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Product details
The EMPI 43-5514-0 is a .52 idle jet for Weber 40, 44, and 48 IDF, Weber DCNF, and EMPI 40 and 44 HPMX carburetors, and it is the idle jet EMPI installs at the factory in its dual 40mm HPMX carbs. The idle jet meters fuel for idle and for the progression circuit that carries the engine off idle, and a larger number flows more fuel. In EMPI's 74405 series it sits between the .50 and the .55.
From there, the .50 leans the idle circuit and the .55 or .57 richens it. EMPI sizes the 40mm HPMX for engines up to 2000cc and the 44mm for 2100cc and up, and the dual 44mm carb ships with .55 idle jets instead.
Technical Details
- Manufacturer: EMPI
- Manufacturer part number: 43-5514-0
- Size: .52
- Factory fit: EMPI 40mm HPMX dual carb (47-1010-0)
- Sold as: each
- UPC: 707924224122
Fitment & Compatibility
EMPI lists the jet for 40/44 HPMX, 40/44/48 IDF, and DCNF carburetors. PMO also lists 43-5514-0 in its idle jet chart for PMO Induction carbs. EMPI jets its single-carb HPMX versions with .60 idle jets, so check which version you have.
Installation & Tuning Notes
Set the idle circuit before touching the main and air corrector jets. Then read the mixture screws. Screws backed far out for a smooth idle point to an idle jet that is too small, and screws barely open point to one that is too large.
Common Questions
What idle jet comes in a stock EMPI 40 HPMX?
EMPI jets its dual 40mm HPMX carbs with .52 idle jets and its single 40mm version with .60s.
Is a .52 leaner than a .55?
Yes. A smaller number flows less fuel, so the .52 runs the idle circuit leaner than a .55.
