Product Description
Racing Valve Spring Kit is available now from Knobtown Cycle, your Kansas City motorcycle parts specialists.
KPMI® valve springs are wound from Premium Kobe Super-Clean Chrome Silicon Wire. KPMI® valve springs are heat-treated, stress relieved, and shot peened to insure maximum performance and life. Springs are engineered for each specific application using proprietary advanced spring design simulation, and analysis software. Engineers pay special attention to cam and spring harmonics, stress, mass, and operating rpm.
Key Features
- 80 Lbs of Seat Pressure / 205 Lbs @ 0.435″ Lift (Max)
- Spring kit is designed for compatibility with the OEM integrated Seal/Base (OE# 3610212) where applicable
- Lightweight heat treated Steel Retainer and Beehive Spring reduce reciprocating mass while providing the spring forces required by high performance boosted racing applications.
Product Specifications
- Part Number: 191-21005
- Brand: Kpmi
- Weight: 0.49 lbs
Available at Knobtown Cycle
Shop online or visit our Kansas City showroom. Fast shipping available on all orders! Free Ship to Store!
Part Locations
| Location |
Available |
| Ashley (IN) |
0 |
| Elizabethtown (PA) |
0 |
| Boise (ID) |
4 |
| Midway (GA) |
0 |
| Fresno (CA) |
0 |
| Jessup (MD) |
0 |
| Midlothian (VA) |
0 |
| National Total |
4 |
Stock levels last updated: March 15, 2026 6:24 PM
Professional Installation Available
Knobtown Cycle offers professional installation services. Contact us via a service request to learn more.
Thank you for Shopping at Knobtown Cycle!
When you shop with us, you’re not just buying motorcycle parts — you’re supporting a small, family-run business rooted right here in the heartland of America. Every order helps us keep riders on the road and fuels our passion for serving the motorcycle community.
From all of us at Knobtown Cycle, thank you for choosing local and riding with us.
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