Description
cylinder Bidalot Racing Factory WR 90cc Minarelli AM6
Bidalot, the French tuning specialists, are all about pushing limits — and their latest creation, the Bidalot Racing Factory WR 90cc kit for Minarelli AM6 engines, is built for pure performance at the highest level.
The RF-WR series was developed for high speed and maximum launch performance. This kit isn’t just hype — it helped set two world speed records at the Bonneville Salt Flats (USA) in 2016.
Cylinder design Bidalot Racing Factory WR 90cc
This upgraded version features a larger 50.5mm bore and is fully matched to other high-end race components. The cylinder uses 7 transfer ports, and the split exhaust is boosted by additional porting for extreme flow.
The 3D CNC-machined, two-piece cylinder head is engineered for optimal cooling under all conditions and is made entirely from high-grade 7075 aluminum. The water jacket is black anodized with a machined Bidalot logo — clean, aggressive, and efficient. There's also a standard M10x1.00 port for a temperature sensor, or it can be closed off with the included plug.
This cylinder is designed for a 4-bolt exhaust flange (Ø28x30mm), but it also fits standard 2-bolt flanges with 50mm spacing.
Technical specifications Bidalot Racing Factory WR 90cc Minarelli AM6
- Nikasil-coated aluminum cylinder
- 7 transfer ports, bridged exhaust with boost ports
- Hypereutectic piston d=50.5mm
- 50.5x1mm piston ring
- 13x17x17.5mm small end bearing
- 44.9mm stroke with 90mm connecting rod
Bidalot Racing Factory
Bidalot has been known for 50cc tuning and racing components for several decades. The Racing Factory series (RF WR) includes Bidalot's high-end products and is the brand's most powerful series to date.
The series is available for various displacement classes. The Racing Factory products go to the absolute performance limit in all categories.
Racing Factory range
You can equip your bike completely with Bidalot Racing Factory parts and build yourself a high-end racer. Here is a list with Racing Factory parts:
- Cylinder Bidalot RF WR 50cc to 96cc
- Crankshaft Bidalot RF
- Bidalot RF internal rotor ignition
- Clutch Bidalot RF
- Exhaust Bidalot RF
- Gearbox Bidalot RF
- Spare parts Bidalot RF (gaskets, pistons, clutch plates...)
Of course, you need a bit of know-how to install the racing parts correctly and adjust them to yield maximum power.
To get the full potential out of your engine, we recommend buying a high-quality carburetor with the right diameter for the selected displacement.
Also remember to adapt the chassis to the increased engine power, e.g. with improved brakes and suspension.
How to Install a cylinder on a scooter, motorcycle or moped
The cylinder or cylinder kit is the heart of the engine on scooters, motorcycles and mopeds. It consists of a cylinder, a piston with piston ring(s), a cylinder head and gaskets needed for installation.
The service life of a cylinder depends on whether it has been fitted correctly.

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.
Aluminium cylinders
Aluminium cylinders are more powerful than cast iron cylinders, but require more regular maintenance and must be combined with different components such as a reinforced crankshaft and a larger carburetor.
How to run in an aluminium cylinder?
Aluminium cylinders should be run in for about 200 kilometers , and you should use a fully synthetic engine oil.
Note: To ensure optimum performance and reliability, it is advisable to measure the squish clearance. Just have a look at our tutorial How to adjust squish clearance.
Cylinder Bidalot Racing Factory WR 90cc Minarelli AM6 | |
---|---|
Article no. | BID11000867 |
Weight | 2,50 kg |
Series | 90-WR, Racing Factory |
Brand | Bidalot |
Product type | Cylinder kit |
Tuning level | High-end |
Displacement | 90cc |
Homologation | No |
Piston pin | 13 mm |
Cylinder material | Aluminium |
Bore | 50,5 mm |
Stroke | 44,9 mm |
Conrod length | 90 mm |
Spark plug thread | M14 long |