Hastings, 3-7/8" chr/moly piston ring set. STD

Description

Replacement for 99-06 Twin Cam models that are equipped with the 95" (1550cc) 3-7/8" OEM big bore kit. Also fits 07-17 Twin Cam 103" (1690cc) engine.

Std cyl. bore: 3.875" (98.425mm).

1st ring: 1.5mm.

2nd ring: 1.5mm.

oil ring: 2.5mm.



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 flex vent type. Ring heights are listed for reference.

Tech tip: Piston oversizes.

For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference.

(Information provided by Hastings Manufacturing Company, Inc.)

Specifications

Fitment

99-06 (NU) Twin Cam A/B with 1550CC (95") Big Bore; 07-17 Twin Cam 103" engine

Part numbers