Size:3/4" 30 Series Description: Our 1" and 3/4" shaft Series 30 torque converter driver clutch assembly for go-karts and mini bikes is a quality replacement item. This bore size will match the size of your horizontal engine drive shaft. The 1/4" shaft key is machined (or "broached") directly into the side of the bore wall, so you cannot lose it during disassembly. Like all Series 30 torque converters, this unit is used with a 3/4" asymmetrical belt (not included). Specifications: Bore size: 1" or 3/4" (depending on which item you pick) Overall diameter: 4-7/8" Broached key width: 1/4"
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