Name: APRILIA SX 125
Brand: APRILIA
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The piston nominal size is stamped on the piston crown.

Pistons are grouped in types according to their sizes:

•

PISTON "A"; Piston diam. = 53.98 mm (2.1252 in), wear limit = 53.93 (2.1232 in), matching

cylinder: "A" or "AB".

•

PISTON "B"; Piston diam. = 53.99 mm (2.1256 in), wear limit = 53.93 (2.1236 in), matching

cylinder: "B" or "AB".

•

PISTON "Oversize 1"; Piston diam. = 54.00 mm (2.1260 in), wear limit = 53.93 (2.1240 in),

matching cylinder: "B" or re-smoothed cylinder.

•

PISTON "Oversize 2"; Piston diam. = 54.00 mm (2.1264 in), wear limit = 53.93 (2.1244 in),

matching cylinder: re-smoothed cylinder.

Pistons are available with different types of piston rings which are identified with their part number:

•

PISTON (code 294583); chrome-plated PISTON RING (code 215670)

•

PISTON (code 294587); chromium-ceramic PISTON RING (code 215720)

•

PISTON (code 294589); chromium-ceramic PISTON RING (code 215820)

•

PISTON (code 294588); chromium-ceramic PISTON RING (new type) (code 215825)

IF A PISTON SHOWS SIGNS OF EXCESSIVE WEAR AS IT HAS BEEN FUNCTIONING WITH LOW

QUALITY FUEL (HIGH IN SULPHUR), USE CHROMIUM-CERAMIC RINGS AND CHANGE THE

FUEL BRAND USED.

Installing the cylinder head

•

Fit the O-ring in the cylinder groove.

•

Place the head.

•

Tighten in a star sequence the five

socket head screws fixing the head, to-

gether with the washers.

TIGHTEN THE FIXING NUTS AGAIN, WHEN THE ENGINE

IS COLD, AFTER THE FIRST 500 KM (310 MI).

Engine RX SX 125

ENG - 112

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APRILIA SX 125 Specifications

General