you should have gotten its engine checked first by some senior mechanic before investing money
regarding water wetness what i heard from an 125 user its an sign of perfect engine
he owned brand new cg 125 euro 2 he said i bought i found out water in exaust i went to
showroom owner complained for it but showroom owner said its sign of healthy engine
so if wetness from your exaust is not oil and if it was oil it should not come in such form smoke
is observed clearly which states weak engine