Description
HPC crankshaft for original and tuning setups from Stage6
Crankshaft Stage6 HPC stroke 55mm / connecting rod 110mm for Piaggio / Gilera 125 - 180 cc 2-stroke, the perfect match for original and tuning cylinders, no matter if with only moderately or considerably enhanced performance. The Stage6 crankshaft meets any ambitious scooter owner's demands, especially in cases of engines with significantly increased performance.
The high-quality full-circle crankshaft has been lightened internally on the shoulder side; in combination with the copper counterbalance weights on the other side the crankshaft is perfectly balanced. The result: the engine runs smoothly over a wide range of applications and for all usages, whether for normal road us or for circuit and sprint racing. The crankshaft is equipped with a high-quality forged connecting rod with silver-forging finish to round off the high-quality design.
This version of the crankshaft has a 110mm connecting rod with a crank stroke of 55mm. By changing the stroke from 52 to 55mm, the engine displacement is increased from 175cc to 185cc, resulting in more torque and peak power over the entire rpm range. You will need a cylinder head spacer to adjust bore length and port timings. They are included to allow for easy plug & play installation.
The connecting rod is 5 mm longer than the original, the volume in the engine increases, thereby reducing pre-compression and providing more fresh gas for the transfer ports. If you follow this approach when tuning your engine, this crankshaft is a really good choice! The matching 5mm spacer is also included.
The crankshaft is also available with 52mm stroke / 105mm connecting rod and with 55mm stroke / 105mm connecting rod.
We recommend installing new crankshaft bearings and oil seals (part number S6-8034101).
Technical data:
- Connecting rod: 110mm
- Stroke: 55mm (original)
- Piston pin: 16mm
- Small end bearing 16x20x20mm
- For LC models: Cylinder head spacer 1.0 mm
- For AC models: Cylinder head spacer 1.5 mm
- Compensation conrod length: Cylinder head spacer 5 mm
Stage6 HPC
The HPC crankshafts from Stage6 are the brand's racing crankshafts. There are versions with standard stroke and with long stroke, the HPC shafts are available for both 50cc motorcycles and scooters.
HPC crankshaft performance
The HPC crankshaft (HPC for High Primary Compression) is very robust and also suitable for high RPMs, e.g. in combination with the Stage6 Big Racing cylinder.
- Made entirely of metal (no plastic inserts)
- Precise balancing
- Forged connecting rod
- Suitable for sport to racing setups
Supplied without crankshaft bearings. Please also remember to get the necessary tools, e.g. a flywheel puller.
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: High End 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.
High End Racing products are exclusively designed for racing and should only be handled by tuning pros with the appropriate technical know-how. High-end racing parts often require modifications or machining of certain elements to accommodate the often larger components (larger crank webs, larger intake, etc.). Whether you stick with 50cc or increase the displacement, high-end racing parts offer much higher performance than the original parts and are the most powerful tuning parts.
Note: To ensure the reliability of the engine, it is important that the parts are compatible and that you do regular maintenance on your two-wheeler.
| Crankshaft Stage6 HPC stroke 55mm / conrod 110mm Piaggio / Gilera 125 - 180 2-stroke | |
|---|---|
| Article no. | S6-8014103 |
| EAN | 4051272016158 |
| Weight | 2,67 kg |
| Series | HPC |
| Brand | Stage6 |
| Product type | Crankshaft |
| Tuning level | High-end |
| Piston pin | 16 mm |
| Needle bearing | 16x20x20mm |
| Stroke | 55 mm |
| Conrod length | 110 mm |
Spare Parts
- Stage6
Cylinder Head Spacer 1mm Stage6 Piaggio / Gilera 125 - 180 LC 2-stroke13,50 €In stockRRP15,00 €-10% Discount - Stage6
Cylinder Head Spacer 1,5mm Stage6 Piaggio / Gilera 125 - 180 AC 2-stroke10,50 €In stockRRP11,50 €-9% Discount - Stage6
Cylinder Base Spacer 5mm Stage6 Piaggio / Gilera 125 - 180 2-stroke13,50 €In stockRRP15,00 €-10% Discount