Cylinder Italkit d.47mm KTM 85 SX 18-25 / Gas Gas MC 21-25

Italkit Cylinder Ø47 mm for KTM 85 SX 2018-2025 and GasGas MC 85 2021-2025, developed with two fundamental objectives for a racing engine: maintaining performance and improving reliability.

In these engines, one of the delicate points is the rear transfer port. Italkit has redesigned its geometry to reduce the risk of failures caused by the piston ring, a problem that can end up damaging both the piston and the cylinder itself.

With this new configuration, the aim is to achieve a longer cylinder service life without compromising performance, making it an especially interesting option when it is time to renew the top end of the engine and correct one of its critical points.

The cylinder is made of aluminum-silicon alloy (Al-Si) and uses a Nikasil inner coating. This combination offers high wear resistance and good heat dissipation, something especially important in a 2-Stroke engine that usually operates at high revs and temperatures.

The kit includes a 1-ring piston with a domed crown, an ideal option in 2-Stroke engines due to its smaller contact surface and lower friction compared with a 2-ring piston. This allows for a quicker engine response, better ability to gain revs, and lower mechanical drag.

Why install this cylinder?

• Redesigned rear transfer port to reduce the risk of failures related to the piston ring.
• Greater reliability and durability of the engine top end.
• Made from aluminum-silicon for good heat dissipation.
• Nikasil coating with high wear resistance.
• Maintains a configuration designed for high performance.
• A good option for rebuilding the top end of an engine that already shows wear.

The kit includes:

• Italkit Cylinder Ø47 mm in aluminum-silicon with Nikasil coating.
• 1-ring piston with domed crown.
• Top-end gasket set.
• Piston pin bearing.

Cylinder head insert not included. Italkit offers different Ø47 mm cylinder head insert configurations to adapt the assembly to the type of piston and the level of tuning.

Available cylinder head inserts:

• CU.34.85.1: for domed-crown piston, compatible with kit CI.34.085.G.
• CU.34.85.1A: high-compression version for domed-crown piston.
• CU.34.85.2: for Italkit 4279/1 piston with 10° crown.
• CU.12.85.3: for Italkit 2984M piston with 12° crown.

Compatible models

KTM

• 85 SX 2018-2025

GASGAS

• MC 85 2021-2025