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Get more power and torque with premium quality European big bore kits that include, cylinder, piston, rings, and all gaskets required for a hassle free conversion. Spare pistons, rings, and gaskets a...

Get more power and torque with premium quality European big bore kits that include, cylinder, piston, rings, and all gaskets required for a hassle free conversion.

Spare pistons, rings, and gaskets also available.

Not all products are listed here - check the downloads section for a complete application list. Kits not in stock can usually be supplied in three to four weeks, depending on availability at the factory.

Get more power and torque with premium quality European big bore kits that include, cylinder, piston, rings, and all gaskets required for a hassle free conversion.

Spare pistons, rings, and gaskets also available.

Not all products are listed here - check the downloads section for a complete application list. Kits not in stock can usually be supplied in three to four weeks, depending on availability at the factory.

Sku
Product Name
Price
Picture of STANDARD BORE KIT YZF250 '01-06 GAC 0485100011
STANDARD BORE KIT YZF250 '01-06
STANDARD BORE KIT YZF250 '01-06
Availability: In stock
$995.00
Picture of BIG BORE KIT YAMAHA YZ125LC 05-14 GAC 0485100030
BIG BORE KIT YAMAHA YZ125LC 05-14
BIG BORE KIT YAMAHA YZ125LC 05-18 (2-STROKE)
Availability: Out of stock
$1,850.00
Picture of BIG BORE KIT YAMAHA YZ250F 01-07 / WR250F 01-12 290cc GAC 0485100012
BIG BORE KIT YAMAHA YZ250F 01-07 / WR250F 01-12 290cc
BIG BORE KIT YAMAHA YZ250F 01-07 / WR250F 01-12 290cc
Availability: Out of stock
$1,495.00
Picture of Big Bore Kit Yamaha YZ250F 250/290 08-13 GAC 0485100026
Big Bore Kit Yamaha YZ250F 250/290 08-13
Big Bore Kit Yamaha YZ250F 250/290 08-13
Availability: In stock
$1,495.00
Picture of BIG BORE KIT YAMAHA YFZ450 S ATV 04-11 d.98mm GAC 0485100016
BIG BORE KIT YAMAHA YFZ450 S ATV 04-11 d.98mm
BIG BORE KIT YAMAHA YFZ 450 S QUAD-ATV '04-'11 98mm/478cc
Availability: Out of stock
$1,495.00
Picture of BIG BORE KIT YAMAHA YZ450F 03-05,WR450F 03-06 480cc GAC 0485100014
BIG BORE KIT YAMAHA YZ450F 03-05,WR450F 03-06 480cc
BIG BORE KIT YAMAHA YZ450F 03-05.WR450F 03-06 480cc
Availability: In stock
$1,200.00
Picture of BIG BORE KIT YAMAHA YZ450F 06-09, WR450F 07-11 (478cc) GAC 0485100021
BIG BORE KIT YAMAHA YZ450F 06-09, WR450F 07-11 (478cc)
BIG BORE KIT YAMAHA YZ450F 06-09. WR450F 07-15 (478cc)
Availability: Out of stock
$1,195.00
Picture of BIG BORE KIT 293 CC YAMAHA YZ 250 LC '03-18 GAC 0485100042
BIG BORE KIT 293 CC YAMAHA YZ 250 LC '03-18
BIG BORE KIT 293 CC YAMAHA YZ 250 LC '03-18 (2-STROKE)
Availability: Out of stock
$2,899.00
Picture of BIG BORE KIT YAMAHA YZF 450  10-16 GAC 0485100054
BIG BORE KIT YAMAHA YZF 450 10-16
BIG BORE KIT YAMAHA YZF 450 10-16
Availability: In stock
$1,500.00
Picture of BIG BORE KIT YZ 250 '14-16 276 cc GAC 0485100050
BIG BORE KIT YZ 250 '14-16 276 cc
BIG BORE KIT YZ 250 F '14-'18 276 cc
Availability: Out of stock
$1,200.00
Picture of CYLINDER HEAD BIG BORE KIT YAMAHA YZ125 '05-16 - NLA GAC 0485200001B
CYLINDER HEAD BIG BORE KIT YAMAHA YZ125 '05-16 - NLA
