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
.53.KIT
56-K154 56-K183 56-K238 56-K155 56-K132
YZ 85
2002 - 18
.53.BBLS*
YZ 85
2019 - 26 1997 - 04 2005 - 21
85
47.5mm
.475.CKA .54.CKA .54.CKA
106 53mm +5.5mm 144 58mm +4mm 144 58mm +4mm
.53.CKA .58.K.A .58.CKA
56-K238 56-K155 56-K132 56-K1993 56-K1993 56-K132 56-K1993 56-K1993
YZ 125 YZ 125
125 54mm 125 54mm 125 54mm 125 54mm 125 54mm 125 54mm 125 54mm
.54.CKA
2022 - 26
YZ 125
144 58mm +4mm
.54.CKA.BB
56-K1993
.54.CKA.RACE
YZ 125X
2020 - 21
.54.CKA
144 58mm +4mm
.58.CKA
56-K132
.54.CKA
2023 - 26
YZ 125X
144 58mm +4mm
.54.CKA.BB
56-K1993
.54.CKA.RACE
YZ 250
2003 - 25
293 72mm +5.6mm
.72.CKA
56-K156
*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
.63.KIT .63.KIT .83.K.A1 .83.K.A2 .81.KIT .81.KIT .82.KIT .82.KIT .85.KIT2 **
56-K157 56-K157 56-K103 56-K103 56-K170 56-K170 56-K250 56-K250 56-K250 56-K250 56-K250 56-K250
2001 - 07 250 77mm 2008 - 13 250 77mm 2014 - 15 250 77mm 2016 - 18 250 77mm
.77.CGA 250 77mm .77.CGA 250 77mm .77.CGA 250 77mm
.77.K.A1 .77.K.A2 .77.CKA
290 83mm +6mm 290 83mm +6mm 276 81mm +4mm 276 81mm +4mm 283 82mm +5mm 283 82mm +5mm 304 85mm +8mm 283 82mm +5mm 304 85mm +8mm 304 85mm +8mm
56-K103 56-K103 56-K170 56-K170
56-K103 56-K103 56-K170
.77.CGA
2019 - 20
250 77mm
.77.CKA
56-K250
YZ 250F
2021 - 23
250 77mm
.77.CKA
56-K250
.82.KIT
YZ 250F
2024
250 77mm
.77.CKA
56-K250
.85.KIT3 ** .85.KIT3 **
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 250 77mm 250 77mm 250 77mm
.77.CKA .77.CKA .77.CKA .77.CKA .77.K.A1 .77.CKA .77.CKA .77.CKA .95.CKA .95.CKA .95.CKA .097.CKA .097.CKA .97.CKA .97.CKA .97.CKA
56-K250 56-K250 56-K250 56-K250 56-K103 56-K170 56-K250 56-K250 56-K114 56-K114 56-K108 56-K138 56-K165 56-K198 56-K251 56-K198
2020 - 24 2025 - 26
283 82mm +5mm
.82.KIT
56-K250
2001 - 12 250 77mm 2015 - 18 250 77mm
.77.CGA 250 77mm .77.CGA 250 77mm
290 83mm
.83.K.A1 .81.KIT .82.KIT .83.CKA .83.CKA .98.KITA .98.KITA
56-K103 56-K170
56-K103 56-K170 56-K250 56-K144 56-K144 56-K114 56-K114 56-K108 56-K165 56-K165 56-K198 56-K251 56-K198
276 81mm +4mm 283 82mm +5mm
2020 - 24 2025 - 26
250 77mm 250 77mm
2008 - 17 250 77mm 2008 - 17 250 77mm 2003 - 06 450 95mm 2003 - 05 450 95mm 2006 - 09 450 95mm 2010 - 13 450 97mm 2014 - 17 450 97mm 2018 - 19 450 97mm 2020 - 22 450 97mm 2019 - 20 450 97mm
.77.CGA .77.CGA
290 83mm +6mm 290 83mm +6mm 478 98mm +3mm 478 98mm +3mm 480 98mm +3mm 500 102mm +5mm 500 102mm +5mm 497 102mm +5mm 496 102mm +5mm 497 102mm +5mm
56-K144 56-K144 56-K114 56-K114 56-K108 56-K165 56-K165 56-K198 56-K312 56-K198
.95.CGA 450 95mm .95.CGA 450 95mm .95.CGA 450 95mm .097.CGA 450 97mm .097.CGA 450 97mm .97.CGA 450 97mm
.98.KIT
.102.CKA .102.CKA
.102_BB.ATH
.97.CKA
450 97mm
_102.KIT
.97.CGA 450 97mm
.102_BB.ATH
** Includes GET Boost
*Please visit our website for current prices E103
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