Running-In Procedure For The Engine; Setting Of The Exhaust Valve Timing (125 Max Evo Only) - Rotax 125 MAX evo Installation Instructions And Operation Manual

ROTAX 125 MAX evo, Junior MAX evo, Mini MAX evo, Micro MAX evo
6.3.

Running-in procedure for the engine

 Attention: Pay attention to safety advice of the kart manufacturer.
To ensure that components have the longest possible life span, the engine must be subject to a
defined running-in period at first operation of engine or after a repair of the crankshaft or
displacement parts.
Observe the following issues:
Use a long gear ratio (standard or higher).

A two sizes bigger main jet size based on altitude and temperature (see section

4.1.)
For the first 10 liters of fuel use a mixing ratio of 1:33 (= 3% or 0.3 liter oil per 10

liters fuel).
Make sure that the coolant temperature reaches 45°C (113°F).

Run the kart for 15 minutes at continuously changing load and engine speed

fluctuation up to maximum rotational speed. Maximum rotational speed for max. 2
seconds!
Afterwards reduce the main jet size step by step until standard size is reached.

After this running-in procedure, the full power of the engine may be used.
 Attention: Use only fully synthetic 2-stroke oil. BRP-Powertrain recommends to use XPS
Kart-TEC oil.
6.4.

Setting of the exhaust valve timing (125 MAX evo only)

Due to the principle of equal parts, the harness for all MAX engines is identical. For engines
without ERAVE, the auxiliary cable (pos. 2, fig. 8) must be attached and isolated to the ground
cable so, that a possible contact with the engine ground does not affect the general function.
The opening time of the exhaust valve is setted in the ECU and depends on the engine speed.
However, the ECU allows two different modes of the exhaust valve opening. These can be
selected by connecting an additional cable to the cylinder head cover.
 Attention: The ground wire (pos. 1) must be continuously connected to the cylinder head
cover. This is important for the general function of the engine.
Mode 1:
See Fig. 8.
Additional cable (pos. 2) is NOT attached to the ground wire (pos. 1) on the cylinder head cover.
The control of the exhaust valve timing is activated at 7900 r.p.m.
 Note: Isolate the additional cable (pos. 2) with an electrical/insulating tape to the ground
wire, so that a possible contact with the engine ground does not affect the function.
Seite/page 86/98 Ausgabe/Edition 11/2014