Tx Starflame Engine Specifications - Polaris TX Starfire Owner's Manual

TX STARFLAME ENGINE SPECIFICATIONS
EC29 PR EC34 PR EC43 PR EC65 PR
295cc 340cc 440cc 650cc
Number of cylinders 2 2 3 3
Bore 58mm 62mm 58mm 67.75 mm
Stroke
55.6 mm 55.6mm 55.5mm 60.0 mm
Displacement
Cubic Centimeters 293.79 cc 335.7 cc 439.9 cc 648.8 cc
Cubic Inches 17.941 Cl 20.504 Cl 26.911 Cl 39.631 Cl
Compression Ratio -
Effective 7.1 : 1 7.0: 1 7.1: 1 6.35: 1
Cylinder Head
Volume CC 15.5 cc 18.5 cc
15.5 cc 22.75 cc
Connecting Rod Material Chromium moly steel
Connecting Rod Brg. Type Needle Bearing
Cylinder Material Large fin aluminum casting w/chrome liner
Number of Main Bearings 5 5
7
7
Type of Main Bearings
Ball
Ball Ball Ball
Piston Type High silicone aluminum die-cast
Piston Clearance (Max.) .005" .0055" .005" .006"
Piston Ring Type
One Plain Type Ring Per Cylinder
Ring Material
Steel
Ring end gap (Max.) .015" .018" .015" .021"
Port Heights (Dimensions
when port begins to open)
Exhaust 28.6mm 29.0mm 28.6 mm 31.0mm
Intake 91.8 mm 91.8 mm 91.8 mm 99.0mm
Transfers
43.0 mm 43.0 mm 43.0 mm 47.0 mm
Port Widths (Measured in
Circumference of Cylinder)
Exhaust
37.0mm 39.6 mm 37.0 mm 42.0mm
Cooling Free Air Free Air Free Air Free Air
36