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 Singles CYLINDER BORING - IRON SLEEVE

LC180  Bore and hone with piston purchase $47.50
LC181  Bore and hone with customer's pistons 85.00
LC201D Deglaze cylinder 16.00

Singles CYLINDER BORING - ALUMINUM NIKASIL PLATED

LC145 Bore and re-nikasil single cylinder - w/Piston purchase 210.00
LC146 Bore and re-nikasil single cylinder - w/customer piston 230.00


YAMAHA PISTONS...

Athena Big Bore Cylinders from Bigborethumpers.com are an all new casting specifically for big bores. They are not simply bored out stock size blocks. Athena makes these blocks with larger water jackets and thicker cylinder walls to help with cooling. Athena kits come with new cylinder, piston, rings, pin gaskets. Click here to see the complete line of Athena cylinder kits.


SCROLL DOWN FOR ATV PISTONS...

YAMAHA - YZ250F 2001-04
DISPLACEMENT BORE SIZE COMP RATIO PART# MFG CODE NOTES PRICE
250cc 77MM 13.5:1 221798 STD 167.53
263cc 79MM 13:1 247943 2 mm over. 167.53
263cc 79MM 12.7:1 4872M07900 2 mm over. 187.00
270cc 80MM 13:1 21002-K01-JE Piston, rings,pin, clips gaskets and block. 559.00

YAMAHA - YZ250F 2005-08
DISPLACEMENT BORE SIZE COMP RATIO PART# MFG CODE NOTES PRICE
263cc 79MM 12.7:1 4872M07900 2 mm over. 187.00
263cc 79MM 13:1 247939 2 mm over. 167.53

 

YAMAHA - WR250 2001-2004
DISPLACEMENT BORE SIZE COMP RATIO PART# MFG CODE NOTES PRICE
270cc 80MM 13:1 21002-K01-JE Piston, rings,pin, clips gaskets and block. 559.00

YAMAHA - YZ400F 1998-'99, WR4000F 1998-00
DISPLACEMENT BORE SIZE COMP RATIO PART# MFG CODE NOTES PRICE
417cc 94MM 13.5:1 4650M09400 2 mm over. Discontinued

YAMAHA - YZ426 2000-02, WR426 2001-02
DISPLACEMENT BORE SIZE COMP RATIO PART# MFG CODE NOTES PRICE
426cc 95MM 13.5:1 4694M09500 STD 188.70
444cc 97MM 13.5:1 4694M09700 2 mm over. 212.50

YAMAHA - YZ450 2006-07
DISPLACEMENT BORE SIZE COMP RATIO PART# MFG CODE NOTES PRICE
450cc 95MM 14:1 4929M09500 STD 183.62

YAMAHA - YZ450F 2003-08
DISPLACEMENT BORE SIZE COMP RATIO PART# MFG CODE NOTES PRICE
449cc 95MM 13.5:1 4786M09500 STD 188.70
449cc 95MM 13.5:1 247625 STD 167.53
469cc 97MM 12.5:1 4785M09700 2 mm over. Discontinued
469cc 97MM 13.5:1 4786M09700 2 mm over. Discontinued
469cc 97MM 13:1 247627 2 mm over. 167.53
478cc 98MM 13:1 247942 3 mm over. 167.53
478cc 98MM 13.5:1 21003-K01-CP Piston, rings,pin, clips gaskets and block. 589.00

YAMAHA - XT500, TT500, SR500
DISPLACEMENT BORE SIZE COMP RATIO PART# MFG CODE NOTES PRICE
534cc 90MM 11:1 4190M09000 3 mm over. 158.74

YAMAHA ATV - YFZ450 2004
DISPLACEMENT BORE SIZE COMP RATIO PART# MFG CODE NOTES PRICE
449cc 96MM 13:1 4835M09600 96 BORE - 450 class legal 187.00
469cc 97MM 13:1 247953 2 mm over. 167.53
478cc 98MM 13:1 247952 3 mm over. 167.53

YAMAHA ATV - YFM600 GRIZZLY 1998-01
DISPLACEMENT BORE SIZE COMP RATIO PART# MFG CODE NOTES PRICE
598cc 97MM STD 4797M09700 2 mm over. 169.23
634cc 98MM 10:1 4607M09800 3 mm over. 178.79

YAMAHA ATV - YFM660R RAPTOR 2001-'06
YFM660F GRIZZLY 2002-'07
RHINO 2005
DISPLACEMENT BORE SIZE COMP RATIO PART# MFG CODE NOTES PRICE
660cc 100MM 11:1 4737M10000 STD 174.31
666cc 100.5MM 11:1 4737M10050 .5 mm over. 174.31
660cc 100MM 11:1 261525

STD 181.66
673cc 101MM 11:1 4737M10100 1 mm over. 174.31
686cc   102MM 11:1 4811M10200 2 mm over. 191.76
686cc   102MM 12:1 261529 2 mm over. 181.66
727cc   105MM 11:! 261531

5 mm over. 181.66

YAMAHA ATV - YAMAHA RAPTOR 700 - 2006-2007, 2007-08 Grizzly, 2008 Rhino 700
DISPLACEMENT BORE SIZE COMP RATIO PART# MFG CODE NOTES PRICE
686cc 102MM 9.2:1 4902M10200 STD 146.53
699cc 103MM 9.2:1 4902M10300 1 mm over. 146.53
686cc 102MM 11:1 4903M10200 STD 186.16
686cc 102MM 12.5:1 247946 STD Disc.
699cc 103MM 11:1 4903M10300 1 mm over. 186.16
714cc 104MM 11:1 247947

2 mm over. Disc
714cc 104MM 12.5:1 247949

2 mm over. 167.53
727cc 105MM 10.75:1 M1041 3 mm over. Call or email for pricing.
727cc 105.5MM 12.5:1 247950 3.5 mm over. Call or email for pricing.