Section 08 TECHNICAL SPECIFICATIONS
Subsection 01 (RXT iS 255/GTX LIMITED iS 255)
RXT iS 255/GTX LIMITED iS 255
MODEL RXT iS 255 GTX LIMITED iS 255
ENGINE
Engine type ROTAX 1503 4-TEC, 4-stroke, Single Over Head Camshaft (SOHC)
Induction Supercharged intercooled
Number of cylinders
3
Number of valves 12 valves with hydraulic lifters (no adjustment)
Standard 100 mm (3.9 in)
Bore
1
st
Oversize 100.25 mm (3.95 in)
Stroke 63.4 mm (2.5 in)
Displacement 1 493.8 cm³ (91 in³)
Compression ratio
8.4:1
Maximum HP 8000 RPM
Type Dry sump (2 oil pumps). Replaceable oil filter. Water-cooled oil cooler
Oil type
XPS summer grade oil (P/N 293 600 121). Refer to
LUBRICATI
ON
subsection
Lubricati
on
Capacity
3 L (3.2 qt (
U.S. liq.)) oil change w/filter
4.5 L (4.8 qt (U.S. liq.)) total
Intake valve opening 0° BTDC
Intake valve closing 50° ABDC
Exhaust valve opening 50° BBDC
Exhaust valve closing 0° ATDC
New 5.961 mm to 5.975 mm (.2347 in to .2352 in)
Intake
Wear limit 5.930mm (.233 in)
New 5.946 mm to 5.960 mm (.2341 in to .2346 in)
Valve stem diameter
Exhaust
Wear limit 5.930mm (.233 in)
New 5.990 mm to 6.010 mm (.2358 in to .2366 in)
Valve guide diameter
Wear limit 6.060 mm (.2386 in)
New 41.02 mm (1.615 in)
Inner
Wear limit 38.80 mm (1.528 in)
New 45.45 mm (1.789 in)
Valve spring free
length
Outer
Wear limit 43.00 mm (1.693 in)
New 1.10 mm to 1.30 mm (.043 in to .051 in)
Intake
Wear limit 1.60 mm (.063 in)
New 1.25 mm to 1.55 mm (.049 in to .061 in)
Valve seat contact
width
Exhaust
Wear limit 1.80 mm (.071 in)
New 20.000 mm to 20.020 mm (.7874 in to .7882 in)
Rocker arm inner diameter
Wear limit 20.030 mm (.7886 in)
New 19.980 mm to 19.990 mm (.7866 in to .787 in)
Rocker arm shaft diameter
Wear limit 19.960 mm (.7858 in)
Cylinder head maximum warpage Service limit 0.15 mm (.006 in)
smr2009-044 511
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