sounds like a water leak, you may have to split the engine to do this but first take the casing off leaving the kickstart well alone, you will see the variator & the oil pump to the left, the small drive belt drives the oil pump and the water pump, take all this off, you might see an 8mm bolt remove bolt & pullout pump to repair, fit 2 new 'o' rings & push back in. Wemoto.com or adrenalin-pedstop.co.uk for bits.
Chris P.Duck, April 2011