Weber

Carburetor Main Jet (Select Size) — Weber IDF/IDA/DCOE & EMPI HPMX

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$5.91
Product details
  • Vendor Weber
  • SKU 43-5301-21
  • Fits
    • 1948-1965|Porsche|356
    • 1965-1969|Porsche|912
    • 1969-1976|Porsche|914

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Carburetor Main Jet (Select Size) — Weber IDF/IDA/DCOE & EMPI HPMX (Weber 43-5301-21)

Replacement main jet for the high-speed fuel circuit on Weber IDF/IDA/DCOE and EMPI HPMX carburetors. Main jets set fuel delivery at cruise and wide-open throttle — essential for dialing in a fresh dual-carb setup.

Vehicle Fitment

  • Porsche 356: All years (with Weber/EMPI IDF/IDA/DCOE-style carbs)
  • Porsche 912: 1965–1969 (with Weber/EMPI IDF/IDA/DCOE-style carbs)
  • Porsche 914: 1969–1976 (with Weber/EMPI IDF/IDA/DCOE-style carbs)

Key Features & Benefits

  • Select-size ordering: Available in sizes 110–210 to fine-tune your high-speed circuit.
  • Broad compatibility: Fits Weber IDF/IDA/DCOE and EMPI HPMX carburetor bodies.
  • Genuine Weber jet: Precision-drilled for consistent, repeatable fuel metering.

Technical Specifications

  • Type: Main jet, sizes 110–210
  • Fits: Weber IDF/IDA/DCOE, EMPI HPMX carburetors
  • Brand: Weber
  • Part Number: 43-5301-21

Frequently Asked Questions

  • How do I know what size I need? Main jet sizing depends on engine displacement, cam, and target A/F ratio at wide-open throttle — start from your carb manufacturer's baseline chart and adjust with plug reads or a wideband.
  • Does this fit my carb? It fits the main jet holder on Weber IDF/IDA/DCOE and EMPI HPMX carburetors — confirm your carb model before ordering.

Explore Related Categories

Carburetors · Fuel System · Porsche 356

Prop 65 Warning

WARNING: This product can expose you to chemicals known to the State of California to cause cancer and reproductive harm. For more information, go to www.P65Warnings.ca.gov.