Hi. I am rebuilding my engine begging of next week as my big end bearing went and took the piston and bore out with it. I think it partly to do with the oil pump not adjusted correctly. I was thinking of blocking off the pump and mixing the petrol and 2 stroke myself. Does anybody know the best mixture for a mallossi MHR 172 kit with a pm tuning race crank and 25mm carb Running in mixture and normal mixture would be much appreciated Thanks Luke --- I am here: http://maps.google.com/maps?ll=51.866124,0.341112 Sent from my iPhone using Tapatalk