3F0-03100-4 Carburetor Fits Tohatsu & Nissan 3.5B2, 3.5A2 (3.5 HP)
3F0-03100-4 Carburetor Fits Tohatsu & Nissan 3.5B2, 3.5A2 (3.5 HP) is backordered and will ship as soon as it is back in stock.
Need help checking fitment?
Need help checking fitment?
Send us the product link, your engine brand, full model and serial number, and the reference on your original part. Include the year if known.
Shipping & delivery
Shipping & delivery
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Returns & warranty support
Returns & warranty support
For help with an order or product issue, send your order number, part reference and a description of the issue. Include photos where relevant.
Product Overview
XR MARINE · CARBURETORS & REPAIR KITS
3F0-03100-4 Carburetor Fits Tohatsu, Nissan, Mercury & Mariner 3.5B2, 3.5A2 (3.5 HP) - XR Marine
This product is a replacement carburetor assembly, not a carburetor repair kit. It is designed for specified Tohatsu and Nissan 2.5 HP and 3.5 HP 2-stroke outboards (models 2.5A2, 3.5A2, and 3.5B2), as well as specified Mercury and Mariner 2 HP, 2.5 HP, 3 HP, and 3.3 HP single-cylinder 2-stroke outboard applications.
Use this carburetor when replacing the complete carburetor unit within the listed model and engine-configuration applications. Always compare your engine designation and complete original carburetor reference number, including suffixes such as -0, -4, -5, A1, and T06, before ordering.
Product Specifications
Key product details for identification and comparison.
Fitment
The 3F0-03100-4 Carburetor from XR Marine fits Tohatsu and Nissan 2.5A2 (2.5 HP), 3.5A2 (3.5 HP), and 3.5B2 (3.5 HP) 2-stroke outboards, and fits Mercury and Mariner 2 HP, 2.5 HP, 3 HP, and 3.3 HP 2-stroke outboards when the single-cylinder (cylinder_count: 1) condition is met in the applications listed below.
Match the full model designation on your engine identification plate against each individual entry below, verify the 2-stroke cycle and single-cylinder requirement where noted, and compare your complete original carburetor reference number including its suffix. Horsepower alone is not sufficient to confirm compatibility.
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Brand: Tohatsu (Nissan / Tohatsu Marine Outboard) | Model: 3.5B2 | Power: 3.5 HP | Stroke: 2-Stroke✓ Fits
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Brand: Tohatsu (Nissan / Tohatsu Marine Outboard) | Model: 3.5A2 | Power: 3.5 HP | Stroke: 2-Stroke✓ Fits
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Brand: Tohatsu (Nissan / Tohatsu Marine Outboard) | Model: 2.5A2 | Power: 2.5 HP | Stroke: 2-Stroke✓ Fits
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Brand: Nissan (Nissan / Tohatsu Marine Outboard) | Model: 3.5B2 | Power: 3.5 HP | Stroke: 2-Stroke✓ Fits
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Brand: Nissan (Nissan / Tohatsu Marine Outboard) | Model: 3.5A2 | Power: 3.5 HP | Stroke: 2-Stroke✓ Fits
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Brand: Nissan (Nissan / Tohatsu Marine Outboard) | Model: 2.5A2 | Power: 2.5 HP | Stroke: 2-Stroke✓ Fits
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Brand: Mercury (Mercury Mariner) | Power: 3.3 HP | Stroke: 2-Stroke | Restriction: Single-cylinder (cylinder_count: 1); model, year, and serial range not specified! Check conditions
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Brand: Mercury (Mercury Mariner) | Power: 2.5 HP | Stroke: 2-Stroke | Restriction: Single-cylinder (cylinder_count: 1); model, year, and serial range not specified! Check conditions
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Brand: Mercury (Mercury Mariner) | Power: 2 HP | Stroke: 2-Stroke | Restriction: Single-cylinder (cylinder_count: 1); model, year, and serial range not specified! Check conditions
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Brand: Mercury (Mercury Mariner) | Power: 3 HP | Stroke: 2-Stroke | Restriction: Single-cylinder (cylinder_count: 1); model, year, and serial range not specified! Check conditions
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Brand: Mariner (Mercury Mariner) | Power: 3.3 HP | Stroke: 2-Stroke | Restriction: Single-cylinder (cylinder_count: 1); model, year, and serial range not specified! Check conditions
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Brand: Mariner (Mercury Mariner) | Power: 2.5 HP | Stroke: 2-Stroke | Restriction: Single-cylinder (cylinder_count: 1); model, year, and serial range not specified! Check conditions
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Brand: Mariner (Mercury Mariner) | Power: 2 HP | Stroke: 2-Stroke | Restriction: Single-cylinder (cylinder_count: 1); model, year, and serial range not specified! Check conditions
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Brand: Mariner (Mercury Mariner) | Power: 3 HP | Stroke: 2-Stroke | Restriction: Single-cylinder (cylinder_count: 1); model, year, and serial range not specified! Check conditions
OEM & Part Number References
Use the complete reference number, including its suffix, when comparing parts. Reference numbers do not confirm that every version is interchangeable.
