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Hi Guys,
I'm Lars, from the Netherlands and as I'm having a similar problem with my zx6r 07/08 i'm hoping someone here can help me out.
Last year i bought this bike for track use. Unfortunately a few track days ago I noticed that the fan wouldn't power on. So I by-passed the sensor and made a switch that I can power on/off myself.
But, even with the fan on during the 20 minutes on track it still runs 224-226 degrees (106-108 degrees celcius) with a weather temperature around 68 (20 degrees celsius).
I even noticed the temperature running up to 241 degrees (116 celsius) on a verry warm day with 90 degrees (32 celsius) although I kept the fan running from the start.
So what did I check untill now:
-Thermostat--> it nicely opens full 8mm around 180 degrees.
-Radiator--> warms up everywhere, no cold parts so it is ok
-Flushed the system with a radiator cleaner, after that with water.
-Filled it up with demi-water and added 5% Motul Mocool which should lover the temperature with about 5-10 degrees.
After this the engine still runs to 224-226!!
Sow do you have any other ideas what the problem might be??
Thanks a lot!