Motorcycles and ATVs, Japanese and European Brands from 1970-2014

This is our master price list of the biggest selection of big bore kits available by any engine builder in the motorcycle industry. All of these kits include these services and parts.

For 2-stroke engines, the package includes:

  • Cleaning and disassembly.
  • Inspection and measurement.
  • Over-boring to big bore size 2, 3, 4 & 5mm.
  • Porting: You’ll get your choice of powerbands; more low/mid, more mid/top, broader powerband, and choices of fuel; pump or race gas.
  • Replating with nickel silicon-carbide composite plating and diamond honing.
  • Head mods: resurfacing, squish and bowl machining, polishing.
  • Powervalve service with assembly and timing, ready for installation!
  • Top End Parts include your choice of pistons from WISECO, WOSSNER, VERTEX, and PRO-X, all kits come with gasket kits, PV seals and o-rings, top end needle bearing, and alignment pins.
  • Piston check with ring end gapping set to install.
  • Cylinder bore set-up for no break-in, just ride!
  • Backed up by a 1-year warranty on the plating and free updates to the porting and diamond honing.
Forward Motion Big Bore Kit Master List

For 4-stroke engines, the package includes:

  • Over-boring 2, 3, 4mm
  • Plating with Diamond honing
  • Your choice of piston Wossner, Wiseco, JE, Vertex, CP
  • Piston check with ring end gapping and assembly of the ring pack
  • Backed up by a 1-year warranty on the plating and free diamond honing

Over 400 model years of Japanese and European dirt bikes from 1970-2015


JAPANESE DIRT BIKES and ATV

Honda


ModelYearDisp.PriceSpecial Notes
CR80/85 1986-2007 92cc $475
CR80 1986-2007 100cc $475
CR85 2005-2007 92/100cc $475 Must install Mishimoto oversized radiator
CR125 1973-1978 134cc $400
CR125 1989-2004 134cc $550
CR125 1989-1999 144cc $550
CR125 2005-2007 134cc $550
CR125 2005-2007 139 or 144cc $550
CR250 1978-1980 265cc $550
CR250 1986-2007 265cc $600
CRF150R 2007-2009 159cc $495
CRF250R /X 2004-2009 270cc $600 Cylinder Works Kit
CRF250R 2010-2015 269cc $495
CRF450R /X 2002-2008 470cc $495
CRF450R /X 2002-2008 490cc $600 Cylinder Works Kit
CRF450R 2009-2015 480cc $600 Cylinder Works Kit
CR500 1984-2001 520cc $475
ATC250R 1985-1986 265cc $400
TRX250R 1986-1989 265cc $400
TRX450ER 2006-2009 477cc $600 Cylinder Works Kit

Kawasaki


ModelYearDisp.PriceSpecial Notes
KX60 1983-2003 66cc $425
KX65 2000-2015 72cc $425
KX80/85 1988-2015 92cc $425
KX80/85 1988-2015 100cc $475
KX80 /85 /100 1988-2015 107cc $475
Hot-Rods stroker crank and bottom end kit bumps the KX80,85,100 $225
KX125 1985-1993 130cc $550
KX125 1994-2010 134cc $550
KX125 1994-2010 144cc $550
KDX200 1995-2006 225cc $600
KX250 1983-1986 255cc $550
KX250 1987-2008 265cc $600
KX250 1993-2008 295cc $660
KX500 1989-2004 525cc $660
KX500 1989-2005 540cc $660
KX250F 2004-2009 270cc $495 Works best with #2 Hot-Cams

Suzuki


ModelYearDisp.PriceSpecial Notes
RM65 2003-2005 72cc $350
RM85 2002-2015 92cc $475 Crankcase clearance mods included send engine
RM85 2002-2015 100cc $475 Crankcase clearance mods included send engine
RM125 1976-1989 134cc $325
RM125 1990-2010 144cc $550 Crankcase clearance mods included send engine
RM250 1983-1985 265cc $350
RM250 1987-1988 265cc $550
RM250 1989-2010 265cc $600
RM250 1996-2010 295cc $660
RMZ250 2004-2015 290cc $495
LT250R 1988-1992 265cc $450
RM465 1982-1983 500cc $495
LT500R 1987-1990 525cc $450
LT-R450 2006-2011 478cc $595

Yamaha


ModelYearDisp.PriceSpecial Notes
PW50 1990-2015 60cc $225
YZ80 1993-2015 92cc $425 Crankcase clearance mods included send engine
YZ80/85 1993-2015 103.5cc $475 Crankcase clearance mods included send engine
Hot-Rods stroker crank and bottom end kit bumps the YZ105 to 112cc $225
YZ125 1990-1993 130cc $450
YZ125 1986-1988 134cc $325
YZ125 1994-1996 134cc $450
YZ125 1998-2015 134cc $500
YZ125 1994-2015 144cc $550 Crankcase clearance mods included send engine
Best pipe: DEP Rev pipe for the 2005+
YZ250 1979-1991 265cc $375
YZ250 1992-2015 265cc $600
YZ250 1999-2015 295cc $660
New Athena YZ295 top end kits include ported cylinder head piston & gaskets and power-valves $1295 fits 1999-2015 YZ250 2-strokes
YZ /IT465 1980-1982 490cc $325
YZ490 /WR500 1983 510cc $425
YZ250F 2001-2015 270cc $495
YZ426F 2000-2002 444cc $495
YZ450F 2003-2008 472cc $495
YFS200 1988-2006 212cc $425
YFZ450 2006-2014 478cc $600 Cylinder Works Kit

EUROPEAN DIRT BIKES and KARTS

Husqvarna


ModelYearDisp.PriceSpecial Notes
CR/ WR125 1999-2011 144cc $550
CR250 1998-2009 265cc $600
CR250 1998-2013 295cc $660

Gas Gas


ModelYearDisp.PriceSpecial Notes
125 all models 2000-2015 144cc $550 Crankcase clearance mods included send engine
250 all models 2000-2015 265cc $600

KTM


ModelYearDisp.PriceSpecial Notes
50SX LC 2001-2015 58cc $425
65SX /XC 1999-2008 72cc $425
65SX 2009-2015 72cc $425
85SX 2003-2015 100cc $425
105SX 2004-2015 112cc $500
125SX /EXC 2001-2015 134cc $550
125SX /EXC 2001-2015 144cc $550
150SX 2007-2015 155cc $550
200EXC /MXC /XC-W 1998-2015 212cc $550
250SX /EXC 2000-2015 265cc $600
250SX /EXC 1996-2006 295cc $660
300EXC /MXC 1991-2015 310cc $660
250SX-F 2006-2012 276cc $600 Cylinder Works Kit
250SX-F 2013-2015 270cc $495
520/ 525SX-F 2000-2010 530cc $550
525XC ATV 2008-2012 530cc $550

TM Motorcycles


ModelYearDisp.PriceSpecial Notes
125 1998-2007 144cc $550 Crankcase clearance mods included send engine
250 1998-2013 265cc $600

TM Karts


ModelYearDisp.PriceSpecial Notes
125 all models all years 134 & 144cc $500 Crankcase clearance mods included send engine

Zundapp


ModelYearDisp.PriceSpecial Notes
125 mx and enduro vintage 1970-1977 150cc $325

HOW TO GET STARTED

Just CLICK & PRINT a copy of the Service Order Form and follow the directions on packaging your parts for shipping. All the options are listed for services, powerband choices, fuel types, spare parts, shipping methods, and payment options. Click here for the service order form

ALL INTERNATIONAL ORDERS GET OUR RUSH SERVICE FOR FREE!

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