Webe Idle Jet 65, for IDF & HPMX

EMPI Weber Idle Jet 65 for IDF & HPMX Carburetors

VW Fitment & Compatibility

This size 65 idle jet is a precision-calibrated component designed for Weber IDF and EMPI HPMX series carburetors. It is a standard tuning part for air-cooled Volkswagen engines, including the Type 1 Beetle, Karmann Ghia, Type 2 Bus, and Type 3. This specific jet size is frequently used in dual-carburetor setups on larger displacement engines (1776cc to 2110cc+) or engines with performance camshafts to ensure a smooth fuel delivery transition.

Pro Tech Tips for Carburetor Tuning

Bridge the Transition Gap: The idle jet is responsible for more than just the engine at a standstill; it controls the fuel mixture from idle up to roughly 2,5003,000 RPM. If your VW experiences a "flat spot" or hesitation as you begin to accelerate, moving to a larger .65 jet can often provide the extra fuel needed to bridge the gap between the idle circuit and the main high-speed circuit.

Maintain Precision Cleaning: The orifice in a 65 jet is exactly 0.65mm. Never use a metal wire or a welding tip cleaner to clear a blockage, as the hardened metal will gouge the soft brass and permanently change the flow rate. Always use pressurized air and aerosol carburetor cleaner to clear debris without damaging the jet's calibration.

Verify Vacuum Integrity: Before increasing your idle jet size to solve a lean "popping" sound through the carburetors, check for vacuum leaks at the intake manifold gaskets and carburetor bases. A vacuum leak will lean out the mixture regardless of jet size; ensuring a tight seal first prevents you from over-jetting and wasting fuel on a poorly sealed engine.