Athena
Cylinder Kits
YAMAHA
Standard Bore Cylinder Kit
Big Bore Cylinder Kit
Easy Cylinder
Models 2-Stroke
Years cc.
Dia.
Part No.
cc.
Dia.
Part No.
cc.
Dia.
Oversize Part No.
105 53mm 112 53mm
56-K154.53.KIT
YZ 85
2002 - 18
56-K183.53.BBLS*
YZ 85
2019 - 26 1997 - 04 2005 - 21
85
47.5mm 56-K238.475.CKA
106 53mm +5.5mm 56-K238.53.CKA 144 58mm +4mm 56-K155.58.K.A 144 58mm +4mm 56-K132.58.CKA
YZ 125 YZ 125
125 54mm 56-K155.54.CKA 125 54mm 56-K132.54.CKA
125 54mm 56-K1993.54.CKA 125 54mm 56-K1993.54.CKA.RACE 125 54mm 56-K132.54.CKA 125 54mm 56-K1993.54.CKA 125 54mm 56-K1993.54.CKA.RACE
2022 - 26
YZ 125
144 58mm +4mm 56-K1993.54.CKA.BB
YZ 125X
2020 - 21
144 58mm +4mm 56-K132.58.CKA
2023 - 26
YZ 125X
144 58mm +4mm 56-K1993.54.CKA.BB
YZ 250
2003 - 25
293 72mm +5.6mm 56-K156.72.CKA
*Kit includes crankshaft with long stroke rod
YAMAHA
Standard Bore Cylinder Kit
Big Bore Cylinder Kit
Easy Cylinder
Models 4-Stroke
Years cc.
Dia.
Part No.
cc.
Dia.
Part No.
cc.
Dia.
Oversize Part No.
WR 125R WR 125X YZ 250F YZ 250F YZ 250F YZ 250F YZ 250F
2009 - 10 2009 - 10
182 63mm 182 63mm
56-K157.63.KIT 56-K157.63.KIT
2001 - 07 250 77mm 56-K103.77.CGA 250 77mm 56-K103.77.K.A1 2008 - 13 250 77mm 56-K103.77.CGA 250 77mm 56-K103.77.K.A2 2014 - 15 250 77mm 56-K170.77.CGA 250 77mm 56-K170.77.CKA
290 83mm +6mm 56-K103.83.K.A1 290 83mm +6mm 56-K103.83.K.A2 276 81mm +4mm 56-K170.81.KIT 276 81mm +4mm 56-K170.81.KIT 283 82mm +5mm 56-K250.82.KIT 283 82mm +5mm 56-K250.82.KIT 304 85mm +8mm 56-K250.85.KIT2 ** 283 82mm +5mm 56-K250.82.KIT 304 85mm +8mm 56-K250.85.KIT3 ** 304 85mm +8mm 56-K250.85.KIT3 **
2016 - 18 250 77mm 56-K170.77.CGA
2019 - 20
250 77mm 56-K250.77.CKA
YZ 250F
2021 - 23
250 77mm 56-K250.77.CKA
YZ 250F
2024
250 77mm 56-K250.77.CKA
YZ 250F YZ 250F YZ 250FX YZ 250FX WR 250F WR 250F WR 250F WR 250F WR 250R WR 250X WR 450F YZ 450F YZ 450F YZ 450F YZ 450F YZ 450F YZ 450F YZ 450FX
2025 2026
250 77mm 56-K250.77.CKA 250 77mm 56-K250.77.CKA 250 77mm 56-K250.77.CKA 250 77mm 56-K250.77.CKA
2020 - 24 2025 - 26
283 82mm +5mm 56-K250.82.KIT
2001 - 12 250 77mm 56-K103.77.CGA 250 77mm 56-K103.77.K.A1 2015 - 17 250 77mm 56-K170.77.CGA 250 77mm 56-K170.77.CKA
290 83mm
56-K103.83.K.A1
276 81mm +4mm 56-K170.81.KIT 283 82mm +5mm 56-K250.82.KIT
2020 - 24 2025 - 26
250 77mm 56-K170.77.CKA 250 77mm 56-K170.77.CKA
2008 - 17 250 77mm 56-K144.77.CGA 2008 - 17 250 77mm 56-K144.77.CGA
290 83mm +6mm 56-K144.83.CKA 290 83mm +6mm 56-K144.83.CKA 478 98mm +3mm 56-K114.98.KITA 478 98mm +3mm 56-K114.98.KITA 480 98mm +3mm 56-K108.98.KIT 500 102mm +5mm 56-K165.102.CKA 500 102mm +5mm 56-K165.102.CKA 497 102mm +5mm 56-K198.102_BB.ATH 496 102mm +5mm 56-K251_102.KIT 497 102mm +5mm 56-K198.102_BB.ATH
2003 - 06 450 95mm 56-K114.95.CGA 450 95mm 56-K114.95.CKA 2003 - 05 450 95mm 56-K114.95.CGA 450 95mm 56-K114.95.CKA 2006 - 09 450 95mm 56-K108.95.CGA 450 95mm 56-K108.95.CKA 2010 - 13 450 97mm 56-K165.097.CGA 450 97mm 56-K138.097.CKA 2014 - 17 450 97mm 56-K165.097.CGA 450 97mm 56-K165.097.CKA 2018 - 19 450 97mm 56-K198.97.CGA 450 97mm 56-K198.97.CKA
2020 - 22 450 97mm 56-K312.97.CKA
450 97mm 56-K251.97.CKA
2019 - 20 450 97mm 56-K198.97.CGA 450 97mm 56-K198.97.CKA
** Includes GET Boost
*Please visit our website for current prices E103
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