Section 05
TECHNICAL DATA
Sub-Section 01
(GSX AND GTX MODELS)
05-01-1
GSX AND GTX MODELS
1
ENGINE
GSX (5620)
GTX (5640)
Engine type
Bombardier-Rotax 787
Induction type
Rotary valve
Exhaust system
Type
Water cooled, water injected with regulator
Water injection fitting (head)
3.5 mm
(.139 in)
Water injection fitting (cone)
Not applicable
Water injection fitting (muf-
fler)
3.5 mm
(.139 in)
Exhaust valve
Rotax Adjustable
Variable Exhaust (RAVE)
Starting system
Electric start
Lubrication
Fuel / oil mixture
VROI (Variable Rate Oil Injection)
Oil injection pump
Direct driven
Oil type
Formula XP-S synthetic
injection oil
Number of cylinders
2
Bore
Standard
82 mm
(3.228 in)
First oversize
82.25 mm
(3.238 in)
Second oversize
Not applicable
Stroke
74 mm (2.99 in)
Displacement
781.6 cm³ (47.7 in³)
Corrected compression ratio
5.9 : 1
Cylinder head warpage (maximum)
0.05 mm
(.002 in)
Piston ring type and quantity
1 Semi-trapez – 1 Rectangular
Ring end gap
New
0.25 - 0.40 mm
(.010 - .016 in)
Wear limit
1.00 mm
(.039 in)
Ring / piston groove
New
0.025 - 0.070 mm
(.001 - .003 in)
Wear limit
0.2 mm
(.008 in)
Piston / cylinder wall
clearance
New
0.060 - 0.108 mm
(.0024 - .0043 in)
Wear limit
0.2 mm
(.008 in)
Cylinder taper (maximum)
0.100 mm
(.004 in)
Cylinder out of round (maximum)
0.080 mm
(.003 in)
Connecting rod big end axial
play
New
0.39 - 0.74 mm
(.015 - .029 in)
Wear limit
1.2 mm
(.047 in)
Crankshaft deflection
MAG side : 0.05 mm (.002 in) ; PTO side : 0.03 mm (.001 in)
Rotary valve timing
Opening
146.5° ± 5 BTDC
Closing
64° ± 5 ATDC
Rotary valve duration
159°
Crankcase / rotary valve gap
0.25 - 0.35 mm
(.010 - .014 in)
Connecting rod / crankshaft
pin radial clearance
New
0.023 - 0.034 mm
(.0009 - .0013 in)
Wear limit
0.050 mm
(.002 in)
Connecting rod / piston pin
radial clearance
New
0.003 - 0.012 mm
(.00012 - .00047 in)
Wear limit
0.015 mm
(.00059 in)
ADDITIONAL INFORMATION : Squish gap : 1.2 - 1.6 mm (.047 - .063 in)
