FAIO / EGIG PERFORMANCE Primary sprocket Z20 Poligon straight toothed for Vespa Smallframe
Straight-toothed Z20 primary gear in Poligon design for Z50 primary wheels and powerful smallframe setups.
The FAIO / EGIG PERFORMANCE Z20 primary gear is designed for Vespa Smallframe engines with a straight-toothed primary gear ratio and Z50 primary gear. The Poligon version is particularly interesting for high-torque engines, such as those built with EGIG220 or Quattrini M200. In contrast to classic cone solutions, the polygonal drive distributes the torque positively over several contact surfaces. This can improve centering and make the connection in the heavily loaded primary drive more robust, provided that all components involved match the Poligon mount.
FAIO / EGIG PERFORMANCE
Z20
Poligon
straight toothed
for primary wheel Z50
Check compatibility of the mount
What makes the product
Z20 primary gear for straight-toothed Vespa Smallframe primary gear ratios with Z50 primary gear
Poligon mount for positive torque transmission via multiple contact surfaces
Suitable for heavily built engines such as EGIG220 and Quattrini M200 setups
Gear ratio adjustment possible if primary gear and pinion match the same type of gearing and mounting
For Vespa V50, PV125, ET3 and PK Smallframe engines with matching primary drive
Poligon mount: form-fit instead of only point-loaded
The main advantage of the Poligon design lies in the type of power transmission. The polygonal contour works positively and distributes the torque over several surfaces. As a result, the connection between the pinion and the mount is subjected to less point loading than with solutions that rely heavily on a single groove, a key or a pure clamping effect. This design can be a useful component for a resilient primary drive, especially for high-displacement smallframe engines with high torque.
Z20 for primary gear Z50
This primary sprocket has 20 teeth and is intended for combination with a Z50 primary sprocket. This allows the overall gear ratio to be specifically adapted to the engine character, speed range, tire size and intended use. It is important that the gearing, number of teeth and mounting are compatible. Straight-toothed components must not be combined with helical-toothed primary parts.
Possible combinations with primary wheel Z50
Primary gear Z50: 20 teeth and 21 teeth primary pinion, depending on version as cone or poligon
Primary gear Z50: 17 teeth, 18 teeth and 19 teeth primary gear, depending on the version as cone or poligon
The variant described here is the Z20 primary sprocket in Poligon design
Use in powerful smallframe engines
Engines such as EGIG220 or Quattrini M200 place a significantly higher load on the primary drive than standard smallframe setups. This applies not only to pure engine power, but also to torque, load changes and resonance loads. A correctly tuned primary gear helps to match the transmission ratio and power transfer to the engine. The final transmission ratio should always match the exhaust, the timing, the gear connection and the desired range of use.
Installation and safety instructions
Check before installation
Only use with a suitable Poligon mount
Primary gear Z50 and straight toothing must match the pinion
Check tooth flank clearance, freedom of movement and correct fit before closing the engine
Check the wear pattern and running marks on used primary parts
After installation, carry out all securing and tightening values according to the manufacturer's specifications
Scope of delivery
Scope of delivery according to the information provided
FAIO / EGIG PERFORMANCE primary gear Z20
Straight-toothed Poligon version for primary gear Z50
Other primary parts, fuses or mounting accessories are only included if they are listed separately in the specific item scope of delivery.
Suitable vehicle models
Vespa V50, 50 N, 50 L, 50 R, 50 S, 50 Special and 50 Special Elestart with matching Smallframe engine assembly, Z50 primary gear, straight toothing and Poligon mount.
Vespa 125 Primavera and Vespa 125 Primavera ET3, if the primary drive, primary wheel Z50, gearing and Poligon mount are fitted. Particularly relevant for more powerful conversions such as EGIG220 or Quattrini M200.
Vespa PK50, PK80 and PK125 models with matching Smallframe primary gear. Before fitting, check that the Z50 primary gear, straight teeth and Poligon mount are present.
Motovespa Smallframe-related models may be relevant depending on the engine base and primary drive installed, but must be checked individually. Spanish Motovespa models may differ from Italian Vespa Smallframe models depending on the year of manufacture, market version, engine housing, primary gear ratio and auxiliary shaft mount.
Brief technical overview
| manufacturer | FAIO / EGIG PERFORMANCE |
|---|
| type | Primary gear |
|---|
| Design | Poligon |
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| Toothing | Straight toothed |
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| Number of teeth | Z20 |
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| Matching primary gear | Z50 |
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| Suitable for | Vespa V50, PV125, ET3, PK50, PK80, PK125 with matching primary gear |
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| Typical setups | EGIG220, Quattrini M200 and other powerful Vespa smallframe engines |
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| Special feature | Polygonal, positive drive for resilient torque transmission |
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| Fitting instructions | Only use with suitable Poligon mount and straight Z50 primary transmission |
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Conclusion
The FAIO / EGIG PERFORMANCE Z20 Poligon primary gear is a targeted transmission component for powerful Vespa Smallframe engines with a Z50 primary gear. The Poligon version provides positive torque transmission in the primary gear and is therefore particularly interesting for setups where power, torque and reliable power transmission have to go together.
FAQ
No. The decisive factors are a Z50 primary gear, straight teeth and a suitable Poligon mount. The model specification describes the possible vehicle basis, not automatically every engine structure.
The polygonal contour transmits the torque positively via several contact surfaces. This can make the connection in the primary drive for powerful engines more resilient than point-loaded mounts.
This primary pinion is intended for a primary gear with 50 teeth. The gearing and mount must match the primary gear ratio used.
Yes, such motors are mentioned as typical examples of use. A suitable Smallframe primary drive with Z50 primary gear, straight teeth and Poligon mount is required.
No. Cone and Poligon versions must match the respective mount. This pinion is the Poligon version and requires the matching mating contour.
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