Tuning Cylinder Kit ZT90N Stage 3 (90cc) - for Simson S51, S53, KR51/2 Schwalbe

Tuning Cylinder Kit ZT90N Stage 3

The Stage 3 cylinder represents an absolute new development.

To meet the need for ever-increasing performance, while maintaining high mileage and thermal stability, we have decided to develop a cylinder with a larger intake flange. This allows us to achieve a significant increase in performance without compromising durability through measures such as extreme cross-sections in the cylinder or too high compressions.
The result of a long development time and an investment in a completely new casting mold is a performance increase of up to 2HP and 1.5NM compared to the ZT90N GEN2 Stage 2.
The cylinder has a 27mm inlet and can therefore be operated with a VM 24 or VM 26 carburetor. The timing and channel cross-sections have also been moderately adjusted.
The intake flange has been precisely adapted to the VM carburetors, so it is not immediately apparent to the layman that something has been modified.
With adapter plates or membrane conversions, this is usually recognizable at first glance.

Features:
- Outlet Ø 27mm, Inlet Ø 27mm (not suitable for BVF carburetors!)
- Internally centered cylinder head ---> easy assembly, improved sealing
- Maximum heat dissipation through finely blasted surface and coated aluminum sleeve
- Long durability (up to 10TKM per piston, 4 oversizes available)
- Unbeatable performance values in the 86cc range
- Vmax: 110Km/h +
- Designed for 44mm stroke
- Piston diameter 50mm

Performance values:
- 17 HP with ZT-Reso 2019 (24mm carburetor)
- 19.5 HP with ZT-Reso Special (24mm carburetor)

Scope of delivery:
- ZT90N GEN3 Stage 2 cylinder (with 54mm cylinder sleeve diameter)
- ZT90N cylinder head internally centered
- ZT90N piston GEN3 (1-ring, 49mm shirt length, 50mm diameter)
- Carburetor flange gasket
- Cylinder base gasket 0.3mm
- Cylinder base gasket 0.5mm
- Carburetor flange studs
- 2 hardened thrust washers