CONTACT
SALES QUESTIONS? CONTACT US AT SALES@BIGBORETHUMPERS.COM

Crankshafts and Connecting Rods

Double forged connecting rods maintain superior dimensional consistency through improved grain fl ow. Shot peening eliminates residual stresses and smoothly blends the rod forging surfaces.
· Corrosion resistant surface treatment.
· Top end of rod is bushed for oil retention and eliminates pin gauling. The bottom end rod bores are case hardened to 58-62 RC to optimize bearing running surface.
· Precision engineered oiling slots maximize rod strength and bearing life.
· Double drilled small ends provide the piston pin with extra lubrication and cooling - Reducing distortion of top end due to thermal transfer from the piston.
· Silver coated bronze phosphor thrust washer, with dimpled design to increase oil retention and reduce friction between rod and washer interface.
· The crank pin bearings are manufactured from the highest quality, hot rolled steel. Case hardened to 58-62 RC.
· The caged needle roller bearings provide the highest possible RPM.

Crankshafts are sold complete with - Connecting rods, top-end bearings and inner crankshaft webs. Multi-cylinder applications come complete with main bearings (unless specified otherwise.) Pre-assembled and trued to OEM specifications. Ready for installation.

Connecting rod kits are sold complete with - Rod, crank pin, crank pin bearing and thrust washers.

HONDA 4-STROKE MOTORCYCLE
APPLICATION YEARS CRANK # CRANK PRICE ROD # ROD PRICE
CRF150R 2007 WPC149 $118.67 WPR204 $101.27
CRF250R 2004-2007 WPC143 204.97 WPR200 101.27
XR400 1996-04 NA NA WPR126 101.27
CRF450R 2002-03 NA NA WPR198 101.27
CRF450R 2004-06 WPC138 242.69 WPR198 101.27
CRF450R 2007 NA NA WPR198 101.27
XL600 1983-87 NA NA WPR127 101.27
XR600/XR600R 1985-00 NA NA WPR127 101.27
XR600 2001-04 NA NA WPR127 101.27

KAWASAKI 4-STROKE MOTORCYCLE
APPLICATION YEARS CRANK # CRANK PRICE ROD # ROD PRICE
KX250F 2004-06 WPC144 $204.97 WPR201 $101.27

SUZUKI 4-STROKE MOTORCYCLE
APPLICATION YEARS CRANK # CRANK PRICE ROD # ROD PRICE
RM-Z250 2004-2006 WPC144 $204.97 WPR201 $101.27
RMZ450 2005-2007 WPC142 242.69 WPR199 101.27

YAMAHA 4-STROKE MOTORCYCLE
APPLICATION YEARS CRANK # CRANK PRICE ROD # ROD PRICE
YZ250F 2003-05 WPC140 $196.80 WPR196 $101.27
WR250F 2003-05 WPC141 196.80 WPR196 101.27
YZ400F 1998-99 NA NA WPR203 101.27
YZ450F 2003-05 WPC139 242.68 WPR197 101.27
WR450F 2003-06 WPC145 242.68 WPR197 101.27

YAMAHA 4-STROKE ATV
APPLICATION YEARS CRANK # CRANK PRICE ROD # ROD PRICE
YFM350 XT WARRIOR 1987-04 WPC137 $281.42 WPR189 $101.27
RAPTOR350 2004-05 WPC137 281.42 WPR189 101.27
YFM600 GRIZZLY 1998-01 WPC148 296.47 NA NA
YFM660F GRIZZLY 2002-07 WPC148 296.47 WPR193 101.27
YFM660F RHINO 2004-07 WPC148 296.47 WPR193 (2005-06) 101.27
YFM660R RAPTOR 2001-05 WPC133 296.47 WPR193 101.27