Rotax break in, Rotax engine break in, Rotax engine break in procedure.

Before you set about breaking in your new or rebuilt engine you should first have it set up correctly, and the engine loaded properly.
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All new and rebuilt Rotax aircraft engines should be put through the standard Rotax break in procedure, to ensure proper seating of rings, cylinders, pistons etc. This break in requires that you have an accurate tachometer, and engine heat gauges, including exhaust gas temperature gauges for each cylinder, and a water temp gauge for liquid cooled engines.
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Where it is not possible to supply enough air flow to the radiator to maintain a constant temperature (such as in the case of a Rans S12) it is recommended that a garden hose be used  to run a flow of water over the rad to keep the temperature between 140 and 180 degrees F.
When breaking the engine use ear protection.
Always have an assistant to direct people, pets etc.  away from the craft.

Maximum engine rpm for 
277/337/447/503/532/582 is 6800 rpm  
618 is 7,000 rpm

This limits are controlled by YOUR props pitch - during break in set your prop up for these limits. Once finished with the break in RESET your prop to give approximately 300 rpm less than these values.

Rotax aircraft engine break in procedure.

All Rotax 2-cycle engines require break-in from the factory and when new pistons and/or rings are installed to insure proper seating and cylinder/piston wear. Be sure that the engine is properly installed on the aircraft and has proper loading (propeller installed with correct pitch) to insure that you do not exceed max recommended rpm*.

Static testing (aircraft tied down properly) is recommended for break-in, however, some free-air cowled installations required either taxiing, flying or a hose with running water cooling the radiator in the case of a liquid cooled engine.

Watch your engine temperatures and if you must stop during break-in, begin at the spot at which you stopped.

Cylinder heads on air-cooled engines must be re-torqued after break-in when engine is COLD

CYLINDER HEAD TORQUING

Torque cylinder head nuts following illustrated sequence when the intake/exhaust manifolds are in place to ensure proper alignment.

ENGINE MUST BE COLD FOR THIS PROCEDURE.

Use a cross-sequence for tightening the nuts. Consider both cylinders as one unit because they are joined by exhaust and intake manifolds. Torque spec for cylinder head nuts (8mm) = 22NM/195 in lb. Requires 13mm socket.

The fan belt tension on air cooled engines should also be checked.
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Flying on floats - some things you should consider. Click here for more information.

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