Beehive Spring Kit, Rocker Shim Conv. System, 0.625” Lift, HD®, M8™ (& CVO’s*) 2017-2024

*2023-2024 CVO’s check valve lift to determine compatibility with KPMI® spring kits

• Innovative design adds a Ø9.5mm hardened steel shim between the valve tip and rocker arm
• The Ø9.5mm shim increases allowable rocker wipe area for maximum valve lift
• Up to 0.625” valve lift compatibility
• Offered with either Titanium or H.T. Steel retainers
• Includes Heavy Duty 9° H.T. Steel Keepers, Ø9.5mm Steel Shim, Red Viton® Seals and a HT Steel Basewasher

The KPMI® Rocker Shim Conversion Spring Kit for the Milwaukee-8 utilizes the proven KPMI 0.625" beehive spring and a lightweight retainer that houses a standard Ø9.5mm hardened steel shim. The rocker arm rides directly on the shim surface and the 9.5mm diameter significantly increases the allowable rocker wipe area. This increase in wipe area provides the ability to utilize larger lift cams, that previously were unable to run on a 6mm valve stem. Additionally, the rocker shim thickness can be varied to adjust effective stem protrusion.

When larger camshafts are used, and valvetrain acceleration values increase, KPMI® strongly recommends running titanium valves for maximum performance

IMPORTANT NOTE:
Modification Necessary:
To maximize shim contact in the retainer, KPMI recommends “tipping” (shortening the valve tip). See KPMI® installation instructions for more info.
Stem Protrusion:
There is anticipated to be a rough 0.100” increase in effective stem protrusion with the use of the shim.