@ HOW_MUCH TALLER/LONGER WILL_MY_NEW LIFAN_ENGINE BE ?50CC & 70CC CYLINDERS ARE 63MM LONG____(MM'S_OVER_50&70) 90CC 100CC AND 110CC CYLINDERS ARE 69MM LONG_____(+6MM)1/4" 125CC W/54X54 BORE/STROKE CYLINDERS ARE 69MM LONG__(+6MM)1/4" 120/125/138 W/55.5 STROKE CYL'S ARE 78.5MM LONG___(+15.5MM)5/8" 140CC CYLINDERS ARE 81.5MM LONG________________(+18.5MM)3/4" 150CC CYLINDERS ARE 78.2MM LONG________________(+15.2MM)5/8"