Z50 Rebuild Guide

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Taken/translated from puchforum.com

2-speed block overhaul

The reconditioning of a 2speed is more difficult than overhauling an automatic block. The block consists of more parts and is a little more difficult to put together, mainly because of the loose needle bearings. Yet you will see that it all fits together very logically. What you can replace as the reconditioning of a 2speed block, note the prices.

Part Dimensions Units Needed Link
Crankshaft Bearing 17x40x10 2 ?
Gearbox Bearing 15x35x11 1 ?
Lower Coupling* 7x21x7 1 ?
Gearbox Needle Bearing 3.5x3.5x7.5 46 ?
Crankshaft Seal 17x35x7 2 ?
Gear Seal 17x28x7 1 ?
Clutch Plate (Different engines have either 2 or 3 plates) N/A 2/3 ?
Gaskets N/A N/A Treatland

*These are mostly loose balls, but a ball bearing can work.