CYLINDER HEAD BIG BORE KIT YAMAHA YZ125 '05-16 - NLA
Availability: In stock
$99.00
Picture of BIG BORE PISTON/RING KIT 57.94  YZ125 '97-'16 GAC S4C05800001A
BIG BORE PISTON/RING KIT 57.94 YZ125 '97-'16
BIG BORE PISTON/RING KIT 57.94 YZ125 '97-'16
Availability: In stock
$295.00
Picture of BIG BORE PISTON/RING KIT YZ125 97/10 GAC S4C05800001B
BIG BORE PISTON/RING KIT YZ125 97/10
BIG BORE PISTON/RING KIT 57.95 YZ125 '97-'16
Availability: In stock
$295.00
Picture of BIG BORE PISTON/RING KIT YAM YZ250F 01/07 WR250F 01/09 GAC S4F08300001B
BIG BORE PISTON/RING KIT YAM YZ250F 01/07 WR250F 01/09
BIG BORE PISTON/RING KIT YAM YZ250F 01/07 WR250F 01/09
Availability: In stock
$395.00
Picture of BIG BORE PISTON KIT d.83 YAMAHA YZ250F 08/10 GAC S4F08300008B
BIG BORE PISTON KIT d.83 YAMAHA YZ250F 08/10
BIG BORE PISTON KIT d.83 YAMAHA YZ250F 08/10
Availability: In stock
$399.00
Picture of BIG BORE PISTON/RING KIT YAMAHA YFZ450 04/06 4 WHEEL GAC S4F09800004B
BIG BORE PISTON/RING KIT YAMAHA YFZ450 04/06 4 WHEEL
BIG BORE PISTON/RING KIT YAMAHA YFZ450 04/06 4 WHEEL
Availability: In stock
$399.00
Picture of BIG BORE PISTON/RING KIT YAMAHA YZ450F (2WHEEL) 03/09 WR450F 03/10 GAC S4F09800005B
BIG BORE PISTON/RING KIT YAMAHA YZ450F (2WHEEL) 03/09 WR450F 03/10
BIG BORE PISTON/RING KIT YAMAHA YZ450F (2WHEEL) 03/09 WR450F 03/10
Availability: In stock
$419.00
Picture of BIG BOR PISTON 100 MM YZF 450 2010-2012 GAC S4F102000040
BIG BOR PISTON 100 MM YZF 450 2010-2012
BIG BORE PISTON 100 MM YZF 450 2010-2012
Availability: In stock
$419.00
Picture of BIG BORE PISTON/RING KIT YAMAHA YZ 250X '16 GAC S4F07200006A
BIG BORE PISTON/RING KIT YAMAHA YZ 250X '16
BIG BORE PISTON/RING KIT YAMAHA YZ 250X '16
Availability: In stock
$375.00
Picture of BIG BORE GASKET SET YZ125  97-10 GAC 0485160014
BIG BORE GASKET SET YZ125 97-10
BIG BORE GASKET SET YZ125 '05-'16
Availability: In stock
$99.00
Picture of BIG BORE GASKET SET YZ250F 01/10 WR250F 01/09 GAC 0485160007
BIG BORE GASKET SET YZ250F 01/10 WR250F 01/09
BIG BORE GASKET SET YZ250F '01-'07 / WR250F '01-'12
Availability: Out of stock
$119.00
Picture of BIG BORE GASKET SET YZ450F 03/05 WR450F 03/06 YZF450 ATV 04/09 GAC 0485160009
BIG BORE GASKET SET YZ450F 03/05 WR450F 03/06 YZF450 ATV 04/09
BIG BORE GASKET SET YAMAHA VARIOUS MX / ENDURO / QUAD-ATV
Availability: In stock
$159.00
Picture of BIG BORE GASKET SET YAMAHA YZ450F   WR450F 07/10 GAC 0485160013
BIG BORE GASKET SET YAMAHA YZ450F WR450F 07/10
BIG BORE GASKET SET YAMAHA YZ450F WR450F 07/10
Availability: In stock
$159.00
Picture of BIG BORE GASKET SET YZ450F 2010-2012 GAC 0485160025
BIG BORE GASKET SET YZ450F 2010-2012
BIG BORE GASKET SET YZ450F 2010-2012
Availability: In stock
$159.00
Picture of BIG BORE GASKET SET YAMAHA YZ 250X '16 GAC 0485160183
BIG BORE GASKET SET YAMAHA YZ 250X '16
BIG BORE GASKET SET YAMAHA YZ 250X '16
Availability: In stock
$49.00
Picture of EXHAUST VALVES PAIR YZ250 DIAM 72 GAC 0485303025
EXHAUST VALVES PAIR YZ250 DIAM 72
EXHAUST VALVES PAIR YZ250 DIAM 72
Availability: In stock
$479.00
Picture of BIG BORE RING SET YAMAHA YZ125 '05-14 GAC S41316125
BIG BORE RING SET YAMAHA YZ125 '05-14
