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ENGINE
420
body
accessories
handlebar
& grips
cables &
levers
electrical
& ignition
engine
fuel &
intake
clutch
brakes
drive
steering &
suspension
bearings
tires
tools &
shop
exhaust
MODEL YEAR
BORE
X
STROKE
BORE
SIZE
TOP
END
KIT
SINGLE
PISTON RING SET PIN CLIP
TOP END
GASKET
KIT
TOP END
BEAR-
ING
ROTAX (2-STROKE)
Rotax250
96-01 67.5 67.5
103811
2658CS
S477
CW18
B1003
x
68
2677CS
69.8
SUZUKI (2-STROKE)
JR50
78-06 41
41
101383 826M04100 1614CD
S563
CW12 W6207 B1000
X
41.5
101384 826M04150 1634CD
37.8
42
101385 826M04200 1654CD
42.5
101855
100981
43
101856
1693CD
RM60
03
43
43
102462 648M04300 1693CD
S595
CW12 W5422 B1043
x
43.5
648M04350 1713CD
41.6
44
648M04400 1732CD
45
101243
1772CD
RM65
03-05 44.5 44.5
101139 752M04450 1752CD
S595
CW12 W5932 B1043
x
45
101140
1772CD
44.5mm
41.6 46.5
101582 752M04650 1830CD
W5889
45-
46.5mm
RM65
03-05 44.5 44.5
861M04450 104603
S595
CW12 W5932 B1043
x
41.6
RM80
77-81 49
49
100921
1929CD
S538
CW12
B1000
DS80
78-00
x
49.5
100922
1949CD
42
50
100923
1969CD
50.5
104099
1988CD
51
104100
2008CD
RM80
83-85 49
49
101222
1929CD
S288
CW14 100127 B1012
x
49.5
101223
1949CD
44
50
101224
1969CD
50.5
102811
1988CD
51
102812
2008CD
RM80
86-87 47.5 47.5
101225
1869CS
S288
CW14 104077 B1012
x
48
101226
1890CS
46.8 48.5
101227
1909CS
49
102813
1929CS
49.5
102814
1949CS
RM80
89-90 47.5 47.5
579M04750 1869CS
S288
CW14
B1012
x
48
579M04800 1890CS
46.8 48.5
579M04850 1909CS
49
101190
1929CS
49.5
101191
1949CS
RM80
91-01 47.5 47.5
100930 645M04750 1869CS
S517
CW14 W5261 B1012
*Power Valve must
be modified for
48mm and larger
x
47.75
100150
46.8
48
100932 645M04800 1890CS
48.25
100748
100152
48.5
100934 645M04850 1909CS
48.75
103454
100154
49
103156
103455
1929CS
49.5
103157
103456
1949CS
RM80
91-01 46.5 46.5
100146
S517
CW14 W5261 B1012
*International Bore -
Not available in U.S.
x
46.8