Engine System/Features - Yamaha XP500 TMax Technical Manual

ENGINE SYSTEM
Displacing 499 cc, the TMax's highly-advanced fully automatic twin-cylinder DOHC liquid-cooled
4-stroke 8-valve engine is one of the most powerful designs available on scooters today.
A key feature of its configuration is that unlike most traditional scooter engines which pivot as one
unit with the rear suspension, this engine is fixed rigidly into the TMax's strong tubular diamond-shape frame
in order to achieve higher levels of chassis rigidity for enhanced handling performance. The swingarm is
mounted to a pivot point at the rear of the engine, thereby keeping unsprung weight low for more responsive
rear suspension action.
Another innovative feature is the horizontal configuration of the engine that keeps the centre of gravity
low for easy handling and also gives extra storage space under the dual seat.
ENGINE FEATURES
n Parallel twin with 360 degree crankshaft
n 66 mm bore and 73 mm stroke
n 10.1 :1 compression ratio
n Left side drive cam chain for reduced engine width
 Horizontal compact cylinder head
‚ Horizontally opposed reciprocating balancer
ƒ Semi dry sump
„ High capacity V-belt transmission
… Wet multiple plate automatic centrifugal clutch
† Non adjustable 2-stage silent chain drive train
‡ Pivot coaxial drive shaft eliminates chain backlash
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XP500 TMax Technical Orientation Guide
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