Section 17 TECHNICAL DATA
Subsection 06 (3D RFI MODEL)
3D RFI MODEL
ENGINE 3D RFI
Engine type
BOMBARDIER-ROTAX 787 RFI, 2-stroke
Induction type Rotary valve
Type Water cooled (water jacket), water injection in muffler only
Water injection fitting (head) Not applicable
Water injection fitting (cone) Not applicable
Exhaust system
Water injection fitting (muffler) 3 x 3.5 mm (.138 in)
Exhaust valve RAVE
Starting system
Electric start
Fuel/oil mixture
VROI (Variable Rate Oil Injection)
Oil injection pump
Direct drivenLubrication
Oil injection type XP-S
TM
synthetic 2-stroke
Number of cylinders 2
Standard
82 mm (3.228 in)
First oversize 82.25 mm (3.238 in)Bore
Second oversize
Not applicable
Stroke
74 mm (2.91 in)
Displacement 781.6 cm
3
(47.7 in
3
)
Corrected compression ratio
6.0:1
Cylinder head volume
47.7 ± 0.4 cc
Cylinder head warpage (maximum)
0.05 mm (.002 in)
Piston ring type and quantity 1 semi-trapez -- 1 rectangular
New 0.40 - 0.55 mm (.016 - .022 in)
Ring end gap
Wear limit 1.00 mm (.039 in)
New 0.025 - 0.070 mm (.001 - .003 in)
Ring/piston groove clearance
Wear limit 0.24 mm (.009 in)
New (minimum) 0.13 mm (.005 in)
Piston/cylinder wall clearance
Wear limit 0.22 mm (.0087 in)
Cylinder taper (maximum)
0.10 mm (.004 in)
Cylinder out of round (maximum)
0.08 mm (.003 in)
New 0.230 - 0.617 mm (.009 - .024 in)
Connecting rod big end axial
play
Wear limit 1.2 mm (.047 in)
Crankshaft deflection
MAG side: 0.050 mm (.002 in);
PTO side: 0.030 mm (.001 in)
Opening 147° ±5° BTDC
Rotary valve timing
Closing 63.5° ±5° ATDC
Rotary valve duration 159°
Rotary valve/cover clearance 0.25 - 0.35 mm (.010 - .014 in)
New 0.023 - 0.034 mm (.0009 - .0013 in)
Connecting rod/crankshaft pin
radial clearance
Wear limit 0.050 mm (.002 in)
smr2004-3D 83
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