Robin America EX30 Wartungshandbuch PDF herunterladen (Seite 9)

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4-5 PISTON RINGS

The piston rings are made of special cast iron. The proﬁ le of the top ring is a barrel face or tapered face, and that of

the second ring is a tapered face. There are 2 types of oil ring depending on the engine speciﬁ cation.

As those are interchangeable, the cutter ring with coil expander type can be selected as the spare part.

TOP

RING

OIL

RING

BARREL

THREE-PIECE

CONSTRUCTION

4-6 CAMSHAFT

The camshaft and the sprocket are made of special

sintered alloy. They are constructed as a single piece.

The camshaft is provided with intake and exhaust

cam, and the decompression release lever is mounted

on the sprocket shaft end side.

4-7 VALVE ARRANGEMENT

This engine has a chain-driven overhead cam and

overhead valve construction, with a single cam

performing both intake and exhaust operations.

4-8 CYLINDER HEAD

The cylinder head is an aluminum die-casting with

a pent roof combustion chamber construction. The

intake and exhaust ports are arranged in a cross

direction to improve combustion efﬁ ciency.

DECOMPRESSION

RELEASE

LEVER

EXHAUST VALVE INTAKE VALVE

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Robin America EX30 Wartungshandbuch Seite 9