A greater proportion of the English Service Manuals has been published in the Members Area, but not the full manuals. The full manuals are only available as a "hard copy" for purchase.
The engine mounting bolts should just slide out, so they are probably just a little corroded, and stuck in place. Don't forget the torque link (to the rear of the drive sprocket) when dropping the motor, and removing the oil pump and coolant "splitter" union at the front of the transmission cover makes removal/refitting easier* too. The large allen "grub" screw (12mm internal hex) should be wound out at least flush with the frame, to give the most room to manoeuvre the motor in and out of position.
*Be warned, the plastic coolant union is a pig to refit once the motor's back in... a real catch 22 situation. Refitting the motor with the plastic union already attached takes some real jockeying, but fitting it without it attached sees the motor almost fall into place. You choose to eaither struggle to fit the motor, or struggle to fit the union! I still don't know which I prefer!
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Andy.
NSR-WORLD.COM
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