= Master list of big bore kits - Forward Motion

Master list of big bore kits

MASTER LIST OF BIG BORE KITS

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 deals include:

  • 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.

For 4-stroke engines, the package deals include:

  • 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

JAPANESE DIRT BIKES and ATV

Honda


ModelYearDisplacementPriceSpecial Notes
CR80/85 1986-07 92cc $475
CR80 1986-07 100cc $475
CR85 2005-07 92/100cc $475 Must install Mishimoto oversized radiator
CR125 1972-88 134cc $350
CR125 1989-04 134cc $500
CR125 1989-99 144cc $500
CR125 2005-07 134cc $550
CR125 2005-07 139 or 144cc $550
CR250 1978-80 265cc $500
CR250 1986-07 265cc $600
CRF150R 2007-09 159cc $495
CRF250R/X 2004-09 270cc $600 CYLINDER WORKS kit
CRF250R 2010-14 269cc $495
CRF450R/X 2002-08 470cc $495
CRF450R/X 2002-08 490cc $600 CYLINDER WORKS kit
CRF450R 2009-14 480cc $600 CYLINDER WORKS kit
CR500 1984-2001 520cc $495
ATC250R 1985-86 265cc $400
TRX250R 1986-89 265cc $400
TRX450ER 2006-09 477cc $600 CYLINDER WORKS kit

Kawasaki


ModelYearDisplacementPriceSpecial Notes
KX60 1983-2003 66cc $425
KX65 2000-14 72cc $425
KX80/85 1988-2014 92cc $475
KX80/85 1988-2014 100cc $475
KX80/85/100 1988-2014 107cc $475
KX125 1985-1993 134cc $500
KX125 1994-2014 144cc $550
KDX200 1986-88 212cc $600
KDX200 1995-2006 225cc $600
KX250 1987-2007 265cc $600
KX250 1993-2007 295cc $660
KX500 1985-2001 525cc $660
KX250F 2004-09 270cc $495 Works best with #2 Hot-Cams

Suzuki


ModelYearDisplacementPriceSpecial Notes
RM65 2003-05 72cc $350
RM85 2002-14 92cc $475 Crankcase clearance mods included send engine
RM85 2002-14 100cc $475 Crankcase clearance mods included send engine
RM125 1976-88 134cc $395
RM125 1989-2009 144cc $550 Crankcase clearance mods included send engine
RM250 1989-2008 265cc $600
RM250 2003-08 295cc $660
RMZ250 2004-09 270cc $495
LT250R 1988-92 265cc $450
LT500R 1987-90 525cc $450
LT-R450 2006-11 478cc $595

Yamaha


ModelYearDisplacementPriceSpecial Notes
PW50 1990-14 60cc $225
YZ80/85 1993-2014 105cc $475 Crankcase clearance mods included send engine
Hot-Rods stroker crank and bottom end kit bumps the YZ105 to 112cc $225
YZ125 1976-89 134cc $395
YZ125 1990-93 129cc $500
YZ125 1994-2014 134cc $500
YZ125 1994-2014 144cc $550 Crankcase clearance mods included send engine
Best pipe: DEP Rev pipe for the 2005+
YZ250 1979-89 265cc $395
YZ250 1990-2014 265cc $600
YZ250 1999-2014 295cc $660
New Athena YZ295 top end kits include ported cylinder head piston & gaskets and power-valves $1295 fits 1999-2014 YZ250 2-strokes
YZ/IT465 1980-81 478cc $425
YZ490/WR500 1983-93 510cc $475
YZ250F 2001-14 270cc $495
YZ426F 2000-02 444cc $495
YZ450F 2003-08 472cc $495
YFS200 1988-06 212cc $425
YFZ450 2009-12 478cc $600 CYLINDER WORKS kit

EUROPEAN DIRT BIKES and KARTS

Husqvarna


ModelYearDisplacementPriceSpecial Notes
CR/WR125 1998-2011 144cc $550
CR250 1998-2009 265cc $600
CR250 1998-2014 295cc $660

Gas Gas


ModelYearDisplacementPriceSpecial Notes
125 all models 2000-2014 144cc $550
250 all models 2000-14 265cc $660

KTM


ModelYearDisplacementPriceSpecial Notes
50SX LC 2001-08 58cc $425
50SX 2009-14 58cc $425
65SX/XC 1999-08 72cc $425
65SX/XC 2009-14 72cc $425
105SX 2004-14 112cc $500
125SX/EXC 2001 134cc $550
125SX/EXC 2001 144cc $550
125SX/EXC 2002-14 144cc $550
150SX 2007-14 155cc $550
200EXC/MXC/XC-W 1998-12 212cc $550
250SX/EXC 1996-05 295cc $660
300EXC/MXC 1991-14 310cc $660
250SX-F 2006-12 276cc $600 CYLINDER WORKS kit
250SX-F 2013-14 270cc $495
520/525SX-F 2000-10 530cc $495
525XC ATV 2008-12 530cc $495

TM Motorcycles


ModelYearDisplacementPriceSpecial Notes
125 1998-2007 144cc $550
250 1998-2013 265cc $600

TM Karts


ModelYearDisplacementPriceSpecial Notes
125 all models all years 134 & 144cc $550

Zundapp


ModelYearDisplacementPriceSpecial Notes
125 mx and enduro vintage 1970-77 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

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