Beta Enduro RR 390 2015 User Manual

Details on disassembling the cylinder head cover, gaskets, and spark plug gasket.

Disassembly of ignition unit, timing chain, and guides.

Procedure for removing the outer and inner clutch covers and the water pump cover.

Instructions for removing screws to open the left and right crankcase halves.

Instructions for extracting fork support pins and disengaging control forks from the desmodromic device.

Checking piston for damage, measuring its diameter, and checking piston ring and oil-scraper ring wear limits.

Checking cylinder bore for service limits and ovalization, and calculating cylinder-piston coupling play.

Disassembling and inspecting the cylinder head, including oil jets and centring pins.

Disassembling and checking valve units, including half-cones, cup, spring, and valve.

Checking valve guides for scratches, measuring their diameter, and checking valve stems.

Checking cylinder head flatness, sliding zones for camshafts, and cleaning oil passages.

Checking camshafts for wear, meshing traces, and abnormal colouring, and measuring cam wear limit.

Repositioning calibrated discs, assembling finger follower shafts and followers, and coupling the spark plug.

Applying piston rings and oil-scraper rings to the piston, ensuring correct positioning and alignment.

Preparing the ring compression band and applying the piston to the cylinder with its rings.

Applying piston-cylinder gasket, centring bushes, and coupling the piston/cylinder unit to the connecting rod.

Applying guide bushes and gasket, introducing timing chain, and tightening cylinder head screws in stages.

Coupling bearings to camshafts, lubricating them, inserting exhaust camshaft, and positioning for phasing.