Section 03 787 RFI ENGINE
Subsection 06 (TECHNICAL SPECIFICATIONS)
TECHNICAL SPECIFICATIONS
ENGINE
GTI RFI
GTI RFI LE
Engine type
ROTAX 787 RFI, 2-stroke
Induction type
Rotary valve
Type
Water cooled, water injected with regulator
Water injection fitting (head)
4.0 mm (.157 in)
Water injection fitting (cone)
Not applicable
Exhaust system
Water injection fitting (muffler)
4.5 mm (.177 in)
Exhaust valve
Rotax Adjustable Variable Exhaust (RAVE)
Starting system
Electric start
Fuel/oil mixture
VROI (Variable Rate Oil Injection)
Oil injection pump
Direct driven
Lubrication
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 cm³ (47.7 in³)
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
Wear limit
0.24 mm (.009 in)
New (minimum)
0.13 mm (.005 in)
Piston/cylinder wall
clearance
Wear limit
0.22 mm (.009 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: 0.050 mm (.002 in);
PTO: 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
0.02 - 0.033 mm (.0008 - .00013 in)
Connecting rod/piston pin
radial clearance
Wear limit
0.05 mm (.002 in)
Type
SAE 30 motor oil
Counterbalance shaft oil
Capacity
30 mL (1 U.S. oz)
ADDITIONAL INFORMATION:
smr2005-087
111
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