442 / 1258
ENGINE
442
body
accessories
handlebar
& grips
cables &
levers
electrical
& ignition
engine
fuel &
intake
clutch
brakes
drive
steering &
suspension
bearings
tires
tools &
shop
exhaust
Manufactured in Italy,
Vertex, the premier
brand of OEM re-
placement pistons, is
the OEM supplier to
KTM and numerous
European motorcycle
and go-kart manufac-
turers. Vertex offers
enthusiasts state-of-
the-art, high-quality
pistons for nearly
any powersport use
from
motorcycles
and ATVs to marine and karting. Manufactured to the highest standards in Japan,
Vertex’s piston rings are produced by the OEM suppliers so that they are direct
OEM replacements. Vertex is the choice of those who truly seek the optimum in
powersport performance in any application
VERTEX PISTON TYPES
• Replica: cast OE replica
• Race: unique cast GP style with only one compression ring
• Pro: forged replacement for a OE cast piston for better strength
• Replica BB: big bore stock compression cast piston
• Pro Replica: forged OE stock compression piston
• Pro BB: forged OE stock compression big bore piston
• Pro Race: unique forged GP style race piston with only one
compression ring
• Pro HC: forged high compression pistons
MODEL
YEAR VERSION
COMP.
RATIO
CYLINDER
BORE
(MM)
PISTON
DIAM. (MM)
DIS-
PLACE-
MENT
SIZE
OVER
STD
TOP END
PISTON
KIT
PISTON
KIT
REPLACE-
MENT
RING(S)
CIRCLIP
COBRA
CX 50JR 06-15 CAST REPLICA
-----
903332
-----
-----
CX 50JR 06-15 CAST REPLICA
-----
903333
-----
-----
CX 50JR 06-15 CAST REPLICA
-----
903334
-----
-----
CX 50SR 06-15 CAST REPLICA
-----
903332
-----
-----
CX 50SR 06-15 CAST REPLICA
-----
903333
-----
-----
CX 50SR 06-15 CAST REPLICA
-----
903334
-----
-----
CX 65
07-09,
12-15
CAST REPLICA
-----
903338
-----
------
CX 65
07-09,
12-15
CAST REPLICA
------
903339 ------
-----
CX 65
10-11 CAST REPLICA
-----
903340
-----
------
CX 65
10-11 CAST REPLICA
------
903341 ------
-----
GAS GAS
-----
-----
-----
-----
EC 250
02-07 CAST REPLICA
66.4 66.34 250
------
901970 901103 901682
EC 300
02-13 CAST REPLICA
STD 72 71.95 300
-----
901971 901106 901682
HONDA
CR 125R
03 CAST REPLICA
STD 54 53.94 125
901981 -----
-----
-----
CR 125R
04 CAST REPLICA
54 53.93 125
901982 -----
-----
-----
CR 125R
04 CAST REPLICA
54 53.93 125
-----
901268 901581 901680
CR 125R 90-91 CAST REPLICA
STD 54 53.94 125
-----
901136 901581 901680
CR 125R 92-97 CAST REPLICA
STD 54 53.94 125
901983 -----
-----
-----
CR 125R 92-99 CAST REPLICA
STD 54 53.94 125
-----
901139 901581 901680
CR 125R 92-99 CAST RACE
54 53.94 125
-----
-----
901581 901680
CR 125R 92-99 CAST RACE
54 53.95 125
-----
-----
901581 901680
CR 125R 98-99 CAST REPLICA
STD 54 53.94 125
901984 -----
------
-----
CR 125R 00-02 CAST REPLICA
STD 54 53.94 125
901985 -----
------
-----
CR 125R 00-03 CAST REPLICA
STD 54 53.94 125
-----
901184 901581 901680
CR 125R 04-07 CAST RACE
54 53.93 125
-----
901269 901581 901680
CR 125R 04-07 FORGED BIG BORE
57 56.95 139 3
-----
901972 901101 901680
CR 125R 05-07 CAST REPLICA
STD 54 53.94 125
901986 -----
-----
-----
CR 125R 05-07 CAST REPLICA
STD 54 53.94 125
-----
901301 901581 901680
CR 250R 89-94 CAST REPLICA
STD 66.4 66.35 250
-----
901137 901103 901682
CR 250R 95-96 CAST REPLICA
STD 66.4 66.35 250
-----
901157 901103 901682
CR 250R 97-01 CAST REPLICA
STD 66.4 66.35 250
901987 -----
-----
-----
CR 250R 97-01 CAST REPLICA
STD 66.4 66.35 250
-----
901174 901103 901682
CR 250R 02-04 CAST REPLICA
STD 66.4 66.35 250
901988 -----
-----
-----