Racing crankshaft with 45 mm stroke, suitable for manual Puch X30 NS / NL and thanks to the double keyway also for Puch X30 Velux Z50 engines.
High-quality and precisely fitting 930 gram full cheek crankshaft.
The balancing holes in the cheeks have been sealed with aluminum inserts for maximum pre-compression.
The following points should be noted when using this crankshaft:
- The use of a 1.0 mm thick stroke plate is essential to compensate for the additional stroke. You will find suitable plates in the accessories section. We also recommend using sealant between the seal and the housing/cylinder. You will also find a suitable sealant among the accessories.
- When installing, observe the crushing edge dimension (distance piston – cylinder head at TDC). This should not be less than 1 mm.
- Due to the longer stroke, the pressure in the crankcase increases. For this reason, the oil seal on the crankshaft end should either be glued in with 2-component adhesive or secured with a retaining plate.
- Running in the crankshaft: Run the engine for 30 minutes under low load with a slightly richer mixture.
- When using 45 mm cylinder kits, depending on the model (with boost ports), the pre-compressed mixture may enter the intake port on UT through the holes in the piston.
- Use with Z50 engines on the Puch X30 NS/NL (Fahrtwindgekühlt): Keyway at 12 o'clock
- Use with Z50 engines on the Puch Velux (fan-cooled): Keyway at 14 o'clock
- The housing must be slightly removed in the area of the cylinder neck so that the connecting rod cannot protrude.
The needle bearing (12/15 x14.2 mm) is included in the scope of delivery.
The matching bearings and oil seals can be found under accessories.
Branded product from the Portuguese manufacturer Jasil under the Top Racing brand.
| Material | Steel, Aluminum |
| Dimension needle bearing | 12 / 15 x 14.2 mm (axe 12) |
| Manufacturer | Jasil |
| Cheek type | Full cheeks |
| Crankshaft stroke | 45 mm |
| Connecting rod length center-center | 90 mm |
| Total length of crankpin on clutch side | 57 mm |
| Total length crankpin ignition side | 66 mm |
| Area of application | Tuning, Racing, Performance |
| Ø crank webs | 69.9 mm |
| Ø piston pin (B) | 12 mm |
| Ø Connecting rod eye | 15 mm |
| Thread type | MF10x1 (fine pitch thread) |
| Wide crank webs | 34 mm |
| Length 1st paragraph | 14 mm |
| Length 2nd paragraph | 15 mm |
| Length 3rd paragraph | 10 mm |
| Weight | 930 g |
| Puch | Z50 (X30 Sport) Z50 (X30 Velux) 2-speed MS, MV, MV50 |
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