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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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1 X YAMAHA YZF 450 2003 - 2009 / WRF 450 2003 - 2015 TITANIUM CENTRE INTAKE VALVE

The valve that decides how cleanly your engine breathes in.

1 X YAMAHA YZF 450 2003 - 2009 WRF 450 2003 - 2015 TITANIUM OUTER INTAKE VALVE

The valve that decides how cleanly your engine breathes in.

1 X YAMAHA YZF 450 2010 - 2013 TITANIUM INTAKE VALVE

The valve that decides how cleanly your engine breathes in.

1 X YAMAHA YZF 450 2014 - 2019 TITANIUM INTAKE VALVE

The valve that decides how cleanly your engine breathes in.

2 X PROX EXHAUST VALVE SPRING KIT (2 X STEEL) YAMAHA YZ450F 2003 - 2009 / WR450F 2003 - 2015

The valve that decides how cleanly your engine breathes out.

2 X PROX EXHAUST VALVE SPRING KIT (2 X STEEL) YAMAHA YZF450 2014-2015

The valve that decides how cleanly your engine breathes out.

2 X PROX INTAKE VALVE SPRING KIT (2 X STEEL) YAMAHA YZF450 2014-2018

The valve that decides how cleanly your engine breathes in.

3 X PROX INTAKE VALVE SPRING KIT (3 X STEEL) YAMAHA YZ450F 2003 - 2009

The valve that decides how cleanly your engine breathes in.

9.48MM HOT CAMS SHIM KIT 1.20-3.50 IN 0.05MM INCREMENTS 3 OF EACH SIZE

The small parts that keep your valves precisely in tune.

AIR FILTER WRP YAMAHA YZF 250 2001-2013 YZF 450 2003-2009

The simplest way to add years to your engine's life.

AIR FILTER WRP YAMAHA YZF 450 2010-2013

The simplest way to add years to your engine's life.

AIR FILTER YAMAHA YZF450 2014-2017 / WRF450 2016-2018 PROX

The simplest way to add years to your engine's life.

AIR FILTER YAMAHA YZF450 2018-2022 / WRF450 2019-2023 PROX 52.24018

The simplest way to add years to your engine's life.

AXLE BLOCKS YZ 125 250 (99-08) YZF 250 (01-08) YZ 400 (99-00) YZF 426 (01-02) YZF 450 (03-08) WRF 250 (02-ON) WRF 426 (01-02) WRF 450 (03-ON) WR 250 R/X (07-ON) TITANIUM

A small part that keeps your whole drivetrain running true.

BLING KIT YAMAHA YZF250 YZF450 (2014-20) - BLUE

The finishing touch that makes a used bike look like new.

BLING KIT YAMAHA YZF450 2010-2013 BLUE

The finishing touch that makes a used bike look like new.

BODEEN CLUTCH COVER BOLT KIT YAMAHA YZF 450 2010-2018

Small bolts that finish the job properly.

Currently unavailable View product →

BOTTOM END REBUILD KIT YAMAHA YZF 450 2003 -2005

The kit serious rebuilders reach for when it's time to go deep.

BOTTOM END REBUILD KIT YAMAHA YZF 450 2006 - 2009

The kit serious rebuilders reach for when it's time to go deep.

BOTTOM END REBUILD KIT YAMAHA YZF 450 2010 - 2013

The kit serious rebuilders reach for when it's time to go deep.

BOTTOM END REBUILD KIT YAMAHA YZF 450 2014-2017 CBK0223

The kit serious rebuilders reach for when it's time to go deep.

BRAKE DISC (FRONT) YAMAHA YZ125 YZ250 2001-2016 / YZF250 2001-2015 / YZF426 / YZF450 2003-2015 / WRF250 2001-2016 / WRF426 / WRF450 2003-2015 BD13288

The part that decides how confidently you can brake into a rut.

BRAKE DISC (FRONT) YAMAHA YZ125/YZ250 2017-ON / YZF250/YZF450 2016-ON / WRF250 2017-ON / WRF450 2016-ON 37.BD12416 PROX

The part that decides how confidently you can brake into a rut.

BRAKE DISC (REAR) YAMAHA YZ125 YZ250 2002-2021 / YZF250 2202-2018 / YZF450 2003-2018 / WRF250 2002-2018 / WRF450 2003-2018 37.BD22202

The part that decides how confidently you can brake into a rut.

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