2 Pistons with Piston Rings, Pins and Clips | Bore Size 71mm STD / +.020" / +.040" / +.060" | 7:1 / 9:1 / T120 Bonneville TR6 Trophy T110 Tiger 100 6T Thunderbird | 70 9488 70-9488 E9488 
 
Unit and Pre Unit Construction