I just rebuild the top end of my blaster motor. Granted this is my first blaster but not my first bottom end rebuild. I had to split the cases and to get all the pieces from the old piston out. Everything came apart just fine and went back together. I also installed the Vitos oil block off kit. After a few kicks it fired right up on choke then died. I looked at the side case where the oil pump used to be and the case was leaking oil. Please help I just got this blaster a week ago and want to get it running. Does the oil pump side case cover have a gasket?? According to the schematics it doesn't. The Vitos directions didnt indicate whether the flat side of the block off plate goes up or down.