Upgrade your fourth-generation Honda Civic or second-generation CRX with the Hasport EFSTK D-Series Performance Engine Mount Kit, designed as a direct performance replacement for the factory engine and transmission mounts in 1988–1991 Honda Civic and CRX models equipped with compatible D-Series engines and manual transmissions.

Engineered specifically for the EF chassis, the Hasport EFSTK replaces the factory left-hand, right-hand, and rear engine mounts with precision-manufactured performance mounting components featuring durable polyurethane bushings.

Unlike traditional factory rubber mounts, which can deteriorate and allow excessive engine movement over time, Hasport's polyurethane mounting system provides increased drivetrain stability, improved throttle response feel, and more consistent engine positioning during acceleration, deceleration, and shifting.

Whether you're restoring a classic EF Civic, upgrading a naturally aspirated D16A6-powered CRX Si, or building a turbocharged D-Series performance car, the EFSTK delivers dependable engine support without requiring a complete engine swap.

Designed for Factory D-Series Engine Applications

The Hasport EFSTK is specifically engineered for 1988–1991 Honda Civic and CRX applications using the original-generation D-Series engine mounting configuration.

Compatible engine applications include:

• Honda D15B1

• Honda D15B2

• Honda D16A6

• Compatible 1988–1991 JDM SOHC ZC engines

• Compatible 1988–1991 JDM DOHC ZC engines

The EFSTK is intended for vehicles retaining the appropriate D-Series manual transmission and factory-style mounting locations.

This makes it an excellent upgrade for enthusiasts who want to retain their original D-Series drivetrain while improving engine stability and mounting durability.

Performance Replacement for Factory Engine Mounts

Factory Honda engine mounts use rubber isolators to absorb engine vibration and allow controlled drivetrain movement.

Over time, these rubber components can crack, soften, or separate, leading to excessive engine movement and reduced drivetrain stability.

The Hasport EFSTK replaces three primary mounting locations:

• Left-hand engine mount

• Right-hand engine mount

• Rear engine mount

The performance polyurethane bushings help control drivetrain movement more effectively than aging factory rubber mounts, making them especially beneficial for modified engines and aggressive driving applications.

Precision-Machined Billet Aluminum Construction

Hasport manufactures its performance engine mounts using CAD/CAM engineering technology and CNC-machined billet aluminum construction.

The lightweight aluminum mounting components provide excellent structural strength while maintaining precise engine and transmission positioning.

This combination of precision manufacturing and durable materials makes the EFSTK suitable for both street-driven vehicles and demanding motorsport applications.

Performance Polyurethane Bushings

The Hasport EFSTK is available with four polyurethane bushing hardness options, allowing enthusiasts to select the appropriate balance between drivetrain control and passenger comfort.

Softer bushings are better suited for street-driven vehicles, while firmer configurations provide increased drivetrain rigidity for aggressive driving and competition applications.

Features

• 1988–1991 Honda Civic Compatibility: Designed for fourth-generation Civic EF chassis applications.

• 1988–1991 Honda CRX Compatibility: Fits compatible second-generation CRX models.

• D-Series Engine Compatibility: Designed for original-generation D-Series engines and compatible JDM ZC configurations.

• Factory Drivetrain Replacement: Upgrades the original engine mounting system without requiring an engine swap.

• Three-Mount Replacement Kit: Replaces the left-hand, right-hand, and rear engine mounts.

• Manual Transmission Applications: Designed for compatible factory-style manual transmission configurations.

• CNC-Machined Billet Aluminum: Lightweight, durable mounting construction.

• CAD/CAM Engineered: Designed for accurate fitment and dependable structural strength.

• Performance Polyurethane Bushings: Help reduce excessive engine and transmission movement.

• Improved Drivetrain Stability: Helps maintain consistent engine positioning during acceleration and shifting.

• Reduced Engine Rocking: Limits unwanted drivetrain movement under load.

