TGB Blade 250 ATV Quad Service Repair Manual, Page 131Get this manual
11CRANKCASE CRANK Clean the crankshaftApply layer of grease on the lip of oil seal, Puts on the left crank shaftInstall the oil seal in the left crankcase with care not to damage the lip of the oil seal
oil By oil seal driver (27x427), seal will knock into locatedSpecial tool: Oil seal driver )