Re: Hole in the middle of the Crank...
Actually my GT5 has thrown the piston way high since the day I got it and the piston smacks the head. I use 2 .020 home made cylinder base gaskets and 2 head gaskets and it runs great. The best way to grease the buck bar and the rest of the clutch shaft is to remove the clutch cable post and insert a m10x1 45 degree angle grease zerk in its place and remove the clutch ring assembly and pump in grease till it just comes out of the bearing on the clutch side. I use a right angle clutch pull and have no use to reinstall the clutch cable post so I leave the zerk in place.