Big-Bore-Kits

'+.200" 3-5/8" big bore shovel cylinder rear, black

+.200" longer (5.530") than stock. Stock length is 5.330". Crankcases must be bored to accept the larger diameter cylinder. A...

'+.200" 3-5/8" big bore shovel cylinder front, black

+.200" longer (5.530") than stock. Stock length is 5.330". Crankcases must be bored to accept the larger diameter cylinder. A...

MODULAR CENTRAL DOME 2T ATHENA CYLINDER KIT

DT/TZR170

HEAD FOR 2T ATHENA CYLINDER KITS

DT/TZR 125-170 I.M.02

EXHAUST VALVES KIT ATHENA BIG BORE CYLINDER KIT

YZ250 D.72

EXHAUST VALVES KIT FOR ATHENA STD CYLINDER KIT

YZ125 05

EXHAUST VALVES KIT FOR ATHENA STD CYLINDER KIT

EXHAUST VALVES KIT ATHENA BIG BORE CYLINDER KIT

ATHENA CYL. GASKET KIT

BIG BORE CYLINDER KIT 83 MM

290 CC TO INCREASE PERFOMANCE

BIG BORE KIT 83 MM, 290 CC

ATHENA CYL. GASKET KIT BIG BORE D.81

YZF250 2014-18

CYL. KIT 47,5MM, 85 CC

YAMAHA YZ 85 19-

BIG BORE KIT 85 MM, 300 CC

YZF 250 19-20 WRF 250 2020-23

BIG BORE KIT 102 MM, 500 CC

BIG BORE KIT 72 MM, 293 CC

STANDARD CYLINDER KIT 40 MM, 50 CC

BIG BORE KIT 82 MM, 276 CC

STANDARD CYLINDER KIT 78 MM, 250 CC

BIG BORE KIT 82 MM, 276 CC

BIG BORE KIT 80 MM, 290 CC

BIG BORE KIT 80 MM, 290 CC

BIG BORE KIT 82 MM, 276 CC

KX-F 250 2021-

BIG BORE KIT 50 MM, 80 CC