Valve Train - Honda Motorcycle Service Manual

CYLINDER HEAD
VALVE TRAIN
The current valve train designs used on four-stroke engines are divided into 3 types: a conventional chain drive, a belt drive
(with considerable noise reduction), and a gear drive for high performance engines.
A chain drive is the most commonly used mechanism for current valve train design. Its simple construction allows for lower
manufacturing costs. Some maintenance is required, however, because eventually chain elongation increases chain noise.
Chain maintenance is not required with types using an"automatic cam chain tensioner': The automatic cam chain tensioner
provides spring support by pressing the chain in the direction of tension and locking against any counter-pressure. This
provides the automatic elimination of chain slack.
3PPER WEDGE
CHAIN
' P ER WEDGE
The GOLDWINGS adopt a belt drive syetem similar to that used on Honda automobiles. This type is used on engines requiring
less noise.
There are also models adopting valve drive by gear. This type has minimal friction loss from valve drive and maintains accurate
valve timing even at high engine speeds. Accordingly, this type is adopted for sport machines. The camshaft drive gear
mechanism beween the crankshaft and the camshaft is of a cassette type, allowing easier rnounting/removal of the camshaft
and gear case in comparison to the chain drive.
Both belt drive and gear drive types require no maintenance and provide rdiahls strength and durability.
CAMSHAFT DRIVE BELT
I
REAR CYLINDER
REAR FXHAUST CAMSHAFT
INTAKE CAMSHAFT
1
FRONT CYLINDER
\ \
FRONT CYLINDER
EXHAUST CAMSHAFT
CAMSHAFT
Date of issue. March, 1995
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