Replacement Carburetor for Tohatsu/Nissan 4–5 HP 4-Stroke Outboards — Replaces 3R1-03200-1, Sierra 18-7608
Replacement Carburetor for Tohatsu/Nissan 4–5 HP 4-Stroke Outboards — Replaces 3R1-03200-1, Sierra 18-7608 is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Replacement Carburetor for Tohatsu/Nissan 4–5 HP 4-Stroke Outboards...
Replacement Carburetor for Tohatsu/Nissan 4–5 HP 4-Stroke Outboards — Replaces 3R1-03200-1, Sierra 18-7608 is backordered and will ship as soon as it is back in stock.
Product Details
This replacement carburetor assembly is intended for selected Tohatsu and Nissan 4-stroke outboard engines in the 4–5 HP range. It is listed as a replacement for Tohatsu part number 3R1-03200-1 and Sierra reference 18-7608.
Fitment can vary by model, production year, market and serial-number range. Before ordering, compare the part number on your original carburetor and confirm the complete engine model details against the compatibility information below.
- Aftermarket replacement carburetor assembly.
- Designed for direct replacement of the corresponding original assembly when the part-number and engine details match.
- Suitable for gasoline-powered marine outboard applications covered by the confirmed fitment.
- Carburetor assembly only; gasket and other installation hardware are not included unless specifically stated.
Part Number Matrix
The references below identify the replacement application. Part-number matching alone does not confirm every model, year or serial-number range.
| Brand | Part Number | Reference Type |
|---|---|---|
| Tohatsu | 3R1-03200-1 | Original-equipment reference |
| Sierra | 18-7608 | Aftermarket reference |
Engine & Model Compatibility
This replacement is associated with selected Tohatsu and Nissan 4-stroke outboards in the 4–5 HP class. Use the original carburetor number and the engine identification label to confirm fitment before purchase.
| Brand | Model Family | Rated HP | Stroke | Fitment Condition | Reference Part No. |
|---|---|---|---|---|---|
| Tohatsu | Selected 4–5 HP models | 4–5 HP | 4-Stroke | Confirm model, year and serial number | 3R1-03200-1 |
| Nissan | Selected 4–5 HP models | 4–5 HP | 4-Stroke | Confirm model, year and serial number | 3R1-03200-1 |
Technical Specs
- Product Type
- Carburetor Assembly
- Application
- Selected gasoline outboard engines
- Engine Class
- 4–5 HP
- Engine Type
- 4-Stroke
- Installation
- Direct replacement when fitment is confirmed
- Connection
- Direct mount
- Included Gasket
- Not included
- Part-Number References
- Tohatsu 3R1-03200-1; Sierra 18-7608
What’s in the Box
- 1 x Carburetor assembly
A mounting gasket, fuel-line components and adjustment tools are not included unless separately specified. Inspect the original hardware and replace worn or damaged sealing components as required.
Installation Notes
- Review the engine service information and verify the replacement part number before beginning work.
- Turn off the fuel supply, disconnect the battery if applicable, and work in a well-ventilated area away from ignition sources.
- Remove the air-intake components as required to access the carburetor.
- Label or photograph the throttle linkage, choke control and fuel-line positions before disconnecting them.
- Remove the original carburetor and discard the old gasket if it is damaged or specified as single-use.
- Clean the mounting surfaces and install the replacement using a suitable gasket in good condition.
- Reconnect the fuel line, throttle linkage and choke control, then check that each moves freely.
- Prime the fuel system, start the engine in accordance with the manufacturer’s procedure, and inspect carefully for fuel leaks.
- Set idle speed or other adjustments only as specified in the applicable service information.
Troubleshooting & FAQ
How do I confirm that this carburetor fits my engine?
Match the number on your original carburetor to Tohatsu 3R1-03200-1 or Sierra 18-7608, then confirm the engine brand, model, horsepower, 4-stroke configuration, year and serial-number range. If any of these details differ, obtain confirmation before ordering.
Does this listing include a gasket?
No. This listing is for the carburetor assembly only. A gasket may need to be purchased separately unless your existing gasket is approved for reuse and remains undamaged.
Will this carburetor fit a 6 HP outboard?
Do not assume compatibility with a 6 HP engine. The listed application is selected 4–5 HP 4-stroke outboards. A 6 HP engine should be treated as unconfirmed unless its exact model and original part number match the replacement application.
What symptoms can indicate a carburetor problem?
Possible symptoms include hard starting, unstable idle, stalling, hesitation during acceleration, poor running under load, excessive fuel use and fuel leakage. These symptoms can also result from fuel contamination, ignition faults, restricted fuel delivery or incorrect adjustment.
Will adjustment be required after installation?
Follow the applicable engine service procedure. Idle or mixture adjustment may be required, but do not change settings beyond the manufacturer’s specified range.
Is this an OEM carburetor?
No. This is an aftermarket replacement. It is intended to replace the corresponding original assembly when the part number and engine fitment are confirmed.
How often should a carburetor be replaced?
There is no universal replacement interval. Regular fuel-system maintenance can help prevent deposits and corrosion. Replace the carburetor when cleaning and approved servicing cannot restore proper operation, or when the assembly is damaged or leaking.
What should I do if the part does not match my original?
Do not force installation or modify the mounting, linkage or fuel connections. Compare the part number and engine identification details, and contact support before installation if the configuration does not match.
Safety & Important Info
- Verify the original part number and complete engine identification before purchase.
- Use only in the application for which fitment has been confirmed.
- Gasoline is flammable. Work in a ventilated area, keep the part away from flames and relieve fuel-system hazards before removal.
- Inspect all fuel connections after installation and stop immediately if leakage is observed.
- Professional installation is recommended when you are not familiar with marine fuel systems or carburetor adjustment.
About Sea Sierra
- Marine Replacement Parts — We supply replacement components for a range of marine service applications.
- Fitment-Focused Listings — Verify the complete engine and part-number details before installation.
- Support for Installation Questions — Contact support if the replacement does not match the original configuration or application.
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