replace the head gaskets. dont run it like that youll blow it up! mine just did the same thing recently and it runs fine after puttin new gaskets in it.
2001 Blaster: Lone Star +4" roundhousing swingarm, Works Dual-rate fronts, Graydon Proline pipe and silencer, Trenga Racing's oil injection block off kit, RK "RX" 108 link chain, 18x11x8 turfs on douglas rims, 20x6x10 holeshots on douglas rims , Aktive reeds, Trenga Racing billet reed spacer, DynoJet race needle & jetts, UNI dual-stage filter, Motion-Pro brake cable for extended swingarm, Talon 40t rear sprocket, Renthal 14t front sprocket, ProDesign kill switch, Renthal yz125 bars w/ MSR grips, shaved front plastics. Lots more to come....