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
1981 - 21 40mm 56-W938+000.NT 2018 - 21 43.5mm 56-W9991.A.NT 1986 - 88 47mm 56-W939+000.NT
– – – –
– –
56-7996.DR
–
56-R713 56-R713 56-R713
56-827.SI 56-827.SI 56-827.SI 56-821.SI 56-821.SI 56-844.NT
1990
47mm 56-W939+000.NT
1983 - 06 47mm 56-W939+000.NT 5GH-11631-00
1993 - 01 47mm 56-W646+00A.NT 4ES-11631-01-AO 56-R703 2002 - 21 47.5mm 56-W646+050A.NT 5PA-11631-00-BO 56-R702
DT 125 LC
1982 - 86 1991 - 06 1985 - 90
56mm 56mm 56mm
56-W253.000.NT 56-W224.000.NT 56-W253.000.NT
– – –
– – –
DT 125 E/R/X
–
RD 125 LC
56-844.NT 56-836.SI 56-814.SI 56-814.SI 56-814.SI 56-814.SI
1997 - 00 54mm 56-W859.A.NT *
4XM-11631-30-BO 56-R704 ** 4XM-11631-30-BO 56-R704 **
YZ 125 YZ 125 YZ 125 YZ 125
54mm 56-W859.A.NT *
2001
2002 - 04 54mm 56-W797.A.NT * 2005 - 21 54mm 56-W845.A.NT * 2020 - 22 54mm 56-W845.A.NT * 1992 - 98 68mm 56-W677.A.NT 1992 - 98 68mm 56-W677.A.NT 1999 - 22 66.4mm 56-W742.A.NT 2016 - 22 66.4mm 56-W742.A.NT
56-R704 ** 56-R704 ** 56-R704 **
5NY-11631-01-A0
YZ 125X WR 250
4SR-11631-00-BO 56-R715 4SR-11631-00-BO 56-R715 5MW-11631-00-BO 56-R700 5MW-11631-00-BO 56-R700
–
YZ 250 YZ 250
56-809.SI 56-801.SI 56-801.SI
YZ 250X
4-Stroke TT 225L TTR 225 TTR 230 WR 250F
Piston Type
Years
Size
Piston Kit
Oem Ref
Piston Rings
Small End Bearing
N Forged N Forged N Forged N Forged
1999
70mm 56-W1030+00A.NT
- - -
1999 - 04 70mm 56-W1030+00A.NT 2005 - 22 70mm 56-W1030+00A.NT 2001 - 04 77mm 56-W022+00A.NF 2005 - 13 77mm 56-W9702.A 2005 - 13 77mm 56-W9702.A.NF 2015 - 19 77mm 56-W4961.A.NT 2020 - 22 77mm 56-W8812.A.NT 2001 - 04 77mm 56-W022+00A.NF 2005 - 13 77mm 56-W9702.A 2005 - 13 77mm 56-W9702.A.NF 2014 - 18 77mm 56-W4961.A.NT 2019 - 22 77mm 56-W8812.A.NT 2015 - 19 77mm 56-W4961.A.NT 2020 - 22 77mm 56-W8812.A.NT 1987 - 88 83mm 56-W4419+00A.NT 2003 - 15 95mm 56-W4785.A.NT 2003 - 15 95mm 56-W4785.A.NT.F 2016 - 19 97mm 56-W4963.A.NT 2016 - 19 97mm 56-W4963.A.NT.F 2003 - 09 95mm 56-W4785.A.NT 2003 - 09 95mm 56-W4785.A.NT.F 2010 - 13 97mm 56-W261.A.NT 2010 - 13 97mm 56-W261.A.NT.F 2014 - 17 97mm 56-W4963.A.NT 2014 - 19 97mm 56-W4963.A.NT.F 2016 - 18 97mm 56-W4963.A.NT 2016 - 19 97mm 56-W4963.A.NT.F 1984 - 04 95mm 56-W4797+00A.NT 1984 - 04 95mm 56-W4797+00A.NT 1984 - 04 95mm 56-W4797+00A.NT 1991 - 98 100mm 56-W8507+00A.NT
– – – – – – – –
56-R728 56-R728 56-R728 56-R728 56-R728 56-R728 56-R728 56-R728
– – – – – – – –
WR 250F Hi-Comp. 13.5:1
Hyperdryve
Hi-Comp. 13.5:1
N Forged N Forged N Forged N Forged
WR 250F WR 250F YZ 250F
YZ 250F Hi-Comp. 13.5:1
Hyperdryve
Hi-Comp. 13.5:1
N Forged N Forged N Forged N Forged N Forged
YZ 250F YZ 250F YZ 250FX YZ 250FX BW 350T
–
56-R728
–
– – – – – – – – – – – – – – – – –
56-R757 56-R759 56-R759
– – – – – – – – – – – – – – – – –
WR 450F Comp. 12.5:1
Hyperdryve
Comp. 12.5:1
N Forged
WR 450F Comp. 12.5:1
Hyperdryve
56-R7706.NT 56-R7706.NT
Comp. 12.5:1
N Forged
YZ 450F Comp. 12.5:1
Hyperdryve
56-R759 56-R759
Comp. 12.5:1
N Forged
YZ 450F Comp. 12.5:1
Hyperdryve
56-R7706.NT 56-R7706.NT 56-R7706.NT 56-R7706.NT 56-R7706.NT 56-R7706.NT
Comp. 12.5:1
N Forged
YZ 450F Comp. 12.5:1
Hyperdryve
Comp. 12.5:1
N Forged
YZ 450FX Comp. 12.5:1
Hyperdryve
Comp. 12.5:1
N Forged
XT 600
56-R760 56-R760 56-R760 56-R761
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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