Section 03 787 RFI ENGINE
Subsection 06 (TECHNICAL SPECIFICATIONS)
ENGINE 3D RFI 3D RFI PREMIUM
Engine type
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 Rotax Adjustable Variable Exhaust (RAVE)
Starting system Electric start
Fuel/oil mixture VROI (Variable Rate Oil Injection)
Oil injection pump
Direct drivenLubrication
Oil injection type XP-S™ 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±0.4cc
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)
New 0.020 - 0.033 mm (.0008 - .0013 in))
Connecting rod/piston pin
radial clearance
Wear limit 0.050 mm (.002 in)
Type
SAE 30 motor oil
Counterbalance shaft oil
Capacity 30 mL (1 U.S. oz)
ADDITIONAL INFORMATION:
112 smr2005-087
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