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Standard Cylinder Bore: 3.4375" (87.312 mm). 1st Ring: 1.6 mm. 2nd Ring: 1.6 mm.
Oil ring: 4.75 mm.
Tech Tip: Piston Grooves vs. Piston Rings
It is not difficult to determine if a Hastings piston ring set will fit a certain piston.
You need to measure the height of the piston groove on the piston itself.
The top 2 grooves will be for the compression rings, the bottom groove will be for the oil ring.
In most cases, Hastings oil rings are low tension 3-way flexible vent type.
Ring heights are listed for reference.
Tech Tip: Oversized piston.
For each oversized cylinder, the diameter will increase by 0.010" (0.254 mm).
The standard cylinder bore is included for reference.
(Technical advice information provided by Hastings Manufacturing Company, Inc.)
Fits: > 41-E78 1200cc/74" BT (excl. Flathead) (NU)
Hastings, 3-7/16" Bore Chr/Moly Piston Ring Set Bore. +.020"
46.25 €
Oil ring: 4.75 mm.
Tech Tip: Piston Grooves vs. Piston Rings
It is not difficult to determine if a Hastings piston ring set will fit a certain piston.
You need to measure the height of the piston groove on the piston itself.
The top 2 grooves will be for the compression rings, the bottom groove will be for the oil ring.
In most cases, Hastings oil rings are low tension 3-way flexible vent type.
Ring heights are listed for reference.
Tech Tip: Oversized piston.
For each oversized cylinder, the diameter will increase by 0.010" (0.254 mm).
The standard cylinder bore is included for reference.
(Technical advice information provided by Hastings Manufacturing Company, Inc.)
Fits: > 41-E78 1200cc/74" BT (excl. Flathead) (NU)