HPSP VALVE SPRING LC135 4PCS (SUMITOMO JAPAN MATERIAL)

HPSP Racing valve spring set is a 4-piece performance valve spring upgrade for the Yamaha LC135, 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.

• 4 pieces per set (full valve spring kit)
• Sumitomo Japan material
• 3 spec options for different setups
• Supports higher-RPM, modified cylinder head builds

Brand

HPSP Racing

Product

Valve Spring Racing

Application

Yamaha LC135

Quantity

4 pieces per set

Material

Sumitomo Japan spring steel

Spec option 1

Approx 2.8mm, 57-62mm range

Spec option 2

Approx 2.9mm, 63-65mm range

Spec option 3

Approx 3.0mm, 65-68mm range

Three spec options are available (2.8mm, 2.9mm and 3.0mm ranges) — choose according to your cylinder head, camshaft and valve 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.

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.

A Sumitomo Japan-material 4-piece racing valve spring set for modified Yamaha LC135 engines.