Aprilia SR50R - Service manual > Engine IE 361

REMOVING THE ENGINE IE 361

• To remove the crankcase, first remove the lower shield, the battery, the fuel tank, the throttle body, keep it connected to the throttle cable and drain the cooling system.
• Using a belt and an A-frame, lift the vehicle rear end.
• Loosen and remove the shock absorber upper screw.

• Loosen and remove the two cable guide screws.

• Loosen and remove the two screws.
• Slide out the rear brake caliper, keep it connected to the fluid line.

• Slide the two intake hoses out of the ties on the frame.

CAUTION Place some paper under the coupling to collect any oil spillage.

• Disconnect the two mixer oil hoses
• Fold the lines and tie them.

• Remove the cooling system hose from the head.

• Disconnect the spark plug cap.

• Remove the rubber plug.

• Open the tab and remove the mixer oil pump control cable.

• Disconnect the fuel injector connector.

• Disconnect the engine temperature sensor connector.

• Disconnect the compressed air injector connector.

• Loosen the screw and remove the two ground cables.

• Disconnect the starter motor positive cable from the relay end.

• Remove the clamp.

• Working on the right side, loosen and remove the nut.

• Working on the left side, remove the pin.
• Remove the engine.

INSTALLING THE ENGINE IE 361

• Move the frame in small motions until the holes match perfectly.
• Working on the left side, fit the pin.

• Working on the right side, tighten the nut.

• Connect the starter motor positive cable to the relay.

• Position the two ground cables and tighten the screw.

• Connect the connector to the compressed air injector.

• Connect the engine temperature sensor connector.

• Connect the connector to the fuel injector.

• Fasten the wiring with a new tie.

• Reposition the mixer oil pump cable in its housing and close the tab.

CAUTION it might be necessary to adjust the mixer oil pump by making the two marks match.

• Fit the spark plug cap.

• Position the cooling system hose onto the head.
• Tighten the clamp.

• Connect the generator connector.

• Fit the cooling system hose to the coolant pump.
• Fasten the hose with the tie.
• Fill and bleed air off the cooling system.

• Connect the two mixer oil hoses

WARNING Before using the vehicle, bleed the mixer oil pump, see (MIXER OIL IE361 - C364) and (MIXER OIL IE50).

• Place the two intake hoses on the frame.

• Fit the rear brake caliper in place.
• Tighten the two screws.

• Reposition the two cable guides of the rear brake fluid hose.
• Tighten the two screws.

• Tighten the shock absorber top screw.
• Fit the throttle body, the fuel tank, the battery, the lower shield.

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