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 56-W938+000.NT 2018 - 24 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
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 - 25 47.5mm 56-W646+050A.NT 5PA-11631-00-BO 56-R702
56-W0078.5600 ** 56-W253.000.NT 56-W224.000.NT 56-W253.000.NT
1978 - 81 1982 - 86 1991 - 06 1985 - 90
56mm 56mm 56mm 56mm
– – – –
– – – –
–
DT 125 LC
56-844.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 - 24 54mm 56-W845.A.NT * 2020 - 24 54mm 56-W845.A.NT * 1992 - 98 68mm 56-W677.A.NT 1992 - 98 68mm 56-W677.A.NT 1999 - 24 66.4mm 56-W742.A.NT 2016 - 24 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
** 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
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 - 24 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 - 24 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 - 24 77mm 56-W8812.A.NT 2015 - 19 77mm 56-W4961.A.NT 2020 - 23 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 - 20 97mm 56-W4963.A.NT 2016 - 20 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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