A vintage example of the well-known Gunson's Colortune 500 fuel mixture tester for a single spark plug. ___________________________________ SERIOUS NOTE:- This kit is intended for use on PETROL ENGINES with a CARBURETTOR.
It is NOT for FUEL-INJECTION engines with or without digital management systems.
ALWAYS consult the vehicle manufacturer's MANUAL BEFORE making any changes or adjustments. ------------------------------------------ The tray contains the full kit minus the cleaning brush and the fluid, although the bottle is present and may be refilled with any acetone or alcohol that can remove dirt and combustion deposits from the see-through spark plug.
This kit consists of: See-through spark plug HT lead extender/adapter Sight tube with "periscope" mirror Bottle for cleaning fluid
Also present, in the box beneath the tray, are the comprehensive original instructions and additional information sheets from the manufacturer.
In brief, the see-through spark plug is installed in the engine in place of the usual spark plug. The sight tube sits on top with the HT extender lead passing out through the slot. The engine is run and the periscope mirror is adjusted to see the fuel being burnt in the cylinder. The colour of the flame is compared to the chart, and the fuel/air ratio is then adjusted as needed to achieve the most efficient "burn".
Postage costs shown are for UK buyers only. Overseas shipping charges will vary. Free local collection is available.