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Yamaha Motorcycle and ATV Big Bore Kits


Big Bore Kits for Yamaha Mini Cycles to Thumpers

Whether your into trail riding, motocross, enduro, hare scrambles, or
highway touring, we have the big bore kit you need. How many times have you thought ,
I wish I had bought a bigger bike? Size Matters! The short route to more power is a
bigger engine. This means a larger displacement
and the best way to increase displacement is an overbore kit from Kustom Kraft
Performance. A Kustom Kraft Big Bore offers the most reliable way to get the power you
expect. In most cases it's just bolt it on and tune the
carb and you're off to the races (after break-in that is).  Another advantage of doing a
big bore kit is when your cylinder is fried a big bore kit
becomes a no brainer.
Just pop your cylinder off your bike and send it to us along with the printed work order form. You'll find the link to the
order form in red above Fill it out completely and put it in the box with your carefully packed cylinder. Don't forget to
remove everything from the cylinder that's not needed for modification.
Yamaha YFM Blaster 240 cc Big bore Kit

Yamaha 2 Stroke Off Road Big Bore Kits

YZ 80  1993-2004 90cc Big bore Kit
Includes boring,sleeving,or Nikasil,
Piston, rings,pin, and gaskets, head
and power valve modifications as
required                                   $329.00
YZ 85  2002-2007 104cc Big Bore Kit
Includes boring, sleeving, or Nikasil
piston, rings, pin, and gaskets, head
and power valve modification, as
required.   
Details here             $429.00
YZ 80 1993-2001 104cc Big Bore Kit
Includes boring, sleeving, or Nikasil
piston, rings, pin, and gaskets, head
and power valve modification, as
required.  
Details here           $429.00
YZ 125  1989-2006 134cc Big Bore Kit
Includes boring, sleeving, or Nikasil
piston, rings, pin, and gaskets, head
and power valve modification, as
required.                                      $429.00
YZ 85 2002-2007  92cc Big Bore Kit
Includes boring, sleeving, or Nikasil
piston, rings, pin, and gaskets, head
and power valve modification, as
required.                                   $329.00
YZ 250 Most Years 265cc Big Bore Kit
Includes boring, sleeving, or Nikasil
piston, rings, pin, and gaskets, head
and power valve modification, as
required.                                      $449.00

Yamaha 4 Stroke Off Road Big Bore Kits

TT-R125 2000-2006 145cc Big Bore Kit
Includes boring, sleeving, or Nikasil
piston, rings, pin, and gaskets,  as
required.
camshaft additional  $354.00
YZ 450F 2003-2006  470cc Big Bore Kit
Includes boring, sleeving, or Nikasil
piston, rings, pin, and gaskets,  as
required.                                     $449.00
YZ 250F 2001-2006 262cc Big Bore Kit
Includes boring, sleeving, or Nikasil
piston, rings, pin, and gaskets,  as
required.                                     $389.00
XT,TT 500 1975-81 534cc Big Bore Kit
Includes boring, sleeving, or Nikasil
piston, rings, pin, and gaskets,  as
required.                                     $379.00
YZ 400F 1998-1999  420cc Big Bore Kit
Includes boring, sleeving, or Nikasil
piston, rings, pin, and gaskets,  as
required.                                     $450.00
XT 600 1984-1996 635cc Big Bore Kit
Includes boring, sleeving, or Nikasil
piston, rings, pin, and gaskets,  as
required.                                    $409.00
WR 400F 1998-2000  420cc Big Bore Kit
Includes boring, sleeving, or Nikasil
piston, rings, pin, and gaskets,  as
required.                                     $450.00
XT 600 1984-1996 675cc Big Bore Kit
Includes boring, sleeving, or Nikasil
piston, rings, pin, and gaskets,  as
required. *
case boring/not inc    $449.00
YZ 426F 2000-2002  444cc Big Bore Kit
Includes boring, sleeving, or Nikasil
piston, rings, pin, and gaskets,  as
required.                                     $440.00
BUY AMERICAN

Yamaha 2 Stroke ATV Big Bore Kits

Blaster 1988-2006 240cc Big Bore Kit
Includes sleeving, piston, rings, pin, head
mods and gaskets           $450.00
Reed is extra  
Banshee 1987-2006 409cc Big Bore Kit
Includes sleeving, piston, rings, pin,
head mods and gaskets           
includes Cool Head                  $924.00
Banshee 1987-2006 409cc Big Bore Kit
Includes sleeving, piston, rings, pin,
head mods and gaskets           $725.00
Wanted Late Model Cylinder Cores
Kodiac 400 1993-1999 425cc Big Bore Kit
Includes boring, sleeving, or Nikasil
piston, rings, pin, and gaskets,  as
required.                                        $359.00
Grizzly 600 1998-2001  675cc Big Bore Kit
Includes boring, sleeving, or Nikasil
piston, rings, pin, and gaskets,  as
required.  *
case mods not inc      $429.00*
YFZ 450  2004-2006  470cc Big Bore Kit
Includes boring, sleeving, or Nikasil
piston, rings, pin, and gaskets,  as
required.                                       $449.00
YFM 660R 1998-01 686cc Big Bore Kit
Includes boring, sleeving, or Nikasil
piston, rings, pin, and gaskets,  as
required.                                       $430.00
Grizzly 600 1998-2001  635cc Big Bore Kit
Includes boring, sleeving, or Nikasil
piston, rings, pin, and gaskets,  as
required.                                       $410.00
YFM 700 2006-2008 714cc Big Bore Kit
Includes boring, sleeving, or Nikasil
piston, rings, pin, and gaskets,  as
required.                                       $525.00

Yamaha 4 Stroke ATV Big Bore Kits

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