TONNKA WEAPON VALVE SPRING (OVAL) Y15ZR Y16/NVX 3.3MM 3.9MM

Tonnka Weapon Oval Valve Spring is an aftermarket racing valve spring with an oval-section wire, for Yamaha Y15ZR and Y16/NVX engines. It is offered in 3.3mm and 3.9mm wire spec options to help control valve movement at higher revs than the stock spring.

• Oval cross-section wire design instead of standard round wire
• For Yamaha Y15ZR and Y16/NVX engines
• Two spec options: 3.3mm and 3.9mm wire size
• Tonnka Weapon performance brand
• Intended to reduce valve float/bounce in higher-rev racing setups

Brand

Tonnka Weapon

Product

Oval Valve Spring

Model/SKU

Y15ZR 3.3mm, Y15ZR 3.9mm, Y16/NVX 3.9mm

Type

Racing valve spring, oval wire

Main spec

Wire thickness 3.3mm or 3.9mm

Material

Not verified

Compatibility

Yamaha Y15ZR, Yamaha Y16/NVX (confirm exact version with seller)

3.3mm is the lighter option; 3.9mm is stiffer and generally used with higher-rev/racing camshaft setups. Y16/NVX is currently listed only in 3.9mm. Match spring stiffness to your camshaft and intended rev range.

Replaces the stock valve spring inside the cylinder head; requires a valve spring compressor and correct retainer/collet reassembly, best done by an experienced mechanic. Number of springs per set not verified, confirm with seller.

Tonnka Weapon oval racing valve spring for Yamaha Y15ZR and Y16/NVX in 3.3mm and 3.9mm wire options.