Description
racing Crankshaft Schmitt Drehfreund for Simson
Reinforced tuning crankshaft Schmitt "Drehfreund" for Simson S51, S70, S83 with M500, M700 engine case. Schmitt defines the range of this crankshaft for engines from 50 - 75cc displacement.
Features crankshaft Drehfreund
The precisely manufactured crankshaft made in Germany has 44mm stroke with 85mm connecting rod. The lightweight, polished connecting rod (70g) is supplied with a high-quality, silver-plated small end bearing. The upper and lower needle bearings are optimally lubricated by several extra-large holes in the connecting rod.
The materials are of very high quality and the production is precise. All critical points have been sufficiently reinforced to ensure smooth running and optimum rigidity even at high engine speeds. Concentricity deviation and bearing seat fit comply with the latest measurement and manufacturing standards. The pre-compression is optimized and ensures a wide torque band.
And another tuning treat: on the clutch side, the crankshaft stub has been extended to allow the installation of an optional 3rd crankshaft bearing.
The crankshaft runs noticeably smoother than original crankshafts, even at high engine speeds. The free-turning Drehfreund crankshaft from Schmitt is suitable for both original setups and powerful, high-revving tuning engines.
Specifications Simson crankshaft Drehfreund:
- Crankshaft made from 14NiCrMo13 steel
- Lighter than the original crankshaft
- Optimized pre-compression for a wide torque band, narrower webs compared to the steam hammer version STT42038
- Balance factor: 65%
- Stroke: 44mm
- Connecting rod length: 85mm
- Larger, silver-plated small end bearing 12x17x15mm for 12mm piston pins
- High-strength, lightweight forged connecting rod with larger eye and extra-large lubrication holes
- Extended crankshaft stub on the clutch side for an optional 3rd crankshaft bearing
- Bottom-guided connecting rod with reinforced interference fit and larger connecting rod eye
- RPM-resistant up to 15,000 rpm
- Suitable from 50ccm to 75ccm displacement
- Suitable for S51, S70, S83 with M500, M700 crankcase
How to change a crankshaft?
The crankshaft is one of the main components of the engine and is responsible for the smooth operation of motorcycle, scooter and moped, whether with two-stroke or four-stroke engine. The longevity of the engine depends not only on the proper condition of the crankshaft, but also on the fact that it is properly mounted.
For a correct installation of the crankshaft, we recommend our tutorial: Crankshaft disassembly and assembly.
How can I tell if my crankshaft is Damaged?
A broken crankshaft causes metallic noises, unusual vibrations, leaking oil seals and drastically reduces the performance of the two-wheeler. In any case, the vehicle must be stopped immediately to prevent the damage from getting worse.
Please note that whenever the crankshaft is changed and serviced, you'll have to install new crankshaft bearings.
Tuning Level: Racing
We categorize our products into different performance levels Original, Sport, Racing and High End , so that our customers can choose the right parts for their setup. It is really important to combine parts that belong to the same tuning level, this is especially true for cylinders, crankshafts and exhausts.
Racing products are designed for a more extreme uses and are developed primarily for racing. Whether you stay at 50cc or increase the displacement, the corresponding Racing parts produce much higher performance than the original parts in order to achieve maximum power.
| Crankshaft Schmitt Drehfreund 44mm stroke / 85mm conrod 50-75cc Simson S51 / S70 / S83 / M500 / M700 | |
|---|---|
| Article no. | STT49351 |
| EAN | 4057233986874 |
| Weight | 1,56 kg |
| Brand | Schmitt |
| Product type | Crankshaft |
| Tuning level | Racing |
| Piston pin | 12 mm |
| Needle bearing | 12x17x15mm |
| Stroke | 44 mm |
| Conrod length | 85 mm |