Section 17 TECHNICAL DATA
Subsection 05 (GTX 4-TEC MODELS)
GTX 4-TEC MODELS
ENGINE GTX 4-TEC GTX 4-TEC SUPERCHARGED
Engine type
BOMBARDIER-ROTAX 1503 4-TEC, 4-stroke, Single Over
Head Camshaft (SOHC), liquid cooled
Number of cylinders 3
Number of valves 12 valves with hydraulic lifters (no adjustment)
Bore Standard 100 mm (3.9 in)
Stroke 63.4 mm (2.49 in)
Displacement 1493.8 mm (58.81 in)
Compression ratio
10.6:1 8.1:1
Induction type Normally-aspirated
Mechanically-driven
supercharger
Maximum HP RPM 7650 ± 50 RPM 7500 ± 50 RPM
Type
Dry sump (2 oil pumps). Replaceable oil filter.
Water-cooled oil cooler.
Lubrication
Oil type
Bombardier 4-stroke
engine oil SAE 10W40
(API service classification
SL, SJ or SH)
Bombardier 4-stroke engine
oil SAE 10W40
Oil filter
Bombardier
Exhaust system Type Water cooled/water injected. Direct flow from propulsion unit
Intake valve opening 10° BTDC
Intake valve closing 45° ABDC
Exhaust valve opening
50° BBDC
Exhaust valve closing
5° ATDC 0° ATDC
Starting system
Electric start
Minimum (new) 5.961 mm (.2347 in)
Maximum (new) 5.975 mm (.2352 in)Intake
Wear limit 5.930 mm (.2330 in)
Minimum (new) 5.946 mm (.2341 in)
Maximum (new) 5.960 mm (.2346 in)
Valve stem diameter
Exhaust
Wear limit 5.930 mm (.2330 in)
Minimum (new) 5.99 mm (.2358 in)
Maximum (new) 6.01 mm (.2366 in)Valve guide diameter
Wear limit 6.060 mm (.2386 in)
Nominal (new) 41.02 mm (1.615 in)
Inner
Wear limit 38.8 mm (1.499 in)
Nominal (new) 45.45 mm (1.789 in)
Valve spring free length
Outer
Wear limit 43 mm (1.693 in)
Nominal (new) 1.1 to 1.3 mm (.043 to .051 in)
Intake
Wear limit 1.6 mm (.063 in)
Nominal (new) 1.25 to 1.55 mm (.049 to .061 in)
Valve seat contact width
Exhaust
Wear limit 1.8 mm (.071 in)
Minimum (new) 20.00 mm (.7874 in)
Maximum (new) 20.02 mm (.7882 in)Rocker arm bore diameter
Wear limit 20.03 mm (.7886 in)
Minimum (new) 19.98 mm (.7866 in)
Maximum (new) 19.99 mm (.7870 in)Rocker arm shaft diameter
Wear limit 19.96 mm (.7858 in)
Cylinder head screw Service limit
148.5 mm (5.846 in)
smr2004-Complete Line Up 781
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