= Pistons and Gaskets - Forward Motion

Pistons and Gaskets

Big Bore Pistons and Gaskets

Buy Big Bore Pistons and Gaskets from Forward Motion

Forward Motion, powered by Millennium Technologies, is the online source for big bore piston and gasket kit replacements and fast order fulfillment. We stock a full range of Wiseco and Wossner pistons for Superminis, big bore 125s, and 250s up to 295cc. We also stock oversized gasket kits made for bikes with steel head gaskets not o-rings. Parts can be purchased as kits or individually. You can order these parts by giving us a call at 1-920-893-5595 Monday through Friday, 8:30am-5:00pm CST, or you can click on the BUY NOW link to buy the item through PayPal or use your credit card. Please have your application’s year, make, and model handy when contacting us by phone.

What’s Included in a Kit?

All of our piston kits (Wiseco, Wossner, & Vertex) include piston, pin, rings, and circlips. We also sell spare rings and piston bearings. The Cometic gasket kits include all of the gaskets and o-rings like the head and base, intake and exhaust, and the powervalve cover gaskets. We also sell individual spare head gaskets for big bores. You must buy the oversized head gasket along with the top end gasket kit for models like Honda CR and Kaw KX 144s and KX,RM,YZ295 big bores. The Cometic top end gasket kits for these models only include head gaskets suitable for the 134 and 265cc sizes.

How To Tell If Your Bike Has A Big Bore

If you’ve purchased a used bike with an unknown mechanical history and you are not sure what the displacement is exactly, Forward Motion has a service to identify the correct big bore parts for your engine’s top end. All we need are the numbers on the center of the piston crown, an accurate measurement of the piston, or you can send us the piston and top end assembly for us to determine for you. If your engine was converted to a big bore by a company that went out of business or has discontinued the old piston part number we can update your top end assembly to accept a modern piston.

