MY 450SMR keeps overheating and stalling at lights so I purchased a stock KTM fan from a dealer and just received it. It fits in, but VERY tight! The only problem is the sensor to make the fan kick on is a bolt that goes into the bottom of the radiator and measures the temp. On my SMR the only two holes in the radiator are the two pipes that go into the engine. There are no drain holes! where the hell do i put this thermo?