Compatibility with 14mm Colortune and Hi-Gauge

The Gunson G4055B adapter is specially designed to use your 14mm Gunson Colortune spark plug or Hi-Gauge compression tester on engines with 12mm spark plugs. This allows you to make your existing tools more versatile without extra investment.

Ideal for classic motorcycles and two-stroke engines

This adapter is particularly suitable for classic motorcycles and two-stroke engines, which are often equipped with 12mm spark plugs. Thanks to the G4055B, you can easily check the combustion and compression of these engines with your trusted Gunson tools.

Easy installation and secure sealing

The set includes:

• 14mm to 12mm thread adapter
• Soft copper sealing ring

Installation is simple: screw the adapter with the copper ring into the 12mm spark plug hole and then attach your 14mm Colortune or Hi-Gauge to the adapter. The copper ring ensures a reliable seal, which is essential for accurate measurements.

Important points to note

• The G4055B adapter is only compatible with the 14mm Colortune and Hi-Gauge models. It does not fit the 10mm or 12mm versions.
• The adapter can be tightened with a 19mm or 3/4" wrench.
• The Colortune spark plug or Hi-Gauge compression tester is not included in this set.

Technical specifications

• Item number: G4055B
• Thread size: 14mm to 12mm
• Suitable for: classic motorcycles and two-stroke engines
• Set contents: adapter and copper sealing ring

With the Gunson G4055B adapter, you expand the functionality of your existing Gunson tools, allowing you to make accurate diagnoses on a wider range of engines.