Skunk2 B16 B16A A2 B18 B18C C1 C5 B-Series VTEC LMA Lost Motion Assembly Spring Kit

7 In Stock

7 of these are currently available in stock at our Sanford, FL location.


This is a very popular part for B-Series VTEC engines that puts preload on the center portion of the vtec rocker. Its a good idea to purchase and install these at the same time as valve springs and retainers.

Part Number Fits:
Acura B17A1
Acura B18A1, B1, C1, C5
Honda B16A2, A3
Honda B20B, Z


This is not compatible with B-Series NON-VTEC engines. No shims required.

Skunk2 is proud to introduce its Lost Motion Assembly Spring Kits for the Honda B16A/B, B17A, B18C VTEC engines or B Series engines using the VTEC cylinder head.

The Skunk2 Lost Motion Assembly is an advanced spring device that is designed to put pre-load on the center portion of the VTEC rocker when it is in the unlocked position (VTEC is disengaged). Once RPM range that VTEC engages, the Lost Motion Assembly (LMA) will compress just like the valve springs and similarly to valve springs... LMA's will over time loose their ability to function properly, become contaminated, and/ or not be able to accommodate the camshafts lift and will need to be replaced.

Skunk2's Lost Motion Assembly Springs are manufactured exclusively from chrome silicone steel using the latest 3D CAD (Computer Aided Design) modeling and FEA (Finite Element Analysis) to ensure maximum optimization. The Skunk2 Lost Motion Assembly Kit replaces the factory piston-style LMA design with an improved design commonly found in newer generation Honda engines and incorporate a hardened tip for added durability.

Skunk2 recommends replacing the LMA's when installing aftermarket camshafts as a preventive maintenance measure but requires replacement when installing Skunk2 Pro and Ultra Series camshafts or any camshafts with a lift greater than 12.5mm.


More Information
Vendor Name Code Part Number 312-05-0200
Availability New In Stock / Available
Barcode 873265006854
UPC Code 873265006854
Note Lost Motion Assembly Springs
Shipping Weight (Dimensional) 1.040000
Clearance Sale No
Availability In Stock
Part Type Lost Motion Assembly Kits
Make Honda / Acura
Model Civic Si 99-00 EK, CR-V 97-01 RD1-RD3, Integra GSR 92-93 DB2, Integra GSR 94-01 DC, Integra LS/RS/GS 90-93 DA/DB, Integra LS/RS/GS 94-01 DC, Integra Type-R 97-01 DC2
Engine B16A, B17A1, B18A, B18B, B18C1, B18C5, B20B, B20Z
Brand Skunk2
Carb Legal Unspecified
Shipping Label Free Shipping


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