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High-end crankshaft with 1 mm additional stroke developed by a Swiss high-end tuning company and built by the best manufacturer to fit Sachs 503, 50 (without blower) and 50/3 engines.
The shaft can also be used in the 50/2 (also known as 502) engine with minor modifications.
High-quality and precisely fitting, 1026 gram full cheek crankshaft with polished connecting rod, which has proven itself in various load tests. Designed for use in engines with a large power increase and tested up to 19,000 rpm.
The high-end crankshaft is designed for Sachs 503 engines and has the correct length of the clutch-side cheek pin, which is 3.5 mm longer than that of the Sachs 50/2 crankshafts currently in circulation.
The large balancing holes in the cheeks have been sealed with aluminum inserts for maximum pre-compression.
Dimensions of the crankshaft:
- Total length of the clutch-side crankpin: 43.3 mm
- Total length of the crank pin on the ignition side: 63.5 mm
- Length 1st shoulder (clutch side): 21.3 mm
- Length 2nd shoulder (on the clutch side) 14.2 mm
- Ø 1st shoulder (clutch side): 15 mm
- Ø 2nd heel (clutch side): 12 mm
- Thread (on the coupling side): MF10x1 mm
- Length of shoulder (on the coupling side): 34.6 mm
- Ø heel (on the end face): 15 mm
- Thread (on the end face): MF10x1 mm
- Ø crank webs: 84.8 mm
- Width of crank webs: 29.8 mm
- Ø connecting rod eye at top: 16 mm
- Ø Connecting rod pin at the bottom: 16 mm
- Connecting rod length (center-to-center): 85 mm
- Stroke: 43 mm (+1 compared to original shaft)
- Weight (incl. connecting rod): 1026 grams
- Dimension needle bearing: Ø 12 / 16 x 15.7 mm (axe 12)
The needle bearing is included in the scope of delivery
You can find the matching bearings and oil seals in the accessories section.
Installation tip:
- The transition between the crank webs and the crank pin is provided with a slight radius for reinforcement. To ensure clean spacing, a Ø 16 x 1 mm spacer washer should be used on both the left and right-hand sides; these are placed neatly over the chamfer and are therefore perfectly centered. The other spacers can be used normally with Ø 15 mm.
- The crushing edge should be checked in all cases and adjusted with cylinder base gaskets of different thicknesses if necessary.
Quality product from the Portuguese manufacturer Rito.
| Manufacturer | Rito |
| Weight | 1026 g |
| Material | Steel, Aluminum |
| Cheek type | Full cheeks |
| Thread type | MF10x1 (fine pitch thread) |
| Crankshaft stroke | 43 mm |
| 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 |
| Thread length | 8 mm, 11 mm |
| Ø Connecting rod eye | 16 mm |
| Area of application | Tuning, Racing |
| Ø piston pin (B) | 12 mm |
| Ø Bearing seat (clutch side) | 15 mm |
| Ø Bearing seat (ignition side) | 15 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 |
| 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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