Aftermarket Mercury 25 & 30HP 2-Stroke Service Kit (Japanese Models Starting With 0N Serial Nos) | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket Mercury 25-30 HP Japanese Two-Stroke Service Kit - Kit Reference: Application-matched 0N Japanese kit

Comprehensive aftermarket routine-maintenance kit assembled for 25-30 HP Japanese/Tohatsu-built twin-cylinder carburetted two-stroke outboard applications. It combines the ignition, cooling, filtration and drain-sealing components listed below so the main scheduled-service items can be renewed together.

⚙️ Key Features

Kit contents:

• 2 × NGK spark plug - Part Number: BR7HS-10

• 1 × Complete water-pump repair kit - Part Number: 8M0199643

• 1 × Thermostat - Part Number: 804540 (Tohatsu 345-01030-0 / 3H6010300M)

• 1 × Thermostat gasket - Part Number: 27-853702005

• 2 × Gearcase drain-plug seal - Part Number: 12-191833

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• Mercury/Quicksilver hyphenated and compact-number formats identify the same listed component

OEM / Related Numbers:

• BR7HS-10

• 8M0199643

• 804540

• 27-853702005

• 12-191833

Aftermarket / Verified Equivalents:

• Recmar, Sierra and Outboard Spares component-level replacements are available where the listed OEM reference is cross-matched

🚤 Compatibility

Commonly used on:

• Mercury/Mariner 25 HP and 30 HP Japanese-built two-stroke outboards with serial numbers beginning 0N

Typically suits:

• HP Range: 25-30 HP

• Engine Type: Japanese/Tohatsu-built twin-cylinder carburetted two-stroke outboard

• Year / Serial Range: 0N serial-number families; verify exact serial and pump-kit listing

• Identification: Confirm the complete engine model and serial number before ordering, particularly where shaft length, gear ratio or gearcase family changes the water-pump components.

🔌 Function

Provides the principal routine-service components used to maintain correct ignition, fuel delivery, cooling-water flow and fluid sealing. Renewing these items at the proper service interval helps support reliable starting, stable running, normal operating temperature and protection against contaminated oil or water-pump failure.

Common signs service is required:

• Hard starting, misfire, poor idle or reduced throttle response

• Restricted fuel flow, dirty filters or fuel starvation under load

• Weak or intermittent tell-tale flow, rising temperature or an overheat warning

• Cracked, hardened or missing impeller vanes

• Oil or gear-lubricant leakage from deteriorated drain-plug seals

• Scheduled annual, 100-hour or storage-return maintenance interval reached

📦 Condition

• Brand-new aftermarket service kit

• Supplied as new replacement components

• Supplied in suitable retail or equivalent packaging