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YZF 450

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YZF 450

YZ450F Engine The YZ450F engine is a four-stroke DOHC engine that was first released in 2003. It is based on the earlier YZ426F engine but with several key changes that improve performance and durability. The most notable change is the addition of fuel injection, which replaced the carburettor in p... show more

YZ450F Engine

The YZ450F engine is a four-stroke DOHC engine that was first released in 2003. It is based on the earlier YZ426F engine but with several key changes that improve performance and durability. The most notable change is the addition of fuel injection, which replaced the carburettor in previous models. Other changes include a larger bore and stroke, a higher compression ratio, and revised intake and exhaust porting. The result is an engine that is more powerful and efficient than its predecessors, and can better withstand the rigors of competitive use.

Since its introduction, the YZF450 engine has been continually updated to keep it at the forefront of motocross technology. In 2007, a new crankshaft and connecting rods were introduced to improve durability. 2008 saw the addition of a cylinder head with revised intake and exhaust porting, and larger valves. 2009 brought a new combustion chamber design, higher compression ratio, and lighter piston. These changes resulted in an increase in power of approximately 5%.

YZ450F Engine Parts

To keep your Yamaha YZ450-F in peak condition, use top aftermarket brands to enhance and maintain your bike - at a fraction of the cost of OEM. These parts meet or exceed OEM specs so you can be confident they’ll stand up to the demands of racing. So when it comes time to rebuild or replace an engine part, you can find everything you need here at www.motocrosspartsuk.com.

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REAR SHOCK BEARING KIT (LOWER) YAMAHA YZF250 WRF250 / YZF426 WRF426 2001-2002 / YZF450 WRF450 2003-2024

A small bearing with a big say in how the rear end feels.

REAR SHOCK BEARING KIT (UPPER) YAMAHA YZF250 / YZF450

A small bearing with a big say in how the rear end feels.

REAR SHOCK SEAL HEAD KIT YAMAHA YZ125 YZ250 2006-2022 / YZF250 2006-2011 / YZF450 2006-2009 37-1117

Stops a small leak becoming a shock that needs a full rebuild.

REAR SHOCK SEAL HEAD KIT YAMAHA YZ125/YZ250 1993-2005 / YZF250 2001-2005 / YZF400 1998-1999 / YZF426 2000-2002 / YZF450 2003-2005 / WR250 1994-1997 / WRF250 2001-2014 / WRF400 1998-2000 / WRF426 2001-2002 / WRF450 2003-2018

Stops a small leak becoming a shock that needs a full rebuild.

REAR SHOCK SEAL HEAD KIT YAMAHA YZF250 2014-ON / YZF450 2010-ON / WRF250 2015-2019

Stops a small leak becoming a shock that needs a full rebuild.

SAMCO SPORT 3 PIECE OEM COOLANT HOSE KIT YAMAHA YZF 450 (2014 - 2017) - BLUE

Don't let a cracked hose cook the engine you just rebuilt.

SAMCO SPORT 4 PIECE COOLANT HOSE KIT YAMAHA YZF 450 (06-09) WRF 450 (06-11) - BLUE

Don't let a cracked hose cook the engine you just rebuilt.

SAMCO SPORT OEM 4 PIECE COOLANT HOSE KIT YAMAHA YZF 450 (10-13) - BLUE

Don't let a cracked hose cook the engine you just rebuilt.

SM PRO PLATINUM (FRONT) YAMAHA WHEEL 2007-2017

Everything else on the bike works better with grip underneath it.

SM PRO PLATINUM MOTOCROSS (REAR) WHEEL - YAMAHA BLUE BLACK BLUE

Everything else on the bike works better with grip underneath it.

SPROCKET BOLT SET YAMAHA (REAR) 6 PIECES 8X25 BY PROX

Small bolts holding together a lot of power.

SUPERCOOLER WATER PUMP AND IMPELLER KIT YAMAHA YZF450 2010-2013 BOYESEN

Keeps temperatures under control when the going gets demanding.

SUPERCOOLER WATER PUMP AND IMPELLER KIT YAMAHA YZF450 2014-2019 BOYESEN

Keeps temperatures under control when the going gets demanding.

SUPERSPROX FRONT GROOVED SPROCKET YAMAHA YZ250 (99-24) YZF450 (03-24) WRF450 (03-24) CST-565

Never replace just one part of the drivetrain - it wrecks the rest fast.

SUPERSPROX REAR ALUMINIUM SPROCKET YAMAHA YZ125/250 YZF250/450 WR125/250/250X WRF250/450 BLACK

Never replace just one part of the drivetrain - it wrecks the rest fast.

SUPERSPROX REAR ALUMINIUM SPROCKET YAMAHA YZ125/250 YZF250/450 WR125/250/250X WRF250/450 BLUE

Never replace just one part of the drivetrain - it wrecks the rest fast.

SUPERSPROX REAR ALUMINIUM SPROCKET YAMAHA YZ125/250 YZF250/450 WR125/250/250X WRF250/450 BRONZE

Never replace just one part of the drivetrain - it wrecks the rest fast.

SUPERSPROX REAR STEALTH SPROCKET YAMAHA YZ125 YZ250 WR125/200/250/500 BLUE RST-245-BLU

Never replace just one part of the drivetrain - it wrecks the rest fast.

SWING ARM BEARING KIT YAMAHA YZ125/YZ250 1999-2001 / YZF250 2001 28-1073

The bearings that decide how connected the rear end feels.

SWING ARM BEARING KIT YAMAHA YZ250 2006-2022 / YZF250 2006-2013 / YZF450 2006-2009 / WRF250 2006-2014 / WRF450 2006-2015 28-1158

The bearings that decide how connected the rear end feels.

SWING ARM BEARING KIT YAMAHA YZF250 2002-2005 / YZF450 2003-2005 / WRF250 2002-2005 / WRF450 2003-2005 28-1072

The bearings that decide how connected the rear end feels.

THROTTLE CABLE YAMAHA YZF450 2014-2016 / WRF450 2016-2018 ALL BALLS

One of the simplest ways to sharpen how a bike feels to ride.

THROTTLE CABLE YAMAHA YZF450 2017

One of the simplest ways to sharpen how a bike feels to ride.

THROTTLE CABLE YAMAHA YZF450 2018-2022 / WRF450 2019-2023 45-1265

One of the simplest ways to sharpen how a bike feels to ride.

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