I have a Whizzer NE5 & has oil leaking from valve cover where cable mounts to mech. that goes through cover for compression release. I just removed engine to plain .070 from cylinder head, ported exhaust, opened up intake restrictor & advanced cam timing one tooth. I also replace valve cover with new cover & gasket. also installed new breather hose that came with cover to repair oil leak. I just got bike back together. It runs awesome, BUT leak is still the same! Still leaking oil out of compression release mechanism. Has any body had any similar problems. It seems weird that new cover would leak just the same, but I don't know what else it could be. Also motor has 125 mile on it.