High-end racing crankshaft suitable for Puch Maxi S / N, as well as Supermaxi LG1 mopeds with a 1-speed E50 engine.
This special crankshaft has 1 mm more stroke, the additional stroke gives your engine more torque and compression and thus tickles the last horsepower out of the cylinder.
High-quality and precisely fitting, 975 gram full cheek crankshaft, which has proven itself in various load tests. This was designed for use in engines with a large increase in power. All balancing holes in the cheeks have been sealed with aluminum inserts for maximum pre-compression. The solid connecting rod is fitted with a more stable 16 mm connecting rod bolt. In addition, the connecting rod bearings are silver bearings, which have excellent emergency running properties.
The following points should be noted when using this crankshaft:
- The use of a 0.5 mm thick stroke plate is essential to compensate for the additional stroke. You will find suitable models in the accessories section. We also recommend using sealant between the gasket and 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 the retaining plate in the accessory.
- 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, pre-compressed air may enter the intake port through the holes in the piston.
Dimensions of the crankshaft:
- Total length of clutch-side crankpin: 74 mm
- Total length of clutch-side crankpin: 66 mm
- Length 1. Heel (clutch side): 9 mm
- Length 2nd heel (clutch side) 14.5 mm
- Length 3rd heel (clutch side) 25 mm
- Ø 1st heel (clutch side): 22 mm
- Ø 2nd heel (coupling side): 17 mm
- Ø 3rd heel (clutch side): 15 mm
- Thread (coupling side): MF10x1 mm
- Length of shoulder (on coupling side): 26.3 mm
- Ø shoulder (on the coupling side): 17 mm
- Thread (on end face): MF10x1 mm
- Ø crank webs: 69.9 mm
- Width of crank webs: 34 mm
- Ø connecting rod eye top: 15 mm
- Ø connecting rod pin bottom: 16 mm
- Cable length (center-to-center): 90 mm
- Stroke: 44 mm (+1 mm compared to original shaft)
- Weight (incl. Connecting rod, without pressed-on bearings): 970 grams
- Dimension needle bearing: Ø 12 / 15 x 14.2 mm (axe 12)
The needle bearing is included in the scope of delivery.
C4 racing bearings are installed on the crankshaft. C3 racing bearings are supplied for the spur gear.
The VITON oil seals are temperature-resistant up to 200°C and designed for high speeds.
&br />Revised version of the previously offered crankshaft with improved balancing ratio and thus better speed stability.
Exclusive product for the highest demands of the quality brand swiing®.
Details
| Manufacturer | swiing® ingenious parts |
| Material | Steel |
| Area of application | High End |
| Cheek type | Full cheeks |
| Crankshaft stroke | 44 mm |
| Thread type | MF10x1 (fine pitch thread) |
| Connecting rod length center-center | 90 mm |
| Total length of crankpin on clutch side | 74 mm |
| Total length crankpin ignition side | 66 mm |
| Ø crank webs | 69.9 mm |
| Ø piston pin (B) | 12 mm |
| Ø Connecting rod eye | 15 mm |
| Weight | 970 g |
| Ø Bearing seat (clutch side) | 17 mm |
| Ø Bearing seat (ignition side) | 17 mm |
| Thread length | 11 mm, 15 mm |
| Dimension needle bearing | 12 / 15 x 14.2 mm (axe 12) |
| Wide crank webs | 34 mm |
| Length 1st paragraph | 9 mm |
| Length 2nd paragraph | 14.5 mm |
| Ø 1st step (on the coupling side) | 22 mm |
| Ø 2nd shoulder (on the clutch side) | 17 mm |
| Ø 3rd step (on the clutch side) | 15 mm |
| Length of shoulder (ignition side) | 26.3 mm |
| Number of gears | 1 pcs |
Suitable for the following models
| Puch | E50 |
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