Optimized and lightened full cheek racing crankshaft suitable for manual Puch X30 NS and NL, Velux, MV50, MKII, Maxi HP2 and Custoim mopeds / mopeds with Z50 engines.
This special crankshaft has 1 mm more stroke and gives your engine more torque and compression to tease the last power reserves out of the cylinder.
The precisely fitting 913 gram full cheek crankshaft has proven itself in our latest test series and delivered uncompromising power.
In addition to the balancing holes in the cheeks, the lower connecting rod bolt is also sealed with an aluminum insert for maximum pre-compression. The solid connecting rod with the stable 16 mm connecting rod bolt is also sealed with an aluminum insert. In addition, the polished connecting rod ensures optimum flow behavior of the air-fuel mixture and the additional lubrication slots guarantee clean running even at high engine speeds. The lightened cheeks on the inside ensure even better balancing and therefore smoother running.
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 can 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 to prevent the connecting rod from protruding.
Dimensions of the racing shaft:
Total length of clutch-side crankpin: 58 mm
Total length of clutch-side crankpin: 67.5 mm
Length of 1st shoulder (clutch-side): 19 mm
Length 2nd shoulder (clutch side) 18.5 mm
Ø 1st shoulder (clutch side): 17 mm
Ø 2nd shoulder (clutch side): 15 mm
Thread (coupling side): MF10x1 mm
Length of shoulder (on coupling side): 18 mm
Ø shoulder (on coupling side): 17 mm
Thread (on end face): MF10x1 mm
Ø crank webs: 69.8 mm
Width crank webs: 34.3 mm
Ø connecting rod eye top: 15 mm
Ø connecting rod pin bottom: 16 mm
Length of connecting rod (center-center): 90 mm
Stroke: 44 mm
Weight (incl. connecting rod): 913 grams
Dimension needle bearing: Ø 12 / 15 x 14.7 mm (axe 12)
The needle bearing is included in the scope of delivery.
The matching bearings and oil seals can be found under accessories.
Note: The fit for the clutch hub is very precise. You may need to apply a little pressure to insert the hub. The clutch hub with item number 32380 is not compatible with this crankshaft.
Alternative to Puch spare part number: 350.7.10.015.0, 349.1.10.215.0
Quality product from the Portuguese manufacturer Rito.
| Manufacturer | Rito |
| Material | Steel, Aluminum |
| Area of application | High End |
| Cheek type | Full cheeks |
| Crankshaft stroke | 44 mm |
| Connecting rod length center-center | 90 mm |
| Total length of crankpin on clutch side | 58 mm |
| Weight | 913 g |
| Total length crankpin ignition side | 67.5 mm |
| Thread type | MF10x1 (fine pitch thread) |
| Ø crank webs | 69.8 mm |
| Ø Connecting rod eye | 15 mm |
| Ø piston pin (B) | 12 mm |
| Ø Bearing seat (clutch side) | 17 mm |
| Ø Bearing seat (ignition side) | 17 mm |
| Thread length | 8.5 mm, 12 mm |
| Dimension needle bearing | 12 / 15 x 14.7 mm (axe 12) |
| Wide crank webs | 34.3 mm |
| Length 1st paragraph | 19 mm |
| Length 2nd paragraph | 18.5 mm |
| Ø 1st step (on the coupling side) | 17 mm |
| Ø 2nd shoulder (on the clutch side) | 15 mm |
| Length of shoulder (ignition side) | 18 mm |
| Number of gears | 2 pcs |
| Alternative version of the Puch OEM number | 350.7.10.015.0, 349.1.10.215.0 |
| Puch | Z50 (X30 Sport) Z50 (X30 Velux) 2-speed MS, MV, MV50 |
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