MSV Racing OptiFlo™ High-Flow Water Pump Cover for Honda CR500 (1985-2001)

Increase Coolant Flow. Reduce Heat. Maintain Maximum Power.

Flow Bench Tested: The OptiFlo Cover increased coolant flow by up to 1.3 GPM compared to OEM and competing designs.

The MSV Racing OptiFlo™ High-Flow Water Pump Cover was engineered specifically for the Honda CR500 to improve coolant flow, reduce restriction, and help your engine run cooler under demanding conditions.

Unlike OEM and many aftermarket billet water pump covers, the OptiFlo™ Cover features a fully radiused internal flow path designed to reduce turbulence and backpressure while maximizing coolant flow.

Proven Benefits

✔ Average 1.3 GPM Increase in Coolant Flow

✔ Reduced Turbulence and Backpressure

✔ Improved Cooling Efficiency

✔ Helps Reduce Heat Soak

✔ O-Ring Sealed Design

✔ No Gaskets or Separator Plates Required

✔ CNC Machined Billet Aluminum Construction

Why Cooling Matters

Every horsepower your CR500 produces creates heat.

As temperatures increase, engine performance begins to decline. Excess heat contributes to power loss, inconsistent performance, and increased stress on engine components.

The OptiFlo™ High-Flow Water Pump Cover helps your cooling system work more efficiently by allowing coolant to move through the engine and radiator system with less restriction.

The result is improved cooling performance and more consistent power under load.

Engineered for Maximum Coolant Flow

The biggest difference between the OptiFlo™ Cover and OEM-style covers is what you can't see from the outside.

Fully Radiused Internal Design

Most water pump covers use sharp internal turns that disrupt coolant flow and create turbulence.

The OptiFlo™ Cover utilizes a fully radiused internal flow path that:

• Improves coolant velocity
• Reduces turbulence
• Reduces backpressure
• Improves overall pump efficiency

Better flow equals better cooling.

Flow Tested Performance

When used with either an OEM impeller or the MSV Racing OptiFlo™ "Phi" High-Volume Impeller, testing showed:

Average Coolant Flow Increase: +1.3 GPM

More coolant flow means more heat removed from the engine.

The Perfect Match for the OptiFlo™ "Phi" Impeller

For maximum cooling performance, pair the OptiFlo™ High-Flow Water Pump Cover with the MSV Racing OptiFlo™ "Phi" High-Volume Impeller.

Together they create one of the most efficient CR500 cooling systems available.

Ideal for:

• Motocross
• Woods Riding
• Hill Climb
• Sand Drags
• Dunes
• Outlaw Kart Racing
• Supermoto
• Trail Riding

Built to Last

Precision CNC machined from billet aluminum and available in:

• Shiny Billet
• Military-Spec Black Anodized (MIL-A-8625)
• Military-Spec Red Anodized (MIL-A-8625)

The OptiFlo™ Cover is designed to provide years of reliable service while improving both performance and appearance.

O-Ring Sealed Design

Unlike OEM-style systems that require multiple gaskets and separator plates, the OptiFlo™ Cover utilizes a premium high-temperature FDM O-ring seal.

Benefits include:

• Reduced leak potential
• Simplified installation
• Improved reliability

Complete Installation Kit Included

Each kit includes:

• MSV Racing OptiFlo™ High-Flow Water Pump Cover
• High-Temperature FDM O-Ring
• Two New Dowel Pins

Everything needed for installation.

Replaces OEM Components

• 19221-KA5-690 Water Pump Cover
• 19229-MAC-680 Water Pump Cover Gasket
• 19222-KA5-690 Water Pump Separator
• 94301-08100 Dowel Pin
• 90701-679-000 Dowel Pin

MSV Racing – Engineered Cooling for the Legendary CR500

If you're serious about keeping your CR500 cooler, more efficient, and performing at its best, the OptiFlo™ High-Flow Water Pump Cover is a must-have upgrade.