Valve spring Set Cardinals Racing Yamaha YI-5 Motor, Oval 13.2 x 34.5L, 52 kg at 25 mm bis RPM 14,800

The Cardinals Racing OS2 Valve Spring Set was developed for high-performance Yamaha YI-5 engines and ensures significantly more stable valve control at high RPMs. The reinforced construction reduces the risk of valve chatter, allowing the engine to operate reliably even under extreme conditions.

The valve springs are made of highly durable material and are designed for high RPMs and high-performance engine setups. The optimized spring geometry ensures consistent valve movement—ideal for racing camshafts, tuned cylinder heads, and high-performance setups.

Technical Specifications

• Manufacturer: Cardinals Racing
• Model: OS2
• Product: Valve Spring Set
• Compression force: 52 kg at 25 mm
• Max. valve lift: up to 11.3 mm
• Max. RPM: up to approx. 14,800
• Spring pressure: 120 psi at 25 mm
• Application: Valve train / Racing setup

Compatible with:

• Yamaha YI-5 engine

Included

• 4 × Cardinals Racing valve springs

Categorized in:

• Parts > Cylinder > Spare parts Cylinder head and Camshaft
• Parts > Cylinder > Camshafts & Parts