Piston Kits
Namura
Namura N Forged 4-Stroke Piston Kits N amura Forged pistons offer dyno-proven gains in performance and durability over industry-standard 4032 forged pistons. Namura’s exclusive forged alloy offers lower expansion rates, allowing for tighter build tolerances and superior tensile and yield strength at operating temperatures. A ll new Forged pistons come with Namura’s signature features: 100% CNC-machine piston domes, hard anodized domes for reduced carbon build-up and heat resistance and M0S2 coated skirts for excellent break-in protection and properties.
YAMAHA
Years
Size
Piston Kit
Oem Ref
Piston Rings
Small End Bearing
PW 50 YZ 65 BW 80 BW 80 PW 80 YZ 80 YZ 85 DT 125
1981 - 24 40mm 2018 - 24 43.5mm 1986 - 88 47mm
+000.NT
– – – –
– –
.DR
56-W938
56-7996
.A.NT
–
56-W9991 56-W939
+000.NT +000.NT
.SI .SI .SI .SI .SI
56-R713 56-R713 56-R713 56-R703 56-R702
56-827 56-827 56-827 56-821 56-821
1990
47mm
56-W939 56-W939 56-W646 56-W646
1983 - 06 47mm 1993 - 01 47mm 2002 - 25 47.5mm
+000.NT 5GH-11631-00 +00A.NT 4ES-11631-01-AO +050A.NT 5PA-11631-00-BO
.5600 **
1978 - 81 1982 - 86 1991 - 06 1985 - 90
56mm 56mm 56mm 56mm
– – – –
– – – –
–
56-W0078 56-W253
DT 125 LC
.000.NT .000.NT .000.NT .A.NT * .A.NT * .A.NT * .A.NT * .A.NT *
.NT
56-844
DT 125 E/R/X
–
56-W224 56-W253 56-W859 56-W859 56-W797 56-W845 56-W845 56-W677 56-W677 56-W742 56-W742
RD 125 LC
.NT
56-844 56-836 56-814 56-814 56-814 56-814 56-809 56-801 56-801
** ** ** ** **
YZ 125 YZ 125 YZ 125 YZ 125
1997 - 00 54mm
4XM-11631-30-BO 4XM-11631-30-BO 5NY-11631-01-A0
.SI .SI .SI .SI .SI .SI .SI .SI
56-R704 56-R704 56-R704 56-R704 56-R704 56-R715 56-R715 56-R700 56-R700
2001
54mm
2002 - 04 54mm 2005 - 24 54mm 2020 - 24 54mm 1992 - 98 68mm 1992 - 98 68mm 1999 - 24 66.4mm 2016 - 24 66.4mm
YZ 125X WR 250
.A.NT .A.NT .A.NT .A.NT
4SR-11631-00-BO 4SR-11631-00-BO 5MW-11631-00-BO 5MW-11631-00-BO
–
YZ 250 YZ 250
YZ 250X
** Please Note; Piston brand for particular item is not Namura
4-Stroke TT 225L TTR 225 TTR 230 WR 250F
Piston Type
Years
Size
Piston Kit 56-W1030 56-W1030 56-W1030 56-W022 56-W9702 56-W9702 56-W4961 56-W8812 56-W022 56-W9702 56-W9702 56-W4961 56-W8812 56-W4961 56-W8812 56-W4419 56-W4785 56-W4785 56-W4963 56-W4963 56-W4785 56-W4785
Oem Ref
Piston Rings
Small End Bearing
N Forged N Forged N Forged N Forged
1999
70mm
+00A.NT +00A.NT +00A.NT
– – – – – – – – – – –
1999 - 04 70mm 2005 - 24 70mm 2001 - 04 77mm 2005 - 13 77mm 2005 - 13 77mm 2015 - 19 77mm 2020 - 24 77mm 2001 - 04 77mm 2005 - 13 77mm 2005 - 13 77mm 2014 - 18 77mm 2019 - 24 77mm 2015 - 19 77mm 2020 - 23 77mm 1987 - 88 83mm 2003 - 15 95mm 2003 - 15 95mm 2016 - 20 97mm 2016 - 20 97mm 2003 - 09 95mm 2003 - 09 95mm 2010 - 13 97mm 2010 - 13 97mm 2014 - 17 97mm 2014 - 19 97mm 2016 - 18 97mm 2016 - 19 97mm 1984 - 04 95mm 1984 - 04 95mm 1984 - 04 95mm 1991 - 98 100mm
+00A.NF
– – – – – – – –
56-R728 56-R728 56-R728 56-R728 56-R728 56-R728 56-R728 56-R728
WR 250F Hi-Comp. 13.5:1
Hyperdryve
.A
Hi-Comp. 13.5:1
N Forged N Forged N Forged N Forged
.A.NF .A.NT .A.NT
WR 250F WR 250F YZ 250F
+00A.NF
YZ 250F Hi-Comp. 13.5:1
Hyperdryve
.A
Hi-Comp. 13.5:1
N Forged N Forged N Forged N Forged N Forged
.A.NF .A.NT .A.NT .A.NT .A.NT
YZ 250F YZ 250F YZ 250FX YZ 250FX BW 350T
–
–
56-R728
+00A.NT
– – – – – – – – – – – – – – – – –
– – – – – – – – – – – – – – – – –
56-R757 56-R759 56-R759 56-R7706 56-R7706 56-R759 56-R759 56-R7706 56-R7706 56-R7706 56-R7706 56-R7706 56-R7706 56-R760 56-R760 56-R760 56-R761
WR 450F Comp. 12.5:1
Hyperdryve
.A.NT
Comp. 12.5:1
N Forged
.A.NT.F
WR 450F Comp. 12.5:1
Hyperdryve
.A.NT
.NT .NT
Comp. 12.5:1
N Forged
.A.NT.F
YZ 450F Comp. 12.5:1
Hyperdryve
.A.NT
Comp. 12.5:1
N Forged
.A.NT.F
YZ 450F Comp. 12.5:1
Hyperdryve
.A.NT
.NT .NT .NT .NT .NT .NT
56-W261 56-W261
Comp. 12.5:1
N Forged
.A.NT.F
YZ 450F Comp. 12.5:1
Hyperdryve
.A.NT
56-W4963 56-W4963 56-W4963 56-W4963 56-W4797 56-W4797 56-W4797 56-W8507
Comp. 12.5:1
N Forged
.A.NT.F
YZ 450FX Comp. 12.5:1
Hyperdryve
.A.NT
Comp. 12.5:1
N Forged
.A.NT.F +00A.NT +00A.NT +00A.NT +00A.NT
XT 600
TT 600/R XTZ 600
XTZ 660 Tenere
* Note; Most Kits are available from standard size up to +2.00mm over size *
*Please visit our website for current prices
E-mail: sales@oro2u.com
www.oro2u.com
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