Supermini Big Bore Kits

SUPERMINIS Part Number Price Buy Now
HONDA CR
Wiseco 100cc Piston 766M05200 $138.00
Cometic Gasket Kit W5973 $27.91
52mm Ring (TiN racing) 2047CSA $36.96
Bearing B2012 $15.82
Kawasaki KX80, 85, 100 1991-2014
Vertex 100cc Cast Piston Kit, 2 ring 23614 $150.67
Cometic Gasket W5674 $34.15
52.50mm Ring Set 2067CD $34.54
Vertex 107cc Cast Piston 23614200 $150.67
Cometic Gasket W5675 $39.85
54.50mm Ring Set 2146CD $34.54
Bearing B1006 $15.82
KTM 105sx 2004-2014
Wiseco 112cc Piston Kit 11749M05350 $186.08
Cometic Gasket Kit W6659 $33.54
53.50mm Ring $16.95
Bearing B1012 $15.82
Suzuki RM85 2002-2014
Wiseco 100cc Piston Kit 806MO5200 $138.00
52mm Ring (TiN racing) 2047CSA $36.96
52mm Ring 2047CS $316.95
Wiseco 105cc Piston 806M05300 $148.00
53mm Ring (single) 2087CSA $36.96
Cometic Gasket W5980 $28.43
Bearing B1012 $15.82
Yamaha YZ80 1993-2014
Wiseco 103.5cc Piston Kit 767M05250 $138.00
Wossner 103.5cc Piston Kit 8104D500 $138.00
Cometic Gasket W5983 $28.43
52.50mm Ring Set 2067CD $34.54
Bearing B1012 $15.82
Big Bore 125s Honda, Husky, kaw, KTM, Suzuki, Yamaha, GasGas, TM, Rotax, Pavesi
Honda CR125 1990-2003
Wiseco 134cc Piston 676M05600 $142.00
Cometic Gasket Kit W5965 (1990-99) $39.85
Cometic Gasket Kit W5903 (2000-02) $42.68
Cometic Gasket Kit W6127 (2003) $47.00
Bearing B1001 (2003) $15.82
Ring 2205CS $17.28
Honda CR125 2004-2007
Wiseco 134cc Piston Kit 841M05600 $162.00
Cometic Gasket Kit W6127 (2004) $47.00
Cometic Gasket kit W6389 (2005-07) $51.37
Ring 2205CS $17.28
Bearing B1001 $15.82
Honda CR125 2005-2007
Wiseco 139cc Piston Kit 841M05700 $162.00
Cometic Gasket Kit W6389 $51.37
Ring 2244CS $17.28
Bearing B1001 $15.82
Honda CR125 1988-1999,2005-2007
Wossner 144cc Piston Kit 8160D400 $118.00
Cometic Gasket Kit W5270 1988-1989 $37.95
Cometic Gasket Kit W5965 1990-1999 $39.85
Cometic Gasket Kit W6350 2005-2007 $48.91
Cometic Oversized Head Gasket H0409010S 1988-1999 $10.68
Cometic Oversized Head Gasket H2370SP4010S 2005-2007 $10.68
Ring 2284CS $17.28
Bearing B1001 $16.96
Husqvarna CR, WR125 1997-2014
Wossner 144cc Piston Kit 8160D400 $118.00
Cometic Gasket W5905 $71.22
Bearing B1001 $16.96
Ring 2284CS $17.28
Kawasaki KX125 1993-2002
Wossner 144cc Piston Kit 8160D400 $118.00
Cometic Gasket Kit W5349 (1993-94) $39.85
Cometic Gasket Kit W5455 (1995-97) $39.85
Cometic Gasket Kit W5666 (1999-00) $37.26
Cometic Gasket Kit W5901 (2001-02) $42.68
Bearing B1001 $16.96
Ring 2284CS $17.28
Cometic Oversized Gasket H0410010S $17.38
Kawasaki KX125 2003-2010
Wiseco 144cc Piston Kit 788M05800 $162.00
Cometic Gasket Kit W6253 $42.68
Bearing B1013 $16.96
Ring 2284CS $17.28
KTM 125SX , EXC 2001-2014
Wossner 144cc Piston Kit 8098D400 $118.00
Wiseco 144cc Piston 836M05800 $162.00
Cometic Gasket W5165 (1989) $35.57
Cometic Gasket W5316 (1990-96) $35.57
Cometic Gasket W6385 (1997-03) $32.28
Suzuki RM144 2004-2010
Wiseco Piston 836M05800 $162.00
Cometic Gasket W6254 $61.87
Bearing B1013 $16.96
Ring 2284CS $17.28
Yamaha YZ144 1994-2004
Wossner Piston 8160D400 $118.00
Cometic Gasket W5760 2001 $35.57
Cometic Gasket W5972 2002-2006 $38.42
Cometic Gasket W6633 2007-2014 $39.28
Bearing B1013 $15.82
Ring 2284CS $17.28
Suzuki RM125 1989-2003
Wossner 144cc Piston Kit 8160D400 $118.00
Cometic Gasket Kit W5165 1989 $35.57
Cometic Gasket Kit W5316 1990-96 $35.57
Cometic Gasket Kit W6385 1997-2003 $32.28
Bearing B1001 $16.96
Ring 2284CS $17.28
KTM (125 modded to 144 & 144 or 150SX modded to 155) 2001-2014
Wiseco Piston 836M05800 $162.00
Cometic Gasket Kit W5760 (2001) $35.57
Cometic Gasket Kit W5972 (2002-06) $38.42
Cometic Gasket Kit W6633 (2007-14) $39.28
Bearing B1013 $16.96
Ring 2284CS $17.28
Suzuki RM125 2004-2010
Wossner 144cc Piston Kit 8098D400 $118.00
Wiseco 144cc Piston Kit 836M05800 $162.00
Cometic Gasket Kit W6254 $61.87
Bearing B1013 $16.96
Ring 2284CS $17.28
Yamaha YZ125 1994-2014
Wiseco 134cc Piston Kit 797M05600 1998-2004 $142.00
Wiseco 134cc Piston Kit 846M05600 2005-2014 $162.00
Wiseco 144cc Piston Kit 846M05800 1994-2014 $162.00
Wossner 144cc Piston Kit 8160D400 1994-2014 $118.00
Cometic Gasket Kit W5420 1994-1995 $34.15
