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The Champion Aerospace 2500A is a precision gap-setting tool for all massive-electrode Champion spark plugs. This tool allows simultaneous adjustment of two opposing prongs without removing the spacing gauge. The 2500A is designed for permanent installation on a bench or a heavy wooden board.
The Gap Setting Tool comes complete with the following accessories and gauges (along with instructions for use):
- GT-1-17L – Spacing Gauge – .015" to .019" (0.4 to 0.5 mm) (Qty. 10)
- GT-1-27 – Spacing Gauge Handle Assembly (Qty. 1)
This unit comes packed individually and partially assembled.
Specifications
- Dimensions: 6" x 5.5" x 6" (15.2 x 13.9 x 15.2 cm)
- Handle Size: 9.5" (24.1 cm) long
- Shipping Weight: 5.5 lbs (2.5 kg)
| General Information | |
|---|---|
| Part # | 2500A |
| Manufacturer | Champion |
| Shipping Information | |
|---|---|
| Schedule B | 8205599000 |
| HTS | 8205599000 |
| ECCN | EAR99 |
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AIRCRAFT COMPATIBILITY
| Compatible Aircraft* |
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QUESTIONS & ANSWERS
The Champion 2500A is a precision bench-mounted gap-setting tool engineered specifically for massive-electrode aviation spark plugs. Its primary function is to accurately adjust the electrode gap on Champion spark plugs to manufacturer specifications, ensuring reliable ignition and optimal engine performance. Unlike handheld tools, the 2500A is designed for permanent installation on a workbench or heavy wooden board, making it ideal for shop environments where spark plug servicing is performed regularly and consistently.
The Champion 2500A is compatible with all massive-electrode Champion aviation spark plugs, including both four-electrode N-type and two-electrode E-type designs. It is not intended for use with fine-wire (iridium) spark plugs, which require a dedicated fine-wire gap-setting tool such as the Champion CT-457. When gapping N-type plugs, the process is performed twice – with the plug rotated 90 degrees between adjustments – to address all four electrode pairs.
The 2500A's standout feature is its ability to simultaneously adjust two opposing electrodes in a single lever movement, eliminating the need for multiple individual adjustments. This simultaneous dual-electrode adjustment significantly speeds up the gapping process compared to tools that address one electrode at a time, making the 2500A especially efficient in busy maintenance shops or FBOs that regularly service large numbers of aircraft spark plugs. The bench-mounted design further enhances throughput by providing a stable, repeatable working position for each plug.
The included gauges cover the .015" to .019" range, which encompasses the most common electrode gap specifications for general aviation piston engines. Champion recommends gapping to the same specifications as new spark plugs; over time, electrode wear causes the gap to widen, increasing the voltage required to fire the plug and eventually reducing ignition reliability. A gap that is too large can cause misfires, rough engine operation, and increased magneto stress, while a gap that is too small can result in excessive current flow and premature electrode erosion.
The most critical rule in spark plug gap setting is to never bend or apply pressure to the center electrode – doing so risks fracturing the ceramic insulator, which renders the plug unserviceable. Pressure should be applied only to the ground electrodes, using the tool's adjusting lever rather than a feeler gauge. All aircraft spark plugs should be thoroughly cleaned before gapping, as deposits on the electrode surfaces can affect gap measurement accuracy and cause the spacing gauge to seat improperly.
The 2500A requires minimal maintenance but should be kept clean and lubricated regularly to perform at its best. The adjusting levers and fingers should be lubricated periodically with light machine oil, and the upper collet bushing and frame collet bearing surface should be cleaned and lubricated with a light grease or Champion 2612 Thread Lubricant. It is important that the collet float freely within the frame at all times, and the tool should be covered when not in use to prevent dust and debris from accumulating in the mechanism.