• Improved Shifting Consistency: Reduced drivetrain movement can help stabilize transmission positioning.

• Four Bushing Hardness Options: Available in 62A, 70A, 88A, and 94A configurations.

• Naturally Aspirated and Turbocharged Applications: Suitable for compatible modified D-Series engines.

• Hasport Limited Lifetime Warranty: Backed by Hasport's manufacturer warranty against defects, subject to warranty terms.

EFSTK vs. EFD2

Hasport EFSTK: Designed for 1988–1991 Honda Civic and CRX applications using original-generation D-Series engines or compatible 1988–1991 JDM SOHC/DOHC ZC engines.

Hasport EFD2: Designed for installing compatible 1992–1995 Civic D-Series engines with a two-bolt engine block bracket or 1996–2000 D-Series engines into the supported EF chassis.

Selecting the correct mounting configuration is essential because engine-side mounting provisions differ between D-Series generations.

Popular Performance Applications

1988–1991 Honda Civic D-Series Restoration

An excellent upgrade for replacing deteriorated factory engine mounts while maintaining the original D-Series drivetrain.

Honda CRX Si D16A6 Performance Builds

Provides increased drivetrain stability for modified D16A6-powered CRX Si applications.

Naturally Aspirated D-Series Builds

Suitable for engines equipped with performance camshafts, intake manifolds, headers, and other naturally aspirated modifications.

Turbocharged D-Series Applications

Helps control excessive drivetrain movement in compatible turbocharged D-Series builds.

JDM ZC Engine Applications

Supports compatible 1988–1991 JDM SOHC and DOHC ZC engine configurations.

Autocross and Road Racing

Firmer polyurethane bushings help reduce unwanted engine movement during acceleration, braking, and cornering.

Drag Racing Applications

Provides increased drivetrain rigidity for aggressive launches and high-load driving conditions.

Daily-Driven Performance Vehicles

The 62A Street bushing option provides a balance of drivetrain control and vibration isolation for everyday use.

Additional Information

• Manufacturer: Hasport Performance
• Part Number: EFSTK
• Product Type: Performance Engine and Transmission Mount Kit
• Vehicle Application: 1988–1991 Honda Civic / CRX
• Chassis Compatibility: EF / ED
• Engine Compatibility: 1988–1991 Honda D-Series / Compatible JDM SOHC and DOHC ZC
• Transmission Compatibility: Compatible Manual Transmission
• Mount Locations: Left-Hand / Right-Hand / Rear
• Mount Construction: CNC-Machined Billet Aluminum
• Bushing Material: Performance Polyurethane
• Available Bushing Hardness Options: 62A / 70A / 88A / 94A
• Installation Type: Factory Engine Mount Replacement / Performance Upgrade
• AWD Civic Wagon Compatibility: No
• Manufacturer Warranty: Limited Lifetime Warranty Against Defects, Subject to Hasport Terms

Available Polyurethane Bushing Hardness Options

62A – Street

The softest available polyurethane configuration, designed for street-driven vehicles where vibration isolation and everyday comfort are important.

Recommended for daily drivers, lightly modified D-Series engines, and enthusiasts looking for improved drivetrain control without excessive vibration.

70A – Race

Provides increased drivetrain rigidity for aggressive street driving, spirited performance applications, and occasional track use.

A suitable option for modified naturally aspirated and turbocharged D-Series engines where additional engine stability is desired.

88A – Extreme Race

A significantly firmer polyurethane configuration intended for demanding motorsport applications.

Recommended for competition-oriented vehicles where minimizing drivetrain movement takes priority over passenger comfort.

94A – Most Extreme Race

The stiffest available polyurethane configuration, intended for dedicated racing applications.

Provides maximum drivetrain rigidity among Hasport's standard polyurethane options, with substantially increased vibration transfer compared with softer bushings.

Note: Increasing bushing hardness generally increases noise, vibration, and harshness inside the vehicle cabin.

