T: (800) 992-7007

P: (530) 886-0771

All orders ship from the U.S.A.

Keeping classic Minis on the road since 1974

(800) 992-7007 | (530) 886-0771


Piston, 1275cc, AE/Nural, 9.75 CR, Cooper S
  • Piston, 1275cc, AE/Nural, 9.75 CR, Cooper S
  • 21253 packaging examples
  • Condition: new
  • Sold -999
  • Made in the U.S.A.
  • DOT-approved False
  • This item qualifies for NESTED shipping; a pair can ship (almost) as cheaply as a single item!Nested Shipping Item
Retail: $99.95
Sale: $89.97
You Save: $9.98 (10.0%)
    SKU:  21253
    Availability: In Stock
    Piston Size:

    Update price

    High compression, dish-top 3-ring 1275cc piston from OEM supplier. Ideal for Cooper S spec 1275cc road engines. Thin-ring low-friction design is stronger than 21251 piston in area of oil control ring. Supplied with rings and pin. Sold each.

    Assembly Note: This piston will normally fit an undecked block, but the taller compression height of 1.5276" requires checking piston/deck clearance by test installing a single piston on the rod and attached to the crank. This is especially important when the block has previously been decked. Additionally, if you are taking your 1275 rods to a machine shop for piston installation, please note the offset of the rods in the block and advise your machine shop of the exact orientation. This is a somewhat unusual feature of the 1275cc engine and the shop must be made aware to prevent installation error.

    Single piston replacement ring sets available separately, see R41570.

    PACKAGING UPDATE: Item(s) may be packaged in either style shown, but please be assured that the same item(s) are in each. AE Hepolite is now owned by Federal Mogul and trademarked "Nural"