Primary displacement kit for models with 5 & 6 speeds including Dyna & Softail

Unlike the Evolution models, on the Twin Cam it is impossible to shift the gearbox to the left, as the gearbox is bolted to the engine. The Zodiac primary shift kit allows you to shift the entire primary transmission by 12, 25, 45, or 55mm without moving the 5-speed gearbox, and by 25, 45, or 55mm in the case of a 6-speed gearbox. All kits are supplied with an extended primary shaft and an extended 5th gear pinion. With these two components, you can leave the gearbox in its original position but shift the front pulley by 12mm or 25mm, thereby creating the desired space to fit a wider rear tyre. When we say wide, we mean wide. The 12mm primary shift kit allows the use of 200 tyres, retaining the original belt, on all Evolution or Twin Cam chassis; the 25mm kit allows the use of 230 tyres on a 7.50" rim, also on both Evolution and Twin Cam chassis if the original modern narrow belt is used. If you decide to use a chain for the final drive, it is possible to fit a 250 rear tyre on a 9.00" rim. The gearbox shaft and the 5th gear pinion are machined on CNC centres at one of the most important and modern automotive transmission factories in the world. The material used for the shafts and pinions is 20CrMnT, particularly suitable for pinions and highly resistant to fatigue. Once machined, they undergo a heat treatment to eliminate machining fatigue and increase their core hardness to between 35 and 45 on the Rockwell scale, followed by hardening to raise their surface hardness to between 58 and 60 on the Rockwell scale. Our primary shift kits contain: a ring between the engine and the primary, a longer crankshaft extension and a longer crankshaft nut, a longer gearbox primary shaft, a longer 5th gear pinion with needle bearings and a seal, a wider front pulley spacer, a longer clutch rod, a crankshaft extension (only in the 25, 45, or 55mm kits), a starter shaft coupling, gearbox-to-primary spacers, and all the fixings for installation. The 45mm kits come with a main pinion shifted by 25mm and a pulley with a shift of 3/4" (19mm). Wide swingarms and mudguard mounts must be ordered separately; see this catalogue.
 
 Note: The extended 45mm main shaft is used with an elongated primary sprocket with 25mm, a 25mm toothed wheel spacer and a ZPN 193036 offset pulley.


Specifications


Pack
1


HS Code
8714109090


Origin
NL




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