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Carburettor (Tohatsu)

Carburettor Slow Jet #38 3R1-03254-0

Brand: Tohatsu

SKU: 3R1-03254-0

$23.45
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The Genuine Tohatsu 3R1-03254-0 Carburettor Slow Jet #38 is a precision fuel-metering component designed for selected 2.5HP–6HP 4-stroke outboard motors. Installed inside the carburettor, it regulates fuel delivery through the low-speed circuit to support smooth idling, starting and initial throttle response. Ideal for replacing blocked, damaged or incorrectly sized jets, this genuine replacement component helps restore correct carburettor operation and reliable engine performance.

Key benefits

Key Benefits

  • - Genuine Tohatsu OEM replacement carburettor slow jet.
  • - Factory-specified #38 jet size for compatible carburettors.
  • - Helps regulate fuel delivery at idle and low throttle openings.
  • - Supports smooth idling and initial acceleration.
  • - Suitable for selected 4-stroke outboard engines.
  • - Ideal for carburettor servicing and repairs.
  • - Replaces a damaged or obstructed original jet without purchasing a complete carburettor.

Specifications & Dimensions

  • - Manufacturer: Tohatsu
  • - OEM Part Number: 3R1-03254-0
  • - OEM Ordering Number: 3R1032540M
  • - Product Type: Carburettor Slow Jet / Pilot Jet
  • - OEM Description: Slow Jet #38
  • - Jet Size: #38
  • - Installation Location: Carburettor low-speed fuel circuit
  • - Engine Type: 4-stroke

Compatible Tohatsu Outboards

  • 4-Stroke – MFS2.5 Series
  • - MFS2.5B – 2.5HP: Selected carburettor configurations listed by OEM parts distributors.
  • The exact carburettor variant should be checked before ordering.
  • 4-Stroke – MFS4 / MFS5 / MFS6 B Series
  • - MFS5B – 5HP
  • - MFS6B – 6HP
  • - MFS4B – 4HP: Some earlier variants only; the factory catalogue specifies a different #35 slow jet for certain MFS4B configurations.
  • The B-series factory parts catalogue identifies #38 for the 5HP and 6HP carburettors, while distinguishing the 4HP jet.
  • 4-Stroke – MFS4 / MFS5 / MFS6 C Series
  • - MFS4C – 4HP
  • - MFS5C – 5HP
  • - MFS6C – 6HP
  • 4-Stroke – MFS4 / MFS5 / MFS6 D Series
  • - MFS4D – 4HP
  • - MFS5D – 5HP
  • - MFS6D – 6HP

Cross-Reference & Replacement Part Numbers

  • Tohatsu OEM
  • - 3R1-03254-0 – Original OEM slow jet #38.
  • - 3R1032540M – Current OEM ordering number.
  • - 3R1032540 – Compact reference used in parts listings.

Signs the Carburettor Slow Jet Needs Replacing

  • - Rough Idling: Engine idles unevenly or struggles to maintain a consistent idle speed.
  • - Engine Stalling: Motor stalls at idle or when returning to low throttle.
  • - Difficult Starting: Restricted fuel flow contributes to starting difficulties.
  • - Poor Initial Acceleration: Engine hesitates when opening the throttle.
  • - Blocked Fuel Passage: Varnish, dirt or fuel deposits obstruct the slow jet.
  • - Damaged Jet Orifice: Incorrect cleaning or physical damage has altered the calibrated opening.
  • - Corrosion or Contamination: Jet is deteriorated or cannot be cleaned effectively.
  • - Incorrect Jet Size: A previously installed jet does not match the specified carburettor configuration.
  • These symptoms can also be caused by stale fuel, blocked passages, air leaks or other carburettor faults.

Important Fitment Information

  • - Confirm the engine model, serial number and carburettor assembly before ordering.
  • - Jet size #38 is not interchangeable with #35 or #45 simply because the parts look similar.
  • - Different horsepower ratings and regional carburettor configurations may use different slow jets.
  • - Use the factory-specified jet size rather than modifying or drilling the original.
  • - Clean the carburettor and associated fuel passages when replacing a blocked jet.
  • - Avoid using hard steel wire or drill bits to clear the calibrated opening.
  • - Inspect the float valve, chamber and gaskets during servicing.
  • - This product is an individual slow jet, not a complete carburettor repair kit.

Shipping

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