nytrdr24
+1y
THE STOCK BORE IS 86 MM, 133 CU INCHES=2184 CC, 0.020" OVER WOULD BE 86.508 MM, AND 0.040" OVER WOULD BE 87.016 MM. I HAD MINE BORED + 1MM TO 87MM WHICH BRINGS IT TO 136 CU IN = 2228 CC. IT WILL GIVE YOU MORE TORQUE, AND A LITTLE MORE HP, BUT DON'T EXPECT TO HAVE ANY MAJOR GAINES, UNLESS YOU CHANGE THE COMPRESSION RATIO, WHICH YOU CAN DO BY GETTING CUSTOM PISTONS, OR SHAVING THE HEAD SOME. WHILE ITS TORN APART, YOU OUGHT TO GET A CAM AND PUT IN IT, AND MAYBE SOME BIGGER VALVES, IF NOTHING ELSE PUT NEW VALVE GUIDES, SPRINGS & SEALS IN THE HEAD.