EMPI 1.55 Main Jet for HPMX/IDF/IDA/DCOE Carburetors — 1.55mm metering orifice | Porsche 914 (1970-1976) (43-5310-0)
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EMPI 1.55 Main Jet (43-5310-0) for 40/44 HPMX, IDF, IDA & DCOE Carburetors
The EMPI 43-5310-0 is a genuine 1.55 main jet with a 1.55mm calibrated brass orifice that meters fuel at high rpm and wide-open throttle. It threads into EMPI 40/44 HPMX, Weber 40/44/48 IDF, EPC 48/51, 48 IDA and DCO/DCOE carburetors on air-cooled engines, including the 1970-1976 Porsche 914. Sold as one threaded brass jet that swaps with a flat screwdriver.
Part numbers: EMPI 43-5310-0 / 4353100 / 43 5310 0 · 1.55 main jet
Fitment
| Years | Vehicle | Notes |
|---|---|---|
| 1970–1976 | Porsche 914 | With EMPI 40/44 HPMX, Weber 40/44/48 IDF, EPC 48/51, 48 IDA or DCO/DCOE carburetors |
| — | Air-cooled engines | Any engine running one of the carburetors above |
If you are unsure this fits your car, contact us with your year and model before ordering.
Specifications
| Spec | Detail |
|---|---|
| Part number | 43-5310-0 |
| Manufacturer | EMPI |
| Jet size | 1.55 |
| Orifice | 1.55mm calibrated orifice |
| Material | Brass, threaded |
| Circuit | Main jet: meters fuel at high rpm and wide-open throttle |
| Carburetors | EMPI 40/44 HPMX, Weber 40/44/48 IDF, EPC 48/51, 48 IDA and DCO/DCOE |
| Place in the range | One increment richer than the 1.50 |
| Tool | Flat screwdriver |
| Boxed dimensions | 2 x 1 x 1 in |
| Shipping weight | 0.022 lb |
| Ships from | Orange, California |
Why It Matters
A race-leaning 48 IDF or IDA drinks in a way street carbs never do, and the mixture wants watching at wide-open. One step richer than the 1.50, the 1.55 main jet supplies that fuel through a 1.55mm brass orifice; jet down if the plugs come back sooty.
The main jet sets the wide-open mixture, so stepping one size at a time is how a larger Weber or HPMX setup gets dialed in. The 1.55 is one step richer than the 1.50; jet down if the plugs come back sooty.
Installation Notes
The 1.55 is a threaded brass jet that swaps with a flat screwdriver. Fit it in place of the existing main jet in your 40/44 HPMX, IDF, IDA or DCOE carburetor.
Frequently Asked Questions
What carburetors does the EMPI 1.55 main jet fit?
The EMPI 43-5310-0 1.55 main jet threads into EMPI 40/44 HPMX, Weber 40/44/48 IDF, EPC 48/51, 48 IDA and DCO/DCOE carburetors on air-cooled engines.
Does the EMPI 43-5310-0 main jet fit a Porsche 914?
Yes. It fits the 1970-1976 Porsche 914 when it runs EMPI 40/44 HPMX, Weber 40/44/48 IDF, EPC 48/51, 48 IDA or DCO/DCOE carburetors.
What size orifice is a 1.55 main jet?
A 1.55 main jet has a 1.55mm calibrated brass orifice. EMPI part number 43-5310-0.
What does a main jet do on a Weber IDF or HPMX carburetor?
The main jet is a calibrated brass orifice that meters fuel at high rpm and wide-open throttle. Changing its size richens or leans the wide-open mixture.
When should I use a 1.55 main jet?
The 1.55 is one step richer than the 1.50; jet down if the plugs come back sooty.
How do I change the main jet in an IDF or HPMX?
The EMPI main jet is a threaded brass jet that swaps with a flat screwdriver.
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⚠ California Proposition 65 Warning: This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
