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Check the torque of every bolt
Tighten head nuts (in cross order) with a Torque Wrench at 2.2 Kg.m (22Nm)
Check the tension and condition of the reduction belt
Check fuel lines
Check the wiring
Check that the cord of the starter has no abrasions
Grease the link-sphere between the manifold and the exhaust pipe with lubricating copper-grease
suitable for high temperature (up to 1100°). If you can’t find it on the market, please ask your dealer.
Every 50 hours:
Same controls of the 20 hours and furthermore:
Check the torque of the engine’s crankcase nuts
Change spark plugs
Change the petals of the reed valve
Check the reduction belt and the play of the pulley and change them in case of need
Check the conditions of the starter gears (version with electric start)
Once a year (independently from flight hours) change the diaphragm of the carburetor.
Refer to the CORS-AIR M 25 Y Manual for more information.
12.8 Thor 250 Engine Maintenance
Before each flight:
Check the exhaust system condition
Check the electric wiring condition
Check fuel line condition
Check the bolts and screws tightening
Check the silent-block conditions
After the first 10 hours:
Replace the gear oil
Check the carburetion
Every 50 hours:
Replace spark plug (use Champion RN2C plugs)
Clean the air filter
Replace the gear oil
Check the starter wearing
Every year or every 100 hours:
Replace the air filter
Clean the carburetor
Replace the silent-block
Replace the fuel system pipes
Every 100 hours:
Replace muffler springs
Check the reed valve
Check the piston, the piston rings and the small end bearing
Decarbonize and clean the decompression hole
Every 150 hours:
Remove the gear and check the clutch and bell wear
Replace the piston, the piston rings and the small end bearing
replace the silencer deadening material
Replace the reed valve
Every 300 hours:
Replace all the bearings and seals
Replace the crankshaft
Replace the cylinder
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