What's Included
Check the supplied components before planning your repair.
- Carburetor (included)
Installation Guide
General installation overview. Follow the service manual for your exact engine and carburetor configuration. Fuel-system work requires the appropriate skills and precautions.
- Verify identification and prepare the engine: Confirm your outboard model, 2-stroke cycle, cylinder count, and original carburetor part number before starting work. Shut off the engine, allow it to cool completely, isolate the fuel supply and ignition system as directed by your service manual, and work in a well-ventilated area away from ignition sources.
- Remove the existing carburetor and compare interfaces: Note or photograph the routing and orientation of the fuel line, throttle linkage, and choke linkage. Remove the old carburetor assembly according to your service manual and compare its mounting flange, linkage connections, and fuel inlet side-by-side with the replacement carburetor.
- Install, inspect for leaks, and perform service-manual checks: Mount the replacement carburetor and reconnect the linkages and fuel line per factory procedures. Open the fuel supply and check thoroughly for any fuel seepage before starting. Only test-run the outboard with proper cooling water supplied, verify smooth throttle and choke operation, and stop the engine immediately if any fuel leak, linkage binding, or abnormal running occurs.
Before You Order
A careful fitment check helps you choose the right part the first time.
- Match the full engine model designation on the identification plate.
- Verify the engine configuration and any listed conditions (for example, single-cylinder 2-stroke for Mercury and Mariner applications, or 2.5A2, 3.5A2, and 3.5B2 model designations for Tohatsu and Nissan).
- Compare the complete OEM reference number, including its suffix. Horsepower or appearance alone is not enough.
- Confirm the package contents and the quantity needed for your repair.
- Keep hyphens, letters, and suffixes such as -0, -4, -5, A1, and T06 when comparing part numbers; do not assume a number without an "A" suffix is interchangeable with an "A" version.
Need help checking fitment? Have your engine identification details, the existing part number and clear photos ready when you contact XR Marine.
Ask XR Marine About FitmentWhy XR Marine
Carburetors are our focus. Fitment comes first.
XR Marine specializes in marine carburetors, carburetor repair kits and the related parts needed for these repairs. We keep our focus on this product line so that product information stays centered on the details that matter: engine applications, complete part-number references and what is included.
Use our individual fitment entries and part references to compare your application, then contact XR Marine if you need help before ordering.
Shipping
Free shipping on all orders. No minimum order value.
For questions about delivery to your destination or delivery timing, contact XR Marine before placing your order.
Contact XR Marine About ShippingLifetime Warranty
XR Marine provides lifetime warranty coverage for product quality defects. Normal wear and tear is excluded.
- Covered: product quality defects.
- Not covered: normal wear and tear.
Contact XR Marine for warranty assistance. Having your order details and a description of the issue available can help us understand your request.
Contact XR Marine About WarrantyFrequently Asked Questions
Answers to common questions about this product and its application.
Is this product a complete carburetor or a carburetor repair kit?
This product is a replacement carburetor assembly, not a carburetor repair kit. It is used when replacing the carburetor unit on the specified 2-stroke outboard applications.
Which Tohatsu and Nissan outboard models are listed for this carburetor?
The confirmed Tohatsu and Nissan applications are 2-stroke models 2.5A2 (2.5 HP), 3.5A2 (3.5 HP), and 3.5B2 (3.5 HP). Check your engine identification plate to confirm you have one of these exact model designations and match your original carburetor reference number.
What do I need to check for Mercury and Mariner 2 HP, 2.5 HP, 3 HP, and 3.3 HP outboards?
For Mercury and Mariner applications, the engine must be a single-cylinder (1-cylinder), 2-stroke outboard rated at 2 HP, 2.5 HP, 3 HP, or 3.3 HP. Because specific model years and serial ranges are not specified in the application records, you must also match the complete original carburetor reference number on your existing unit.
Why do suffixes like -0, -4, -5, A1, and T06 matter when comparing part numbers?
Reference-number suffixes identify specific carburetor versions. Similar-looking base numbers do not guarantee that two versions are interchangeable, and you should not assume a number without an "A" suffix is identical to the corresponding "A" version. Always compare the full number including letters and hyphens.
Can I order based on horsepower alone?
No. Horsepower alone is not enough to identify the correct carburetor. Outboards of the same horsepower rating can use different engine cycles, model revisions, or carburetor configurations, so always verify both the engine details and the complete OEM reference number.
What shipping and warranty policies apply to this carburetor?
XR Marine offers free shipping on all orders with no minimum order value, and provides lifetime warranty coverage for product quality defects (normal wear and tear is excluded).
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