Intake Silencer; Exhaust System; Media For Engine Operation; Coolant - Bombardier-Rotax FR 125 MAX FR 125 Junior MAX Installation And Operator's Manual

Operating Instructions FR 125 MAX, FR 125 Junior MAX and FR 125 Mini MAX

2.9. Intake silencer

The intake silencer incorporates an air filter to clean the intake air. The intake silencer has been
designed for optimum reduction of the air intake noise level and represents a tuned system with
the engine.

2.10. Exhaust system

The exhaust system is designed as resonance system with an after-muffler and represents a tuned
system with engine.
At the engine Type FR 125 Mini MAX the performance characteristic gets adapted to the age of
drivers by use of an exhaust socket with integrated restrictor (Rotax part no.: 273 792).

3. Media for engine operation

3.1. Coolant

A mixture of plane water and aluminium-compatible antifreeze has to be used for the coolant.
Follow the antifreeze specifications to ensure protection against freezing to a temperature of
-20°C.
Note: Follow the national regulations regarding use of antifreeze on race tracks.
Open radiator cap and fill the system with coolant (approx. 0,7 litre for the complete
cooling system).
Close radiator cap.
Note: With the standard location of the radiator, venting of the cooling system is not
required.

3.2. Battery and battery charging unit

Power for the ignition unit and electric starter is only supplied from the battery. With a fully charged
battery of 12 V and 7,2 Ah the engine can be started approximately one hundred times and
operated over a period of approximately five hours. With the battery voltage decreasing to
approximately 11 V the point will be reached when the battery voltage is too low to generate a
spark for ignition.
For perfect performance we recommend to use batteries of the brand
TYPE FG20722 or FGHL20722 (with longer life span)
Attention: The life span of the battery will be drastically reduced by exhausting the battery
completely. Therefore it is recommended to fully re-charge the battery before and
after any operation of the kart.
Note: It is recommended to always carry a charged spare battery. The installed battery
should be replaced by a fully charged battery before it is completely exhausted.
Note: If the spark plug will be removed, to check if the battery still generates a spark,
consider the following: with the spark plug removed it is easier for the electric starter
to crank the engine, which reduces current absorption of the electric starter resulting
Seite/page 77/108 Ausgabe/edition 09.2003