2005 Ski-Doo Racing Handbook, Page 17Get this manual
SECTION 022005 MODELS TECHNICAL DATA
MX 380F550F
MODEL ENGINE Engine type Number of cylinder Bore Stroke Displacement Compression ratio Maximum power engine speed (1) Piston ring type New Wear limit New Wear limit New Wear limit New Wear limit New Wear limit 100 RPM 1st 2nd mm (in) mm (in) Standard mm (in) mm (in) cm3 (in3) 368.30 (22.475 in) 11.2 0.5 7000 Semi-trapezoidal Rectangular 0.02 to 0.35 (.008 to .0138) 0.40 to 0.55 (.016 to .022) 62 (2.441) 61.00 (2.402) 553.40 (33.771) 9.6 0.5 7000 377 76 (2.992) 552 MX 380 550 F
Ring end gap
1.0 (.039) 0.04 to 0.08 (.0016 to .0030)
Ringpiston groove clearance
mm (in) 0.040 to 0.110 (.0016 to .0043) mm (in) mm (in) mm (in) mm (in) mm (in) mm (in) mm (in)
0.2 (.0079) 0.070 0.016 (.0028 .0006) 0.147 0.026 (.0058 .0010)