Bombardier DS 650 Engine Data

Engine Type

Bombardier Rotax 654, 4 Stroke, Double Overhead Camshaft,   Bush Chain Drive, Liquid Cooled
Starting System

Electric (start in any gear with clutch applied or on neutral
Number of Cylinders

1
Number of Valves 4 Bucket Tappet Operated Valves
Decompressor Type Automatic
Bore                                                                                  mm (in) 100 (3.94)
Stroke                                                                                mm (in) 83 (3.27)
Displacement                                                                   cm3 (in3) 652 (39.7)
Compression Ratio 9.7:1
Calibration Engine Speed                                                100 RPM 13+1
Intake Valve Opening 17° BTDC
Intake Valve Closing 45° ABDC
Exhaust Valve Opening 47° BBDC
Exhaust Valve Closing 15° ATDC
Valve Clearance When Engine Cold       (maximum 35°C / 95°F)

Exhaust / Intake   mm (in)

 0.1 to 0.15 (0.004 to 0.006)
Valve Length Intake                 mm (in) 90.91 and 90.76 (3.579 and 3.573)
Exhaust               mm (in) 90.65 and 90.05 (3.568 and 3.545)
Plate Diameter Intake                 mm (in) 36 (1.42)
Exhaust               mm (in) 31 (1.22)
Shaft Diameter Intake                 mm (in) 5.95 (0.24)
Exhaust               mm (in) 5.935 (.023)
Valve Seat Angle Intake                 mm (in) 45°
Exhaust               mm (in) 30°
Piston Ring End Gap Minimum             mm (in) 0.2 (0.008)
Maximum            mm (in) 0.4 (0.016)
Wear Limit          mm (in) 1 (0.04)
Ring / Piston Grove Clearance Minimum             mm (in) 0.03 (0.0012)
Maximum            mm (in) 0.065 (0.0026)
Wear Limit          mm (in) 0.15 (0.006)
Piston / Cylinder Clearance
Wear Limit          mm (in) 0.09 (0.004)
Cylinder Minimum             mm (in) 100 (3.9371)
Maximum            mm (in) 100.012 (3.9376)
Wear Limit          mm (in) 100.03 (3.9382)
Crankshaft Balance Factor                                                          % 47 ± 3
Crankshaft Deflection                                                         mm (in) 0.1 (0.004)
Connecting Rod Big End Axial Play Wear Limit          mm (in) 0.8 (0.794)
Wear Limit          mm (in) 22.04 (0.868)
Wear Limit          mm (in) 0.06 (0.002)
Camshaft                                     (Intake and Exhaust) Bearing Point 0    mm (in) 21.95 (0.864)
Cam Height         mm (in) 39.7 (1.56)

Timing Chain                                                                      mm (in) (gap from sealing face to piston of chain tensioner)                  

9.5 (0.374)
Lubrication Dry Sump Lubrication by Oil Pump, Replaceable Oil Filter
Oil Filter Main-Flow Type
Air Filter Type Cleanable Synthetic Panelette / Foam
Exhaust System Type Bombardier, Stainless Header Pipe, Painted Steel Mufler
Spark Arrestor USFS Approved