Hastings, 3-7/16" bore chr/moly piston ring set. STD - 41-E78 1200cc/74" B.T. (excl. Flatheads) (NU) 939970 Kit include offset sprocket and

Kit include offset sprocket and machined spacer

3W power LED with aluminum CNC machined housing and transparent TranzLight® technology for extreme 360° visibility in virtually all directions

Available with upswept or standard style 4” megaphone muffler

Grinding stator and/or clutch hub is sometimes done

Hastings, 3-7/16" bore chr/moly piston ring set. STD - 41-E78 1200cc/74" B.T. (excl. Flatheads) (NU) 939970 Kit include offset sprocket andStd cyl. bore: 3. 4375" (87. 312mm). 1st ring: 1. 6mm. 2nd ring: 1. 6mm. oil ring: 4. 75mm. Tech tip: Piston grooves vs piston rings. It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3 piece