Aftermarket Mercury 6HP, 8HP, 9.9HP 2-Stroke Service Kit (Japanese Models) | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket major service kit for Japanese-built Mercury and Mariner 6HP, 8HP and 9.9HP carburetted two-stroke outboards, normally identified by an 0N serial-number prefix. These engines share the Tohatsu-manufactured M6/M8/M9.8 platform and use the 3B2-87322-series internal water-pump repair kit rather than the USA-built Mercury 46-42089A5 assembly.

The package contains the ignition, fuel, drain-seal and pump components required for this service configuration. The upper water-pump housing is normally separate from the internal repair kit unless a supplier explicitly states that a complete-housing version is included.

⚙️ Key Features

• Major service package for Japanese-built Mercury/Mariner two-strokes

• Correct for 0N-prefix Tohatsu-derived engine family

• Includes spark plugs, fuel filter, drain seals and internal pump repair kit

• Full component breakdown of the 3B2-87322 pump kit

• Cross-referenced to Mercury, Tohatsu, BRP/Evinrude, Sierra and Mallory numbers

📋 Kit Contents

• 2 × NGK BP7HS-10 spark plugs

• 1 × Fuel filter - Mercury 35-16248; current service replacement may be supplied as 8M0157133

• 2 × Gearcase drain/fill screw sealing washers - Mercury 12-191833

• 1 × Internal water-pump repair kit - Tohatsu 3B2-87322-0; superseded through 3B2-87322-1 and 3B2-87322-2

Water-pump kit component breakdown:

• 1 × Impeller - Tohatsu 3B2-65021-1

• 1 × Impeller key - Tohatsu 3B2-65022-0

• 1 × Pump-case liner/cup - Tohatsu 3B2-65011-0

• 1 × Guide/wear plate - Tohatsu 3B2-65025-0

• 1 × Pump-case gasket - Tohatsu 3B2-65018-2

• 1 × Guide-plate gasket - Tohatsu 3B2-65029-2

• 1 × Lower pump-case gasket - Tohatsu 3B2-65020-1

• 4 × Pump bolts - Tohatsu 9161E3-0650

• 4 × Pump-bolt washers - Tohatsu 940103-0600

Related but normally separate:

• Upper water-pump housing - Tohatsu 3B2-65016-0; replace separately if warped, melted or scored

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• Tohatsu 3B2-87322-0 → 3B2-87322-1 → 3B2-87322-2

OEM / Other-Brand References:

• Mercury/Mariner 46-803750A03 / 803750A03 - Corresponding pump repair kit reference

• Mercury/Mariner 47-803748Q01 / 803748K01 - Impeller references

• BRP/Evinrude 5040537 - Shared-platform pump-kit reference

• Mercury 35-16248 → 8M0157133 - Fuel-filter service progression

Verified Aftermarket Equivalents:

• Sierra 18-48317 - Water-pump repair kit equivalent

• Mallory 9-48317 - Water-pump repair kit equivalent

• Recmar replacement fuel filter cross-referenced to Mercury 35-16248 / 8M0157133

🚤 Compatibility

Commonly used on selected:

• Mercury 6HP Japanese-built two-stroke

• Mercury 8HP Japanese-built two-stroke

• Mercury 9.9HP Japanese-built two-stroke, corresponding to the Tohatsu 9.8HP platform

• Mariner versions of the same Japanese-built engine family

• Tohatsu M6, M8 and M9.8 shared-platform applications when the listed pump and service references match

Identification Requirements:

• Serial number normally begins with 0N

• Japanese/Tohatsu-derived compact twin-cylinder two-stroke powerhead

• 3B2-87322 / 46-803750A03 internal pump configuration

Important Exclusions:

• Not for USA-built Mercury 6HP/8HP/15HP models using 46-42089A5

• Not for four-stroke 0R-prefix engines

• Not for 9.9HP models using the larger 323cc or BigFoot gearcase families

• Upper pump housing 3B2-65016-0 is not included unless specifically shown in the supplied package

🔌 Function

Provides the ignition, fuel-filtration, gearcase sealing and water-pump components required for a scheduled major service of the Japanese-built compact two-stroke family. The internal pump kit renews the impeller, liner, wear plate, gaskets, key and mounting hardware while allowing a serviceable upper housing to be reused.

Common signs service is due include:

• Poor starting, plug fouling or uneven running

• Restricted fuel supply

• Weak cooling-water stream or elevated engine temperature

• Cracked impeller vanes, scored liner or leaking pump gaskets

• Gear-lube seepage around drain/fill screws

📦 Condition

• Brand-new aftermarket service kit

• All supplied components are new and unused

• Current superseding Tohatsu or Mercury references may be supplied

• Confirm the 0N-prefix Japanese engine family before installation