KPMI Valve Stem Seal - 4/PK HD Evolution '1987-1999 — Harley-Davidson Sportster 883, Softail Heritage Classic, Sportster 883 Hugger (1984-2004)

KPMI Red Viton® valve stem seals for Harley Evolution engines, sold in a 4-pack for both intake and exhaust applications. These high-temperature seals prevent oil from entering the combustion chamber and are engineered to handle maximum valve lift without leaking.

Features

• Viton® construction resists high temperatures and petroleum products
• Prevents oil blow-by into combustion chamber
• Supports maximum valve lift
• 4-pack quantity
• Sized for Evolution engine specifications

Specifications

• Brand: KPMI
• Manufacturer Part #: 71010-4
• Quantity: 4 per pack
• Length: 1.3 in
• Width: 3.65 in
• Height: 0.7 in
• Weight: 0.02 lbs

Fitment

Fits Harley-Davidson Evolution engines, 1987-1999 model years.

Frequently Asked Questions

How many seals are in a pack?

Four seals — enough for one complete valve set on a single-cylinder or one front/rear pair on a twin.

Will these fit my Twin Cam engine?

No — these are designed for Evolution engines only (1987-1999). Twin Cam owners need a different part number.

What makes Viton® better than rubber seals?

Viton® withstands higher temperatures and resists oil and combustion by-products better than standard rubber, preventing blow-by into the cylinder.

Do I need special tools to install these?

Valve stem seals require removal of the rocker covers and valve springs — a professional mechanic or experienced builder should handle installation.