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which fits over the exhaust pipe in a pipe-within-pipe configuration
these hubs are the perfect choice for your kart
the drive sprocket fits into the exploded diagram in the photo gallery as part #15
and valve stem cap
22-23 | Rotax Piston Assembly (53.95mm) Rear Hub which fits over the exhaustPiston Assembly for Rotax Max Evo Engines, 53. 95mm diameter. This piston and ring assembly is ideal for Rotax Max Evo racing engines, and includes the piston and associated ring to fit in engines that have been bored and adjusted to 53. 95mm. Each piston is sold with the ring as noted. These are parts 22 23 in the diagram.
