New

Dual cam engineImproved mid range and good top-end power gainUses stock valve springsWill work well with aftermarket exhaustUses Hot Cams shim kit HCSHIM02

Designed to match OEM in appearanceCast from AB4C aluminum with nikasil plated sleeves for excellent wear and durability AT-09477 and AT-09478 require no case modification when installing

Contains all the necessary components for overboring or rebuilding your top endFeature forged pistons, rings, wrist pins, circlips and top end gasket set

Contains all the necessary components for overboring or rebuilding your top endFeature forged pistons, rings, wrist pins, circlips and top end gasket set

WISECO COMPLETE CRANKSHAFT ASSEMBLIES.* All new assembly.* Crankshafts are sold complete with Wiseco connecting rods and inner crankshaft webs.* Factory assembled and trued to within .001.* Ready for installation.* Crankshafts are completely rebuildable...

 Stage 3 exhaust: Dual cam motor. Excellent top-end increase. Uses stock valve springs. Includes auto decompression mechanism.

 Stage 1: single-cam motor. Excellent midrange and top-end power increase. Uses stock auto-decompression mechanism. Uses stock valve springs.

 Stage 3: single-cam motor. Significantly more top-end power than Stage 2. Will work well for Supermoto and big bore/strokers. Uses stock auto-decompression mechanism. Uses stock valve springs.

 Stage 1: Dual cam engine. Intake and exhaust sold as a set. More midrange and top-end than the MUDBUSTER. Improved power through entire RPM range over stock. Uses stock auto-decompression mechanism. Uses stock valve springs and rockers.

 TRX 400EX Stage 2: single-cam motor. More top-end power than Stage 1 with midrange gain. Uses stock valve springs and rockers. *Does not use auto-decompression mechanism. Stock starter sufficient.

 Stage 2: single-cam motor. Excellent midrange and top-end increase. Designed specifically for the Hot Rods stroker crank and piston kit 4143 and P3001. Uses stock valve springs and rockers.

OE Part Number(s):HONDA: 13000-HP1-670HONDA: 13000-HP1-671HONDA: 13090-HP1-315For Models:2004 - 2005 Honda TRX 450ER, 2004 - 2005 Honda TRX 450R