Quote:
Originally Posted by Noobman
I don't have many "mods" on it, just that "Thermostat switch upgrade" that most people with Duke 690's do. I had run this new thermostat switch for a whole summer in the past as well and there were no problems.
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Is this a
radiator fan thermoswitch? A sensor/switch that turns on radiator-fan at pre-determined temperature? Usually factory is 105C and you can get switches that turn on at lower-temp, typically around 90C? Check to make sure radiator-fan is working! Idle bike and note at what coolant temperature fan turns on.
Black coolant specks sounds like an incompatible chemistry. There's been so many developments in radiator-fluid past couple decades to deal with new all-alloy engines and various waters around World. You'll want to make sure you follow KTM's recommend coolant chemistry. NOT ALL COOLANTS are same, people who say that just don't understand different chemistries involved and how they can interact adversely. Usually this bad reaction is a precipitation of sort where the coolant gels or solidifies. Sounds like it in your case with pink coolant turning into black specks.
When selecting coolant, pay attention to the various terms:
- ethylene glycol
- propylene glycol
- IAT
- OAT
- G05
- HOAT
- silicates
- borates
- phosphates
Select a coolant with mix of these components that's advised by KTM.
Also do compression-check