Product Overview
Skunk2 Lost Motion Assembly LMA Kit – Honda B-Series VTEC
Upgrade the valvetrain of your Honda B-Series VTEC engine with the Skunk2 Lost Motion Assembly (LMA) Kit, part number 312-05-0200.
Designed as a direct replacement for the factory lost motion assembly, the Skunk2 High-Lift LMA is engineered specifically to provide additional travel for engines running high-lift VTEC camshafts.
The lost motion assembly plays an important role within the Honda VTEC rocker assembly. It helps keep the centre VTEC rocker correctly positioned when VTEC is disengaged and provides additional spring force to control the extra weight of the rocker assembly when VTEC engages.
According to Skunk2, factory LMAs can bind when used with high-lift camshafts, potentially contributing to wear on the VTEC lobe. The Skunk2 spring-style LMA uses an extended-travel design intended to accommodate high-lift camshaft applications.
Why Upgrade to Skunk2 Lost Motion Assemblies?
The factory Honda lost motion assembly uses a design that can become less effective with age, contamination, wear or when paired with aftermarket high-lift camshafts.
The Skunk2 High-Lift Lost Motion Assembly replaces the OE unit with a spring-style design that offers increased travel. This makes it particularly suitable for performance Honda B-Series VTEC engines running upgraded camshafts.
Skunk2 recommends replacing the LMAs as a preventative measure when installing aftermarket camshafts.
Skunk2 312-05-0200 Key Features
- Skunk2 High-Lift Lost Motion Assembly Kit
- Part number: 312-05-0200
- Designed for Honda B-Series and H-Series VTEC cylinder heads
- Direct replacement for the original equipment LMA
- Spring-style design with extended travel
- Designed to accommodate high-lift VTEC camshafts
- Recommended for high-lift VTEC camshaft applications
- Hardened tips for improved longevity and durability
- Helps maintain correct centre VTEC rocker positioning
- Provides additional spring force when the VTEC rocker assembly is engaged
- Suitable for performance and modified Honda VTEC engines
Product Specifications
| Specification | Details |
|---|---|
| Brand | Skunk2 |
| Product | Lost Motion Assembly Spring Kit |
| Part Number | 312-05-0200 |
| Product Type | High-Lift Lost Motion Assembly |
| Engine Family | Honda B-Series / H-Series VTEC |
| Application | VTEC Cylinder Heads |
| Design | Spring Style / Extended Travel |
| Replacement Type | Direct OE Replacement |
| Tip Design | Hardened Tips |
| High-Lift Camshaft Compatible | Yes |
| SKU | 312-05-0200 |
Product specifications are based on the manufacturer’s published information for Skunk2 part number 312-05-0200.
Honda B-Series VTEC Compatibility
The Skunk2 312-05-0200 Lost Motion Assembly Kit is designed for Honda B-Series VTEC cylinder heads. Distributor fitment information identifies applications including B16A, B17A and B18C DOHC VTEC engines, including Type R and GS-R applications.
This product is intended for VTEC applications. It should not be assumed to fit non-VTEC B-Series cylinder heads. Always confirm your exact engine code and cylinder-head specification before ordering.
How Does a Lost Motion Assembly Work?
The lost motion assembly operates within the VTEC rocker mechanism. When VTEC is not engaged, the LMA helps maintain the centre portion of the VTEC rocker in its correct position.
When VTEC engages, the rocker assembly changes operating position and the LMA provides spring force to help control the additional movement and weight of the rocker assembly.
This makes the LMA an important component of the Honda VTEC valvetrain, particularly when the engine is upgraded with more aggressive or higher-lift camshafts.
Designed for High-Lift Camshafts
One of the main reasons to upgrade to the Skunk2 LMA is when installing aftermarket high-lift camshafts.
Skunk2 explains that factory LMAs can bind when used with high-lift camshaft profiles. The Skunk2 spring-style design provides additional travel to better accommodate high-lift VTEC camshafts.
This makes the 312-05-0200 kit particularly suitable for performance Honda engines using aftermarket camshafts from Skunk2 and other performance manufacturers.
Hardened Tips for Durability
The Skunk2 Lost Motion Assembly uses hardened tips designed to provide increased longevity and durability in the demanding environment of a high-performance VTEC valvetrain.
This is particularly important for engines that regularly operate at high RPM or use upgraded performance camshafts.
When Should You Replace Your Honda LMA?
Replacing the lost motion assemblies can be worthwhile when rebuilding or upgrading a Honda B-Series VTEC cylinder head.
Skunk2 specifically recommends replacing the LMAs as a preventative measure when installing aftermarket camshafts.
Consider replacing the LMAs when:
- Installing aftermarket high-lift camshafts
- Rebuilding a B-Series VTEC cylinder head
- Refreshing an older Honda VTEC valvetrain
- Experiencing suspected LMA wear or valvetrain noise
- Building a high-RPM naturally aspirated Honda engine
- Upgrading the VTEC rocker assembly
Ideal for Honda Performance Builds
The Skunk2 312-05-0200 Lost Motion Assembly Kit is a popular choice for enthusiasts building performance-focused Honda B-Series VTEC engines.
It is particularly suited to engines using:
- High-lift aftermarket camshafts
- Performance valve springs
- Upgraded titanium retainers
- Performance cam gears
- High-RPM naturally aspirated builds
- Track-focused Honda engines
- Fast-road performance builds
Installation
Installation should be carried out by a qualified engine builder or experienced Honda technician familiar with B-Series VTEC cylinder heads.
When installing aftermarket camshafts and valvetrain components, the complete valve train should be checked for correct clearance, travel and compatibility. Always follow the relevant manufacturer’s installation instructions.
If the engine is being rebuilt or fitted with high-lift cams, it is recommended to inspect the associated VTEC rocker components and other valvetrain parts at the same time.
Skunk2 312-05-0200 vs Factory LMA
| Feature | Skunk2 312-05-0200 | Factory LMA |
|---|---|---|
| Replacement Type | Direct OE replacement | Original equipment |
| Design | Spring style | Factory design |
| Extended Travel | Yes | Standard factory design |
| High-Lift Camshaft Use | Designed for high-lift applications | May bind with some high-lift profiles |
| Tip | Hardened | Factory specification |
The extended-travel design and high-lift application information above are based on Skunk2’s published product specifications.
Buy Skunk2 312-05-0200 in the UK
Order the Skunk2 Lost Motion Assembly Honda B-Series VTEC 312-05-0200 from Performance Car Parts.
We supply performance engine components and aftermarket parts for Honda and other performance vehicles, with UK-wide delivery available.
If you’re upgrading a Honda B-Series VTEC engine with high-lift camshafts, the Skunk2 LMA kit is an important valvetrain upgrade designed to provide additional travel and improved durability.
Upgrade your Honda VTEC valvetrain with Skunk2 312-05-0200 Lost Motion Assemblies.
Product Information
- Brand: Skunk2
- Series: High-Lift Lost Motion Assembly
- Product: Lost Motion Assembly Spring Kit
- SKU: 312-05-0200
- Application: Honda B-Series / H-Series VTEC
- Type: Performance Valvetrain Component
- UK Shipping: Available throughout the UK
