Cylinder overhaul kit Vertex (Race 12° Piston+Smeriglio gaskets set) for GasGas MC 85 21-24 Top End

All cylinder overhaul kits are sold complete with everything needed for installation: Vertex piston dedicated + Smeriglio gaskets set and piston pin for 2 stroke bikes or cam chain for 4 stroke bikes

THE PERFECT COMBINATION OF TWO ESSENTIAL ENGINE COMPONENTS

The guarantee of having in a single kit two products that work perfectly together for an excellent result.

Smeriglio gasket contains head, base and all the other gaskets needed for piston or ring replacement

The type of piston selected is specified in the product title, below are listed the different types of pistons produced by Vertex with a brief description:

Replica: cast piston in original OE form
Race: Cast piston developed with Vertex know-how
Pro: Forged piston
Replica BB: Cast piston in original OE form for big bore cylinder
Pro Replica: Forged piston in original OE form
Pro-BB: Forged piston in original OE form for big bore cylinder
Pro-Race: Forged piston developed with Vertex know-how
Pro-HC: Forged piston developed with Vertex know-how and high compression
GP Racers Choice: will fit the Top Racers high expectation. Main features: machined by F1 T-Bridge forged blanks, max compression ratio, nitride ring set, DLC coated pin, anti-rotation external hook clips, racing shape profile, moly coated.

General features of vertex pistons:

Vertex pistons: are manufactured using exotic aluminium alloys called Low-Ex (low expansion) Silicon charged with 12%, 18% or 21% depending on the application. Vertex pistons are manufactured using either a gravity cast or hydraulic forging process to make the blank parts and then the material structure is refi ned using a hi-tech Heat Treatment completed in an automatic HT implant with solubilization by quench in hot water. This heat treating process is cutting edge technology for this type of aluminium alloys. The machining process is completed using the latest CNC machines and software as well as the usage of diamond tools. By using this high tech tooling, specific surface finishes can be achieved depending on the final application of the finished piston. Every Vertex piston passes through a rigorous manual and automatic quality control process to insure only the highest quality level. Vertex pistons are coated with a special Molybdenum Bisulphite black coating to aid during piston break in and reducing friction during the work inside the cylinder. Recently, following the latest developments used in Formula One engines, Vertex has introduced a new, all over, Phosphate Coating which has a slight hardness increase combined with a light surface porosity that exhibits superior adhesion qualities of the Molybdenum Coating, extending the coating durability for twice as long.

Rings: The latest generation Vertex rings for 2 and 4 Stroke applications are made in a steel material with nitriding coating, instead of chrome, to extend their durability. They are produced by the Japanese facilities already supplying the OE manufactures and are interchangeable with the OE rings.

Circlips: Vertex circlips are produced in Europe by the best OE automotive suppliers. They are made in steel material following ISO standards.

Pins: Vertex pins are produced in Europe by the best OE automotive suppliers. They are generally made in 16NiCr4 steel material utilizing a hydraulic forging process and consequent hard case treatment followed by the CNC machining, grinding and lapping processes. The generic strict tolerance applied to the external diameter is 0,003 mm.