377
The air lter of the GX21 engine is concealed inside the driver’s helmet. To open the two half-shells
of the helmet so that the air lter can be reached, you have to cut through the two decorative
stickers on the front section of the helmet because they cross the join. It is best to do this with a
sharp craft knife or cutter. The pieces concerned are the sticker on the helmet visor and the one
that extends across the chinguard of the helmet. The Red Bull logo on the visor is already made of
two halves so it does not need to be divided. Position the tip of the blade at the top edge of the
visor and slide it carefully downwards.
After cutting the two stickers on the front of the helmet, the half-shells of the helmet can be pulled
apart enough to allow the air lter to be removed from its holder. To do this, loosen the top cover of
the lter by undoing the screw in the centre with a size 1 Phillips screwdriver. Now you can pull the
dirty foam lter element from the base of the lter. Wear gloves when doing this – the dirt particles
could lead to skin irritation.
After a further rinse with nitro fuel, place the lter element on an absorbent, lint-free piece of cloth
or on kitchen paper. Fold the absorbent material over the element, and squeeze the foam-rubber
cylinder thoroughly between the two layers of cloth or paper. Now rub the material gently over the
lter surface, so that it picks up any dust particles remaining in the foam after the rinsing process.
Hold the element up to the light to check the progress of the cleaning. If necessary, repeat the
rinsing and drying procedure until all the oil and dirt has been removed.
To clean the lter element, put it in a small container, such as the lid of a spray can. Drip nitro fuel
onto the element until it is saturated. (Again, wear gloves when doing this.) The fuel will dissolve
the old air lter oil and loosen any dirt residues that have built up in the pores of the element.
Vigorously squeeze the fuel-soaked element several times with your ngers (wearing gloves!) to
distribute the fuel throughout the foam. This process will remove the coarse dirt particles trapped
in the element, and they will settle on the bottom of the container.
To ensure the optimum performance of the ne-pored foam lter, you should soak it with air lter
oil after cleaning. This air lter oil is available in model shops and online, and its thick consistency
ensures that even the nest dust particles are retained. Put a few drops on the lter insert and
knead it well to work the oil into the pores. Now you can reassemble the air lter and t it back in
place between the half-shells of the driver’s helmet. For more information about the air lter and
detailed instructions for tting it, see Stage 78.
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