Description
Crankshaft incl. cylinder base spacer stroke 45mm / connecting rod 90mm Stage6 HPC Minarelli AM6.
The crankshaft kit with spacer is ideal if you want to increase the displacement of a 85cc or 86cc cylinder by about 2cc to increase torque. Simply install the crankshaft with spacer instead of a 44mm stroke crankshaft.
The pack contains:
- Stage6 HPC crankshaft with 45mm stroke / 90mm Minarelli AM6 connecting rod
- Cylinder spacer 5mm Stage6 CNC Orange Minarelli AM6
- Crankshaft Bearings + Oil Seals Stage6 6204 C3 polymer cage Minarelli AM6 (journal=20mm)
The crank webs of this top quality full-circle crankshaft are slightly lighter, and together with the light alloy balance weights the balancing of this crankshaft is excellent. The connecting rod, specially designed for this crankshaft, offers significantly higher strength since it is 14 mm wide (instead of 12 mm); this reduces bearing wear while increasing stability even at extremely high speeds.
This HPC crankshaft was built for tuned engines, and as a matter of course the Streetrace & Big Racing 88cc kits are not the pnly cylinders this crankshaft can be used with. You can combine it with all racing and high-end racing cylinders that have to be run with a 45mm stroke crankshaft. Perfect combination for example with Top Performances 85cc / 86cc kits.
The Stage6 spacer is made of 5mm thick aluminum and then CNC machined. The classic orange Stage6 anodizing adds a cool colour accent.
Also supplied are two crankshaft bearings with ETN9 polymer cage. The advantages with the polymer plastic version compared to metal cages are increased elasticity and reduced friction. The oil seals are of excellent quality and ensure reliable sealing.
Note:
- Most Minarelli AM6 cylinders come standard with an 85mm connecting rod. You'll have to compensate the height difference with a 5mm spacer (except on Stage6 cylinders).
- The crankcase must be milled open a little; calculate accurately beforehand, lay out the parts and paint the correct dimensions onto the case to make the passage of the connecting rod clearly visible.
- Journals: 20mm
Technical data:
- Connecting rod: 90mm (original 85mm)
- Stroke: 45mm (original 39mm)
- Piston pin: original (12mm)
- Small end bearing: 12x17x15mm
- Weight: 1320g
- Maximum speed: 16.000rpm
- Use: Racing / High End Racing
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 w/ cylinder spacer 45mm stroke / 90mm conrod Stage6 HPC Minarelli AM6 | |
|---|---|
| Article no. | S6-8018810/PACK01 |
| Weight | 1,72 kg |
| Series | HPC |
| Brand | Stage6 |
| Product type | Crankshaft |
| Tuning level | High-end |
| Piston pin | 12 mm |
| Needle bearing | 12x17x15mm |
| Stroke | 45 mm |
| Conrod length | 90 mm |
