KPMI Valve Spring Kit - .625 Lift H.t. Steel Retainer — Harley-Davidson Road King, Tri Glide Ultra Classic, Electra Glide Ultra Limited (2017-2020)

KPMI valve spring kit with .625 in lift capacity, wound from premium Kobe Super-Clean chrome silicon wire and heat-treated for durability. Each spring is stress-relieved and shot-peened to handle high-RPM loads while maintaining consistent valve timing across the engine's operating range.

Features

• Premium Kobe Super-Clean chrome silicon wire
• Heat-treated and stress-relieved construction
• Shot-peened for fatigue resistance
• .625 in lift capacity
• Engineered for specific cam and RPM profiles

Specifications

• Brand: KPMI
• Manufacturer Part #: 20-21850
• Length: 6 in
• Width: 2.25 in
• Height: 1.75 in
• Weight: 8 lbs

Frequently Asked Questions

What engine does this kit fit?

This part number is application-specific. Verify your engine displacement and year with KPMI before ordering to ensure correct spring rate and lift.

Do I need a spring compressor to install?

Yes — professional valve spring installation requires a compressor tool and knowledge of proper seat pressure. Use a qualified technician if unfamiliar with cylinder head work.

Can I mix these with my existing springs?

No — all springs in a set should be replaced together to maintain consistent valve timing and seat pressure across all cylinders.