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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: Cafe racer on October 01, 2020, 09:57:15 PM

Title: Cooling fan temp on/off
Post by: Cafe racer on October 01, 2020, 09:57:15 PM

Checking the cooling fan operation. I had the bike idle untill the fan came on, gauge just above the centre, it run for only a minute, and gauge dropped to centre, this cycled a few times, I pointed my temperature measurement gun at the water pump, 105°c before tha fan, then when fan stopped it was 95°c again I cycled this a few times, the bike was in direct sun and ambiance temperature was around 26°c

So is this normal? Looks ok to me...

Title: Re: Cooling fan temp on/off
Post by: blackie1 on October 02, 2020, 03:29:08 AM

sounds like it is operating correctly

this from

https://ibmwr.org/index.php/2007/06/01/cooling-fan-diagnostics/

regarding two valve K bikes

 according to the 93 K75S Owners' Manual:

Thermostat starts to open at 85 C                (185 F)
Fan Cut-in at 103 C                              (217 F)
Overheat Warning Light at 111 C                  (232 F)
Pressure relief valve opens at 120 C/1.1 bar     (248 F/16 psi)
Vacuum relief (return valve) opens at -0.1 bar   (-1.45 psi)