Pistons for Harley Flathead and J modell with 3-5/16" Bore.
Fits:
Harley 1000cc J 1924-29 (with 20,1mm piston pin)
Harley 1200cc VL UL 1930-48
Note!, can be used for 1916-1924 J models if you have connecting rods for 20,1mm piston pin.
Below are the nominal BORE measurements for these piston sets:
Please note that these measurements are referring to the nominal bore of the cylinder and NOT actual piston diameter.
STD = 3.3125” (~84.13mm)
+.010” = 3.3225” (~84.39mm)
+.020” = 3.3325” (~84.64mm)
+.030” = 3.3425” (~84.90mm)
+.040” = 3.3525” (~85.15mm)
+.050” = 3.3625” (~85.40mm)
+.060” = 3.3725” (~85.66mm)
+.070” = 3.3825” (~85.91mm)
+.080” = 3.3925” (~86.17mm)
+.090” = 3.4025” (~86.42mm)
Location: Kolvar&Ringar