Under Oil Gasket – Fits Suzuki DT20, DT25, DT30 (1986-2002) (Replaces 11433-96330)

Product Details

This Under Oil Gasket provides a secure seal for the powerhead base on a range of Suzuki 2-Stroke outboards from 20–30 HP (1986–2002), including DT20, DT25, and DT30 models. It is engineered as a direct-fit component, ensuring reliable performance and preventing oil leaks.

This part serves as a direct interchange for Suzuki OEM part numbers 11433-96301, 11433-96302, 11433-96310, and 11433-96311.

• Designed for direct replacement of the original powerhead base gasket.
• Seals the under-oil section to prevent fluid loss and maintain pressure.
• Built with durable materials for longevity in marine environments.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Engine & Model Compatibility

Confirm your engine model/year in the table below.

For Suzuki models, ensure your engine's model code and year fall within the specified ranges for DT20, DT25, and DT30 series.

Technical Specs

Product Type

Under Oil Gasket

Installation

Direct replacement

Fuel Type

Gasoline

Housing Material

Gasket material

Housing Color

Natural

Dimensions

Length: 26.5 cm, Width: 15.8 cm, Height: 0.3 cm

Weight

0.05 kg (1.76 oz)

Other Technical Attributes

Powerhead base sealing gasket

What’s in the Box

• 1 x Under Oil Gasket (11433-96330)

Installation Notes

1. Disconnect the battery and ensure the engine is cool.
2. Drain the engine oil completely to prevent spills.
3. Carefully remove any components obstructing access to the powerhead base.
4. Remove the old gasket and thoroughly clean both mating surfaces of any residue or old sealant.
5. Position the new gasket, ensuring all bolt holes align perfectly.
6. Reassemble all components, tightening bolts to the manufacturer's specified torque sequence and values.
7. Refill the engine with the correct type and amount of oil.
8. Start the engine and carefully inspect for any signs of oil leaks around the new gasket.

Troubleshooting & FAQ

Safety & Important Info

• Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
• This is an aftermarket replacement, not an OEM component.
• Professional installation is recommended for safety and performance.

About Sea Sierra

• Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
• Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
• Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.