Cometic Gasket Kit W5677 1997-2001 $31.91
Cometic Gasket Kit W6140 2002-2004 $36.97
Bearing B1038 1994-2000 $15.82
Bearing B1001 2001-2014 $16.96
Ring 2284CS $17.28
TM and GasGas MX and Enduro Models (125 modded to 144)
Wossner 144cc Piston Kit 8160D400 $118.00
Bearing B1001 $16.96
Ring 2284CS $17.28
*Use Original Gasket
TM and Pavesi IC Kart Engined Modded to 144
Wiseco 144cc Piston Kit 836M05800 $162.00
Wossner 144cc Piston Kit 8098D400 $118.00
Bearing B1013 $16.96
Ring 2284CS $17.28
*Use Original Gasket
Big Bore 250s Honda, Husky, Kaw, KTM, Suzuki, Yamaha
Honda CR250 1986-2007
Wiseco 265cc Piston Kit 614M06850 1986-1996 $152.00
Wiseco 265cc Piston Kit 702M06850 1997-2001 $152.00
Wiseco 265cc Piston Kit 801M06850 2002-2004 $152.00
Wossner 265cc Piston Kit 8171D210 2005-2007 $188.00
Cometic Gasket Kit W4895 1986-1989 $42.68
Cometic Gasket Kit W5271 1990-1991 $42.68
Cometic Gasket Kit W5319 1992-2001 $39.92
Cometic Gasket Kit W6157 2002-2004 $49.34
Cometic Gasket Kit W6351 2005-2007 $52.91
Bearing B1003 $16.96
Ring Set 2697CD $34.54
Husqvarna CR/WR250 1998-2013
Wiseco 295cc Piston Kit 850M07200 $192.00
Cometic Gasket Kit W5906 $79.77
Bearing B1003 $16.96
Ring 2835CD $34.54
Kawasaki KX250 1993-2010
Wiseco 265cc Piston Kit 617M06850 1993-2004 $152.00
Wiseco 265cc Piston Kit 843M06850 2005-2008 $152.00
Cometic Gasket Kit W5350 1993-2003) $49.82
Cometic Gasket Kit W6354 2004 $547.20
Cometic Gasket Kit W6324 2005-2008 $45.94
Bearing B1022 $16.96
Ring Set 2697CD $34.54
Wiseco 295cc Piston Kit 11320M07200 1993-2008 $143.65
Wossner 295cc Piston Kit 29113 1993-2008 $143.65
Cometic Gasket Kit W5350 1993-2003 $49.82
Cometic Gasket Kit W6354 2004 $47.20
Cometic Oversized Head Gasket H0417010S 1993-2004 $47.20
Cometic Gasket Kit W6324 2005-2008 $45.94
Cometic Oversized Head Gasket 72mm H1842SP1020S 2005-2008 $24.95
Ring Set 2835CD $34.54
Bearing B1022 $16.96
KTM 250SX, EXC 1996-1999
Wiseco 295cc Piston Kit 712M07200 $192.00
Cometic Gasket Kit W5327 $42.68
Bearing B1037 $16.96
Ring Set 2835CD $34.54
KTM 250SX, EXC 2000-2006
Wiseco 295cc Piston Kit 850M07200 $192.00
Cometic Gasket Kit W5908 2000-2002 $46.99
Cometic Gasket Kit W6144 2003-2004 $51.26
Cometic Gasket Kit W6353 2005-2006 $31.31
Bearing B1037 $16.96
Ring Set 2835CD $34.54
Suzuki RM250 2000-2010
Wiseco 265cc Piston Kit 756M06850 2000-2002 $152.00
Wiseco 265cc Piston Kit 804M06850 2003-2010 $182.00
Wossner 265cc Piston Kit 8216D210 2003-2010 $152.00
Cometic Gasket Kit W5741 2000 $49.82
Cometic Gasket Kit W5899 2001-2002 $55.52
Bearing B1014 2000-2010 $18.09
Ring Set 2697CD $34.54
Wiseco 295cc Piston Kit 11320M07200 2003-2010 $143.65
Wossner 295cc Piston Kit 29113 2003-2010 $143.65
Cometic Gasket Kit W6111 $55.52
Cometic Oversized Head Gasket H1842SP1020S 2003-2010 $24.95
Ring Set 2835CD $34.54
Bearing B1014 $18.09
Yamaha YZ250 1995-2014
Wiseco 265cc Piston Kit 677M07000 1995-1998 $182.00
Wiseco 265cc Piston Kit 804M06850 1999-2014 $182.00
Wossner 265cc Piston Kit 8216D120 1999-2014 $152.00
Cometic Gasket Kit W5467 1995-1998 $42.97
Cometic Gasket Kit W5978 1999-2014 $42.68
Ring Set 2756CD 1995-1998 $34.54
Ring Set 2697CD 1999-2014 $34.54
Bearing B1003 1995-2014 $16.96
Wiseco 295cc Piston Kit 11320M07200 1999-2014 $143.65
Wossner 295cc Piston Kit 29113 1999-2014 $143.65
Cometic Gasket Kit W5978 1999-2014 $42.68
Ring Set 2835CD $34.54
Bearing B1003 $16.96
Cometic Oversized Head Gasket H0873SP2020S 1999-2014 $30.00

Millennium Technologies offers a free evaluation service for top end assemblies to determine the repair costs and provide you with an overview of the condition of the parts. We can even identify the original vendors. Just click and print a copy of our Service Order Form, fill it out and send it with your top end parts.

Trouble identifying your engine problems?

Click here for this piston diagnostic article in our Tech Self-Help section.


Millennium Technologies Family of Companies logo Powersports Products & Services:
Millennium Technologies Cylinder Services website link Revolution Performance website link Xport CNC Services website link Forward Motion website link Ballistic Performance Components website link