The recent hot weather is causing concerns as my MC21 (300 motor with big triple core radiator. No fan until I figure how to shoe horn one in what little space I have) is running very hot.
It has Motul coolant and the level is fine. Stripped the Coolant pump and it spins when kick start is depressed.
On regular roads I can keep it around a nice 55 Deg but on any motorway distances the temp creeps up to hi 50's and even 62 Deg due to constant throttle and little deceleration. Outside temp 28 Deg.
I don't recall this problem last year and no fan has never been an issue before (no commuting)
Does coolant have a useful life?
How about just water?
I know you racers have to use water for different reasons but if you could choose what would you use?
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