Clutch Talk

A complete overview on all things clutch, when to replace and what to replace with. Some idea of prices and a few videos.

Jul 25, 2025

A wet clutch in a motorcycle operates by using a stack of alternating friction and steel plates that are bathed in engine oil, which helps cool the components and reduce wear. When the clutch lever is released, springs compress the clutch pack, causing the friction plates (connected to the transmission) and steel plates (connected to the engine) to interlock and transfer power from the engine to the gearbox.

Pulling the clutch lever relieves pressure, allowing the plates to separate and disengage power, enabling smooth gear changes. Wet clutches are common in modern motorcycles due to their durability and smoother engagement. Replacing a wet clutch is moderately challenging but doable with basic mechanical skills and the right tools.

First, signs that your clutch may need replacement include difficulty shifting gears, clutch slippage (engine revs increase without corresponding acceleration), a stiff clutch lever, or strange noises during gear changes.

To inspect, drain the engine oil and remove the clutch cover. Check the friction plates for wear, glazing, or burning, and the steel plates for warping or discoloration. Use a micrometer to measure plate thickness and compare it to your bike’s service manual specs. If the plates are worn or warped, replace them. Always soak new friction plates in clean engine oil overnight before installation to ensure proper lubrication.

When installing, the plates must be stacked in a specific alternating order: typically starting with a friction plate, followed by a steel plate, and repeating until the clutch pack is complete. Some bikes may include a thicker friction plate or a judder spring at the innermost position, so refer to your manual for exact order.

Reassemble the clutch with new springs if needed, torque bolts to spec in a criss-cross pattern, and replace the clutch cover with a new gasket. Refill the engine with fresh oil and adjust the clutch cable or hydraulic system for proper free play. After installation, test the clutch engagement and go for a gentle ride to ensure smooth operation.

Regular oil changes and using motorcycle-specific oil (JASO MA/MA2 rated) will help extend clutch life and maintain performance.

Upgrading the clutch on a sport bike is one of the most impactful modifications for riders seeking better performance, especially in street racing or aggressive riding scenarios. Let’s dive deep into the world of performance clutches, exploring their types, functionality, benefits, and how they compare to OEM setups.

🏍️ Types of Clutches

Performance clutches come in various stages and configurations, each tailored to specific riding styles and power demands:

🔹 Stage 1 – Street Performance

Material: Organic or mild Kevlar
Features: Slightly increased clamping force, smoother engagement
Use Case: Ideal for daily riding with occasional spirited runs
Pros: Retains OEM feel, longer life, minimal wear on components

🔹 Stage 2 – Sport/Track Ready

Material: Segmented Kevlar or dual friction (Kevlar + organic)
Features: Higher heat resistance, better torque handling
Use Case: Weekend track days, aggressive street riding
Pros: Improved launch control, fade-free performance

🔹 Stage 3 – Race Spec

Material: Full ceramic or puck-style discs
Features: Maximum torque capacity, aggressive engagement
Use Case: Drag racing, high-horsepower builds
Pros: Instant power transfer, minimal slippage
Cons: Harsh engagement, not ideal for stop-and-go traffic

🔹 Auto Clutch Systems (e.g., Rekluse RadiusX)

Function: Automatically engages/disengages based on RPM
Use Case: Versatile for both street and off-road
Pros: No stalling, reduced fatigue, smoother launches

⚙️ How Performance Clutches Work

Performance clutches enhance the friction interface between the engine and transmission. They use upgraded materials and stronger springs to:

Increase clamping force: Prevent slippage under high torque
Improve heat dissipation: Reduce fade during aggressive use
Enhance engagement feel: Provide quicker, more predictable launches
Some kits include extra friction plates, billet pressure plates, or lock-up mechanisms to handle extreme loads.

🛠️ Popular Brands: Brock’s Performance & MPS Racing

🔧 Brock’s Performance

Offers Clutch Cushion Kits, Heavy Duty Spring Kits, and Billet Clutch Mods

Benefits:
Smoother launches
Increased static clutch pressure
Extended clutch life
Street-friendly feel
Price Range: ~$259–$1,679 CAD depending on kit and bike model

🔧 MPS Racing

Specializes in Hayabusa clutch mods and drag racing setups

Features:
Billet aluminum mod rings
Welded torque limiters
Heavy-duty springs

Benefits:
Eliminates clutch chatter
Improves 60-ft times
Ideal for street/strip hybrids
Price Range: ~$45–$319 USD for mod kits and components

🏁 Best Clutch for Street Racing

For riders upgrading from OEM for street racing, consider:
EBC Street Racer SRK Kits: Aramid fiber friction plates + heavy-duty springs
Action Clutch Stage 4 or 5: Ceramic puck-style discs for aggressive engagement
Rekluse TorqDrive: Offers smoother lever feel with increased torque capacity

✅ Recommended Features:

High heat resistance
Quick engagement
Fade-free performance
Compatibility with stock basket or billet upgrade

💰 Approximate Price Range:

Clutch Type Price (CAD)
Stage 1 Organic $180–$250
Stage 2 Kevlar $250–$400
Stage 3 Ceramic $350–$600
Auto Clutch (Rekluse) $849–$1,799
Brock’s/MPS Mods $259–$1,679

🧩 Can Performance Clutches Be Used for Daily Riding?

Yes—Stage 1 and 2 kits are designed to retain OEM-like feel while offering better durability and torque handling. Auto clutches like Rekluse RadiusX are especially street-friendly, eliminating stalling and reducing hand fatigue.

However, Stage 3 and puck-style clutches may be too aggressive for daily commuting due to harsh engagement and increased wear on the flywheel.

🔍 Final Thoughts

Upgrading your clutch is more than just a performance boost—it’s about control, reliability, and confidence. Whether you're launching off the line or carving through twisties, the right clutch mod transforms your bike’s behavior. If you're leaning toward street racing, a Stage 2 or 3 kit with ceramic or Kevlar friction material and heavy-duty springs will give you the edge without sacrificing too much comfort.

HardRider Magazine

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