MSV Racing High-Flow Water Pump Impeller & DLC Shaft Kit for Yamaha RZ350

✔ Up to 20°F Cooler

✔ +2.0 GPM More Coolant Flow Than OEM

✔ DLC-Coated Shaft That Will Never Wear Out

The Yamaha RZ350 is one of the most iconic two-stroke street bikes ever built, but like any performance machine, horsepower creates heat.

The MSV Racing High-Flow Impeller & DLC Shaft Kit was engineered to dramatically improve coolant flow, reduce operating temperatures, and help prevent power-robbing heat soak in both stock and modified RZ350 engines.

Flow testing showed the MSV Racing design outflows OEM and competing aftermarket impellers while reducing operating temperatures by up to 20°F.

Proven Benefits

✔ Up to 20°F Lower Operating Temperatures

✔ Up to 2.0 GPM More Flow Than OEM

✔ Up to 1.5 GPM More Flow Than Competing Aftermarket Impellers

✔ Reduced Heat Soak

✔ Improved Cooling Efficiency

✔ DLC-Coated Shaft for Extreme Durability

✔ Includes Bearing and Gasket

✔ Direct Bolt-On Installation

Real-World Proven Results

★★★★★

"The results were much better than I expected! I was thinking at best that it might drop 5°, maybe 10° at most, but I saw over a 20° drop my first session with the MSV impeller."

— Mark Morrow

Owner, Mark Morrow Road Racing School & Services

Former Headmaster and Creator of the AHRMA Academy of Road Racing

★★★★★

"Upon starting my RZ and letting it warm up on the stand, I could already tell a difference. It stayed cooler on the temp gauge. Even when revving it you can watch the needle drop as the RPM increases. The real test came during a 150-mile Memorial Day weekend ride. Temps climbed into the upper 80s and the RZ ran cooler the entire time. Even sitting in traffic it never overheated. I'm sold! A must-have for stock or built RZs."

— Steve Heisler

★★★★★

"Very happy with this product. It maintained temperature during 90+ degree summer weather and now that temperatures have cooled off in the Northeast, it actually runs a little below halfway on the gauge with a 50°C thermostat on my street RZ."

— Wayne Johnson

★★★★★

"I had the bike apart anyway so I figured why not optimize it? The biggest surprise was while synchronizing the carbs. I thought for sure I would need a fan for airflow, but it really never got hot—not in the least. So, yeah...it makes a difference."

— Clifford

Why Cooling Matters

Every horsepower generated by your RZ350 creates heat that must be removed by the cooling system.

As engine temperatures rise:

• Power decreases
• Heat soak increases
• Consistency suffers
• Engine stress increases

Keeping coolant temperatures under control helps maintain performance and reliability whether you're riding on the street, canyon carving, track riding, or road racing.

More Coolant Flow = More Cooling Capacity

The MSV Racing Impeller was specifically engineered to maximize coolant flow through the RZ350 cooling system.

Flow testing demonstrated:

Flow Comparison

OEM Impeller = Baseline

MSV Racing Impeller = +2.0 GPM Average Flow Increase

Competing Aftermarket Impellers = Lower Flow

MSV Racing Impeller = +1.5 GPM Average Flow Increase

Increasing coolant flow reduces the cycle time between the engine and radiator, allowing heat to be removed faster and more efficiently.

The result is lower temperatures and more consistent engine performance.

Engineered for Maximum Efficiency

High-Flow 7075-T6 Billet Impeller

Precision machined from premium 7075-T6-511 aluminum, the impeller was designed to optimize the RZ350 water pump housing for maximum flow and efficiency.

Precision Ground Stainless Steel Shaft

The shaft is manufactured from premium 304 stainless steel and incorporates a reduced-diameter cooling-port section developed through FEA analysis.

Benefits include:

• Improved coolant entry into the impeller
• Reduced turbulence
• Reduced backpressure
• Increased flow efficiency
• Exceptional strength

DLC-Coated Shaft Technology

Unlike conventional shafts, the MSV Racing shaft receives a Diamond-Like Carbon (DLC) coating.

Benefits include:

✔ Extreme Wear Resistance

✔ Self-Lubricating Surface

✔ Reduced Seal Drag

✔ Longer Seal Life

✔ Corrosion Resistance

✔ Virtually Zero Shaft Wear

The DLC coating measures approximately 2500 HV on the Vickers hardness scale—more than three times harder than many heat-treated steels.

Simply Put:

The shaft is engineered to last the life of the motorcycle.

Complete Kit Includes

• High-Flow Billet Impeller
• DLC-Coated Stainless Steel Shaft
• Koyo Bearing
• Custom Laser-Cut Gasket

Everything needed for installation.

Keep Your RZ350 Running Cooler and Stronger

Whether you're restoring a classic RZ350, building a high-performance street bike, or competing on the track, the MSV Racing High-Flow Impeller & DLC Shaft Kit delivers cooling performance that OEM simply cannot match.

MSV Racing—Engineering the Future of Two-Stroke Performance.