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A high-end crankshaft developed by a Swiss high-end tuning company and manufactured by the best producer, featuring 1 mm of additional stroke, compatible with Sachs 503, 50 (without supercharger), and 50/3 engines.
With minor adjustments, the crankshaft can also be used in the 50/2 (also known as 502) engine.
High-quality, precision-fit, 1026-gram full-flange crankshaft with polished connecting rods, which has proven itself in a wide variety of stress tests. Designed for use in engines with significant power increases and tested up to 19,000 RPM.
This high-end crankshaft is designed for Sachs 503 engines and features the correct length of the clutch-side journal; it is 3.5 mm longer than that of the Sachs 50/2 crankshafts currently in circulation.
The large balancing holes in the webs have been sealed with aluminum inserts for maximum pre-compression.
Crankshaft dimensions:
- Total length of the clutch-side crankpin: 43.3 mm
- Total length of the ignition-side crankpin: 63.5 mm
- Length of 1st shoulder (clutch side): 21.3 mm
- Length of 2nd step (clutch side): 14.2 mm
- Diameter of 1st step (clutch side): 15 mm
- Diameter of 2nd step (clutch side): 12 mm
- Thread (clutch side): MF10x1 mm
- Length of step (ignition side): 34.6 mm
- Diameter of step (ignition side): 15 mm
- Thread (ignition side): MF10x1 mm
- Ø crankshaft journals: 84.8 mm
- Crankpin width: 29.8 mm
- Upper connecting rod eye diameter: 16 mm
- Ø Lower connecting rod pin: 16 mm
- Connecting rod length (center-to-center): 85 mm
- Stroke: 43 mm (+1 compared to original shaft)
- Weight (including connecting rod): 1026 grams
- Needle bearing dimensions: Ø 12 / 16 x 15.7 mm (12-axis)
The needle bearing is included in the package.
You can find the matching bearings and oil seals in the accessories section.
Installation tip:
- The transition between the crank arms and the crank pins has a slight radius for reinforcement. To ensure proper spacing, use one Ø 16 x 1 mm spacer on each side; this fits neatly over the chamfer and centers itself optimally as a result. The remaining spacer washers can be used as normal with a Ø 15 mm diameter.
- The crimped edge should always be checked and, if necessary, adjusted using cylinder base gaskets of varying thicknesses.
A quality product from the Portuguese manufacturer Rito.
| Manufacturer | Rito |
| Material | Steel, Aluminum |
| Cheek type | Full cheeks |
| Crankshaft stroke | 43 mm |
| Thread type | MF10x1 (fine pitch thread) |
| Connecting rod length center-center | 85 mm |
| Total length of crankpin on clutch side | 43.3 mm |
| Total length crankpin ignition side | 63.5 mm |
| Ø crank webs | 84.8 mm |
| Ø piston pin (B) | 12 mm |
| Ø Connecting rod eye | 16 mm |
| Area of application | Tuning, Racing |
| Ø Bearing seat (clutch side) | 15 mm |
| Ø Bearing seat (ignition side) | 15 mm |
| Thread length | 8 mm, 11 mm |
| Dimension needle bearing | 12 / 16 x 15.7 mm (axe 12) |
| Wide crank webs | 29.8 mm |
| Length 1st paragraph | 21.3 mm |
| Length 2nd paragraph | 14.2 mm |
| Ø 1st step (on the coupling side) | 15 mm |
| Ø 2nd shoulder (on the clutch side) | 12 mm |
| Length of shoulder (ignition side) | 34.6 mm |
| Weight | 1026 g |
| Sachs | 50 (Fahrtwind, 1.25 / 1.5 hp, DE) 50/2 - L CH (0.8 PS) , ML CH (0.8 PS) , MB (2.6 PS) , MLB (2.6 PS) 50/3 503 - 2AL / 2BL |
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