Upgrade your engine’s performance with TB parts Heavy Duty Valve Springs. Designed to handle higher RPMs and increased lift from performance camshafts, these springs are the ideal solution for high-output builds. Whether you’re installing a big bore kit or racing at the limit, our HD springs help prevent valve float and ensure consistent valve timing under extreme conditions. Whether you’re building a race-ready KLX140 or just want more power with peace of mind, these heavy duty valve springs are the perfect match.

Key Features:

• Heavy-duty construction for increased 30% spring pressure
• Prevents valve float at high RPMs
• Ideal for performance cams and big bore kits
• Direct replacement – no modifications required
• Durable, long-lasting materials for reliable performance
• All Models – Designed specifically for the KLX140 engine

Run harder, rev higher, and stay in control with TB parts HD Valve Springs.