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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