25AX Cylinder Heatsink Head - O.S. Engine OS22514000  [OS22514000]

Cylinder head with fins for 25AX engines

This heatsink head is offered as a direct replacement for O.S. Engine 25AX cylinder heads. The finned profile increases cooling surface and aids in transferring heat away from the combustion area to stabilise temperatures.

Installation is straightforward for those familiar with glow engines: remove the existing head, clean mating surfaces of oil and debris, replace the gasket if worn, and tighten the head bolts evenly in stages. Avoid overtightening and ensure the head sits true before final torqueing.

For tuning and upkeep, the head's improved heat dispersion can reduce temperature-related shifts in mixture and idle, making repeatable tuning easier. Regular inspection of the head and mating surfaces will help retain consistent performance.