was riding my bike today and it started making a i kind off hissing noise thought it was the fan at first but then i held it and started the engine and it still did it. then i though the exhaust gasket could be leeking so i seeled that up still there is a noise. i dont have a clue what it is. i need help. this is only the second time ive riden it and i looks like it is buggered already

Does the "hissing" continue once you shut the motor off? Is this with the motor hot, or freshly started?

Are you sure the lid on your water cooler is on properly i know they are a bugger to get on and off that could be it the water boiling up ?

flywheel scrubing of the case?

think it is sorted now turned out it was the exhaust gasket leaking. the silicone has dryed now and the noise has stoped