially overheat - stuck in stop-go traffic on a very hot day. That way they can get a jump on the rising temperature and mitigate a potential problem. Your thermostat will cycle the fan sooner than designed, in all weather, causing coolant temperatures to drop and therefore engine temperatures to decline. IMO it's not a great idea.
The thermostat doesn't cycle the fan, the Motronic does.
I agree with the "it was designed to run at "X" temperature" when it comes to replacing the thermostat with a cooler one but the factory thermostat is designed to operate at 85 degrees (185F) and the fan kicks in at 105 degrees (221F).
When the bike is cruising along the thermostat usually controls the heat and keeps the bike running at around 85 degrees so if you add an additional fan switch that is set to kick in at 85 or above then the bike would still be running within the design temperature range but the fan might just kick in more often when slowed or stopped.
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Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
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94 K1100RS
93 K1100LT
91 K1
93 K75S (K11 front end)
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