BIG BORE RING SET YAMAHA YZ125 '05-14 - now use GAC S41316157
Availability: Out of stock
$25.00
Picture of RING SET YZ250F 01/10/WR250F 01/09/KX250F 04/10 RMZ250 04/09 GAC S41316133
RING SET YZ250F 01/10/WR250F 01/09/KX250F 04/10 RMZ250 04/09
RING SET YZ250F 01/10/WR250F 01/09/KX250F 04/10 RMZ250 04/09
Availability: In stock
$59.00
Picture of BIG BORE RING SET YZ450f 03/09, WR450F 03/10 GAC S41316027
BIG BORE RING SET YZ450f 03/09, WR450F 03/10
BIG BORE RING SET YZ450f 03/09. WR450F 03/10
Availability: In stock
$69.00
Picture of BIG BORE RING SET YZ450F 2010-2012 GAC S41316216
BIG BORE RING SET YZ450F 2010-2012
BIG BORE RING SET YZ450F 2010-2012
Availability: In stock
$55.00
Picture of PINSTON RING SET YZ125 '05-17 GAC S41316157
PINSTON RING SET YZ125 '05-17
PINSTON RING SET YZ125 '05-'16
Availability: In stock
$20.00
Picture of STANDARD BORE KIT YZF250 '01-06
STANDARD BORE KIT YZF250 '01-06
STANDARD BORE KIT YZF250 '01-06
Availability: In stock
$995.00
Picture of BIG BORE KIT YAMAHA YZ125LC 05-14
BIG BORE KIT YAMAHA YZ125LC 05-14
BIG BORE KIT YAMAHA YZ125LC 05-18 (2-STROKE)
Availability: Out of stock
$1,850.00
Picture of BIG BORE KIT YAMAHA YZ250F 01-07 / WR250F 01-12 290cc
BIG BORE KIT YAMAHA YZ250F 01-07 / WR250F 01-12 290cc
BIG BORE KIT YAMAHA YZ250F 01-07 / WR250F 01-12 290cc
Availability: Out of stock
$1,495.00
Picture of Big Bore Kit Yamaha YZ250F 250/290 08-13
Big Bore Kit Yamaha YZ250F 250/290 08-13
Big Bore Kit Yamaha YZ250F 250/290 08-13
Availability: In stock
$1,495.00
Picture of BIG BORE KIT YAMAHA YFZ450 S ATV 04-11 d.98mm
BIG BORE KIT YAMAHA YFZ450 S ATV 04-11 d.98mm
BIG BORE KIT YAMAHA YFZ 450 S QUAD-ATV '04-'11 98mm/478cc
Availability: Out of stock
$1,495.00
Picture of BIG BORE KIT YAMAHA YZ450F 03-05,WR450F 03-06 480cc
BIG BORE KIT YAMAHA YZ450F 03-05,WR450F 03-06 480cc
BIG BORE KIT YAMAHA YZ450F 03-05.WR450F 03-06 480cc
Availability: In stock
$1,200.00
Picture of BIG BORE KIT YAMAHA YZ450F 06-09, WR450F 07-11 (478cc)
BIG BORE KIT YAMAHA YZ450F 06-09, WR450F 07-11 (478cc)
BIG BORE KIT YAMAHA YZ450F 06-09. WR450F 07-15 (478cc)
Availability: Out of stock
$1,195.00
Picture of BIG BORE KIT 293 CC YAMAHA YZ 250 LC '03-18
BIG BORE KIT 293 CC YAMAHA YZ 250 LC '03-18
BIG BORE KIT 293 CC YAMAHA YZ 250 LC '03-18 (2-STROKE)
Availability: Out of stock
$2,899.00
Picture of BIG BORE KIT YAMAHA YZF 450  10-16
BIG BORE KIT YAMAHA YZF 450 10-16
BIG BORE KIT YAMAHA YZF 450 10-16
Availability: In stock
$1,500.00
Picture of BIG BORE KIT YZ 250 '14-16 276 cc
BIG BORE KIT YZ 250 '14-16 276 cc
BIG BORE KIT YZ 250 F '14-'18 276 cc
Availability: Out of stock
$1,200.00
Picture of CYLINDER HEAD BIG BORE KIT YAMAHA YZ125 '05-16 - NLA
CYLINDER HEAD BIG BORE KIT YAMAHA YZ125 '05-16 - NLA
CYLINDER HEAD BIG BORE KIT YAMAHA YZ125 '05-16 - NLA
Availability: In stock
$99.00
Picture of BIG BORE PISTON/RING KIT 57.94  YZ125 '97-'16
BIG BORE PISTON/RING KIT 57.94 YZ125 '97-'16
BIG BORE PISTON/RING KIT 57.94 YZ125 '97-'16
Availability: In stock
$295.00
Picture of BIG BORE PISTON/RING KIT YZ125 97/10
BIG BORE PISTON/RING KIT YZ125 97/10
BIG BORE PISTON/RING KIT 57.95 YZ125 '97-'16
Availability: In stock
$295.00
Picture of BIG BORE PISTON/RING KIT YAM YZ250F 01/07 WR250F 01/09
