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Ice cold engine of my KTM Duke 200 heats up and shoots the highest temperature and the gauge reaches the extreme within like 15-30 minutes of driving it in traffic. And the engine stops and doesn't start (obviously).

Things I don't do which might cause this-

  1. Useless revs.
  2. Shooting ahead of the traffic showing off the acceleration.
  3. Not keeping the coolant filled.
  4. Not getting the motorcycle serviced on time.

I am not able to figure out the reason for this. At times it does cover 300km and above almost non-stop. Whereas on other days it doesn't even withstand 10km of driving in traffic. Usually, if there's a traffic jam and I have to stand still for 10 minutes, I see the temperature of the engine jumping quite a lot of degrees.

What could be the reason and how do I fix this? Could the 'higher power and comparatively lesser displacement' ratio be the reason?

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Shooting ahead of the traffic showing off the acceleration. Actually, that might help your problem by increasing airflow over your radiator! – dss539 Aug 25 '14 at 14:22
And getting me into an accident sooner as well, right? LOL! – Sandman Aug 26 '14 at 8:24
In my experience, being far ahead of traffic is an extremely valid safety tactic. Where I live, the biggest threat to a rider's safety is the soccer moms in giant SUVs holding a latte and talking on a cell phone while driving with their elbows. – dss539 Aug 26 '14 at 14:21

Looking at a blow apart diagram on your bike, it appears you have two radiators, one on each side of the faring, for your bike. One or both of your radiators may be blocked or partially blocked. Take the faring off and check to see if there is any ash/trash stuck in the fins.

Also, sitting in slow traffic will not allow a good amount of air to come over those fins, which would cause the temp to rise. You would think this would be thought of when the engineers designed the things, but you know the deal. I don't believe your bike has any fans to draw extra air, so this helps exacerbate your situation.

The third thing I'd check is to see if there is an internal obstruction in the hoses going to/from the radiators. Not knowing what year your bike is (to see how old it is), you may need to flush/change the radiator fluid. If you were to change your coolant, put a product like Water Wetter into the coolant which will make it work better.

The fourth thing which may be causing it is if the thremostat is bad. I see the thermostat for you bike runs at 55C (131F). If you are running at or near the redline, this could be a real cause. It could be stuck in a partial open position or not opening fully.

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