Tuning Kit 85cc cylinder + crankshaft Top Performances AM6

Top Performances 85cc Tuning Kit AM6

With its 85cc cast iron cylinder and crankshaft kit for Minarelli AM6, Top Performances offers a combination of performance and durability at an attractive price.

The kit includes a long-stroke crankshaft (44 mm stroke) and a big bore cylinder kit (49.5 mm bore) with a single-ring piston, plus a cylinder head with a high-compression modular combustion chamber. Together, they provide a displacement of 85cc with an output of approximately 17 - 19 hp.

The longer stroke improves the bore-to-stroke ratio, giving the engine a much smoother power curve than tuning cylinders that must use a standard stroke. The result is strong torque and more pulling power throughout the entire rpm range, without sacrificing peak power. At the same time, this cylinder remains highly durable and is therefore also suitable for everyday use. This is further supported by the two-piece cylinder head, which ensures maximum cooling.

We recommend pairing it with at least a 21 mm carburetor and a racing exhaust (e.g. Yasuni R3, Pro Race, SCR Racing Line, etc.).

Technical specifications 85cc cylinder

• Cast iron cylinder with directly cooled combustion chamber
• Exhaust timing: 191°
• Intake timing: 132°
• Squish clearance: 0.9 +/- 0.1 mm
• Compression ratio: 8:1
• Recommended ignition timing: 17° (1 mm before TDC)
• Recommended NGK BR10EG spark plug

Contents Top Performances engine kit

• Cylinder kit (spare part number: 9921760)
• Piston
• Small end bearing
• Combustion chamber insert
• Water jacket
• Gasket set
• Reducer sleeve 28/25 mm
• 44 mm stroke long-stroke crankshaft

Note: Supplied without oil seals and crankshaft bearings. Since one of the crankshaft journals has a diameter of 20 mm, two different bearing sizes are required: 6303 and 6204 (1x AM6 bearing and 1x Derbi bearing).