If its right there at the thermostat housing. Its usually the little hose. Cheap choice of hose clamps. You should be able to reach in there and try to tighten the clamps. And the top clap on the radiator should be set so you can get at it from the exhaust side of the bike. Hope is just a hose leak or maybe check the air bleed bolt straight above the thermostat housing to make sure its tight.