Common Reasons for Replacement or Upgrade

• Worn Factory Engine Mounts: Aging rubber mounts can crack, soften, or separate.

• Excessive Engine Movement: Polyurethane bushings help reduce unwanted drivetrain rocking.

• Improved Drivetrain Stability: Helps maintain consistent engine and transmission positioning.

• Performance Engine Upgrades: Provides additional mounting support for modified D-Series engines.

• Turbocharged Applications: Helps control drivetrain movement under increased engine torque.

• Improved Shifting Consistency: Reduced engine movement can help stabilize transmission positioning during gear changes.

• Reduced Mount Deflection: Limits excessive movement during acceleration and deceleration.

• Classic Honda Restoration: Replaces aging factory mounting components with durable performance alternatives.

• Street and Motorsport Applications: Multiple bushing hardness options accommodate different driving requirements.

Installation Notes

1. Verify Vehicle Compatibility: Confirm that the vehicle is a 1988–1991 Honda Civic or CRX equipped with a compatible manual transmission.

2. Confirm Engine Compatibility: Identify the exact D-Series or JDM ZC engine being used.

3. Inspect the Existing Mounts: Check the factory left-hand, right-hand, and rear engine mounts for deterioration, cracking, or separation.

4. Verify Transmission Configuration: Confirm that the vehicle uses a compatible factory-style manual transmission mounting arrangement.

5. Support the Engine and Transmission: Use appropriate lifting equipment or an engine support fixture before removing any mounting components.

6. Remove the Factory Engine Mounts: Follow the applicable Honda service procedures for removing the original mounting components.

7. Inspect Factory Mounting Points: Check the chassis mounting locations and engine-side brackets for damage or corrosion.

8. Install the Hasport Left-Hand Mount: Position the replacement mount according to Hasport's installation instructions.

9. Install the Hasport Right-Hand Mount: Verify proper alignment with the factory engine-side bracket and chassis mounting location.

10. Install the Hasport Rear Mount: Ensure proper engagement with the transmission and rear mounting location.

11. Check Engine Positioning: Verify that the drivetrain is correctly positioned and that the mounts are not under unnecessary preload.

12. Inspect Surrounding Components: Check clearance around the exhaust, radiator hoses, intake components, wiring, and transmission linkage.

13. Torque Mounting Hardware: Follow Hasport's installation instructions and applicable Honda factory torque specifications.

14. Inspect Shifter Operation: Verify smooth engagement of all gears and confirm that the drivetrain does not interfere with the shift linkage.

15. Perform a Final Inspection: Check mounting hardware, drivetrain positioning, and surrounding component clearances before operating the vehicle.

16. Recheck After Initial Use: Inspect mounting hardware and drivetrain components after the initial driving period.

Installation Note: This is a performance replacement mount kit for compatible factory-style D-Series drivetrains. A hydraulic-clutch transmission conversion requires additional components, including the appropriate Hasport EFDHC and EFDHCL parts.

What's Included

• Hasport left-hand engine mount

• Hasport right-hand engine/transmission mount

• Hasport rear engine mount

• Performance polyurethane bushings in the selected hardness configuration

• Associated mounting hardware supplied by Hasport

Important: The EFSTK is designed to replace the three primary engine mounting locations. The engine, transmission, clutch conversion components, shift linkage, and other drivetrain components are not included.

Restore drivetrain stability and improve engine control in your classic Honda with the Hasport EFSTK D-Series Performance Engine Mount Kit, designed for 1988–1991 Honda Civic and CRX applications.

Featuring CNC-machined billet aluminum construction, precision-engineered mounting components, and performance polyurethane bushings, the EFSTK provides a durable upgrade over aging factory rubber engine mounts.

Whether you're restoring an original D-Series Civic, upgrading a D16A6-powered CRX Si, or building a turbocharged EF performance car, Hasport delivers dependable drivetrain support for your application.