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HPSP VALVE SPRING RACING Y15ZR 4PCS (SUMITOMO JAPAN MATERIAL)

RM58

HPSP Racing valve spring set is a 4-piece performance valve spring upgrade for the Yamaha Y15ZR, made from Sumitomo Japan spring steel. Built for riders running modified cylinder heads or high-lift camshafts who need stronger valve spring pressure to prevent valve float at higher RPM.

Option

In stock · Estimated delivery: 3–7 business days (West Malaysia)

Product Details

Overview

Key Features

4 pieces per set (full valve spring kit)
Sumitomo Japan material, HPSP states 100% original
Two spec options for different setups
Supports higher-RPM, modified cylinder head builds

Specifications

Brand: HPSP Racing
Product: Valve Spring Racing
Application: Yamaha Y15ZR
Quantity: 4 pieces per set
Material: Sumitomo Japan spring steel
Spec option 1: Approx 3.0mm, 57-63mm range
Spec option 2: Approx 3.2mm, 65-68mm range (jet 4-6mm)

Variants & Setup

Two spec options are available (3.0mm and 3.2mm ranges) — choose according to your cylinder head, camshaft and jetting setup. If unsure which spec matches your current build, check with your mechanic or the seller before ordering, as the wrong spring spec can cause valve float or seating issues.

Installation & Package

Requires cylinder head removal and a valve spring compressor to install; recommended for an experienced mechanic or performance workshop, not a beginner DIY job. Package includes 4 valve springs as described.

Summary

A Sumitomo Japan-material 4-piece racing valve spring set for modified Yamaha Y15ZR engines.

Important Notes

This is a performance part intended for modified engines; stock/standard setups do not normally need a valve spring upgrade. Incorrect spec selection or improper installation can affect engine reliability — always fit with a qualified mechanic.