Everyone knows how sensitive an engine is to pilot jets in the acceleration stages from 1000 to 3500 rpm and getting fuel mixture right in this area is critical. For this reason jets have to be perfectly accurate in their marked size and incremental size steps. A-BAX Precision Engineering (sister company of EBC Brakes) pilot jets are precise, clearly marked and reliably gauged using pin gauges, and are accurate to one tenth of a thousandth of an inch.