BIG BORE PISTON/RING KIT YAM YZ250F 01/07 WR250F 01/09
BIG BORE PISTON/RING KIT YAM YZ250F 01/07 WR250F 01/09
Availability: In stock
$395.00
Picture of BIG BORE PISTON KIT d.83 YAMAHA YZ250F 08/10
BIG BORE PISTON KIT d.83 YAMAHA YZ250F 08/10
BIG BORE PISTON KIT d.83 YAMAHA YZ250F 08/10
Availability: In stock
$399.00
Picture of BIG BORE PISTON/RING KIT YAMAHA YFZ450 04/06 4 WHEEL
BIG BORE PISTON/RING KIT YAMAHA YFZ450 04/06 4 WHEEL
BIG BORE PISTON/RING KIT YAMAHA YFZ450 04/06 4 WHEEL
Availability: In stock
$399.00
Picture of BIG BORE PISTON/RING KIT YAMAHA YZ450F (2WHEEL) 03/09 WR450F 03/10
BIG BORE PISTON/RING KIT YAMAHA YZ450F (2WHEEL) 03/09 WR450F 03/10
BIG BORE PISTON/RING KIT YAMAHA YZ450F (2WHEEL) 03/09 WR450F 03/10
Availability: In stock
$419.00
Picture of BIG BOR PISTON 100 MM YZF 450 2010-2012
BIG BOR PISTON 100 MM YZF 450 2010-2012
BIG BORE PISTON 100 MM YZF 450 2010-2012
Availability: In stock
$419.00
Picture of BIG BORE PISTON/RING KIT YAMAHA YZ 250X '16
BIG BORE PISTON/RING KIT YAMAHA YZ 250X '16
BIG BORE PISTON/RING KIT YAMAHA YZ 250X '16
Availability: In stock
$375.00
Picture of BIG BORE GASKET SET YZ125  97-10
BIG BORE GASKET SET YZ125 97-10
BIG BORE GASKET SET YZ125 '05-'16
Availability: In stock
$99.00
Picture of BIG BORE GASKET SET YZ250F 01/10 WR250F 01/09
BIG BORE GASKET SET YZ250F 01/10 WR250F 01/09
BIG BORE GASKET SET YZ250F '01-'07 / WR250F '01-'12
Availability: Out of stock
$119.00
Picture of BIG BORE GASKET SET YZ450F 03/05 WR450F 03/06 YZF450 ATV 04/09
BIG BORE GASKET SET YZ450F 03/05 WR450F 03/06 YZF450 ATV 04/09
BIG BORE GASKET SET YAMAHA VARIOUS MX / ENDURO / QUAD-ATV
Availability: In stock
$159.00
Picture of BIG BORE GASKET SET YAMAHA YZ450F   WR450F 07/10
BIG BORE GASKET SET YAMAHA YZ450F WR450F 07/10
BIG BORE GASKET SET YAMAHA YZ450F WR450F 07/10
Availability: In stock
$159.00
Picture of BIG BORE GASKET SET YZ450F 2010-2012
BIG BORE GASKET SET YZ450F 2010-2012
BIG BORE GASKET SET YZ450F 2010-2012
Availability: In stock
$159.00
Picture of BIG BORE GASKET SET YAMAHA YZ 250X '16
BIG BORE GASKET SET YAMAHA YZ 250X '16
BIG BORE GASKET SET YAMAHA YZ 250X '16
Availability: In stock
$49.00
Picture of EXHAUST VALVES PAIR YZ250 DIAM 72
EXHAUST VALVES PAIR YZ250 DIAM 72
EXHAUST VALVES PAIR YZ250 DIAM 72
Availability: In stock
$479.00
Picture of BIG BORE RING SET YAMAHA YZ125 '05-14
BIG BORE RING SET YAMAHA YZ125 '05-14
BIG BORE RING SET YAMAHA YZ125 '05-14 - now use GAC S41316157
Availability: Out of stock
$25.00
Picture of RING SET YZ250F 01/10/WR250F 01/09/KX250F 04/10 RMZ250 04/09
RING SET YZ250F 01/10/WR250F 01/09/KX250F 04/10 RMZ250 04/09
RING SET YZ250F 01/10/WR250F 01/09/KX250F 04/10 RMZ250 04/09
Availability: In stock
$59.00
Picture of BIG BORE RING SET YZ450f 03/09, WR450F 03/10
BIG BORE RING SET YZ450f 03/09, WR450F 03/10
BIG BORE RING SET YZ450f 03/09. WR450F 03/10
Availability: In stock
$69.00
Picture of BIG BORE RING SET YZ450F 2010-2012
BIG BORE RING SET YZ450F 2010-2012
BIG BORE RING SET YZ450F 2010-2012
Availability: In stock
$55.00
Picture of PINSTON RING SET YZ125 '05-17
PINSTON RING SET YZ125 '05-17
PINSTON RING SET YZ125 '05-'16
Availability: In stock
$20.00