Bike crank but wouldn't start.

[zirconxi_imp]

Thanks Max for the heads up. My cover was off easily with the help of a small plastic tube. i use it as separator when i screw in from the hole use to turn the crank. as the hole screw going in, it push the tube against the bolt use to hold the crank pulse rotor (the gear thingy with missing tooth), thus pushing the cover out. After sensor replaced, the bike fired up right away with the new crank sensor without any problem. Only issue is I have to redo the installation as I had done the gasket dressing wrong the 1st time (only dress the outer perimeter of screw hole). after i packed everything and then realized the oil might leak thru the screw holes, so i redo the dressing again focusing on inner perimeter of screw hole. Anyway, thanks everyone help for solving my problem. Will start to ride tomorrow once my gasket is cured fully. Problem consider solved...