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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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HOT RODS YAMAHA YZF450 2003-2013 / WRF450 2003-2015 WATER PUMP SHAFT

A small shaft that keeps your whole cooling system turning.

HOT START PLUNGER KIT YAMAHA YZF250 2003-2013 / YZF450 2003-2009 / WRF250 2003-2013 / WRF450 2003-2011 46-2003

The small part that saves you a lot of kicking.

LINKAGE BEARING AND SEAL KIT YAMAHA YZF250 2006,2008 / YZF450 2006-2008 / WRF250 2007-2014 / WRF450 2007-2015

Smooth rear travel starts with the bearings that make it possible.

MASTER CYLINDER REBUILD KIT (FRONT) YAMAHA YZ125 YZ250 2008-2024 / YZF250 YZF450 2008-ON / WRF250 2017-ON / WRF450 2016-2022

Fix it before it fails you mid-lap.

MASTER CYLINDER REBUILD KIT (FRONT) YAMAHA YZF250 2001-2007 / YZF426 2001-2002 YZF450 2003-2007 / WRF250 2001-2016 / WRF426 2001-2002 / WRF450 2002-2015

Fix it before it fails you mid-lap.

MASTER CYLINDER REBUILD KIT (REAR) YAMAHA YZ125/YZ250 2003-2024 / YZF250/YZF450 2003-24 / WRF450 2003-2015

Confidence at the rear pedal, restored from the inside out.

MDR AIR FILTER BOLT 70MM YAMAHA YZ 125/250 (96-07) YZF 250 (01-07) YZF 400 YZF 426 YZF 450 (03-07) WRF 250

A tiny part that protects a very expensive engine.

MDR AXLE BLOCKS YZF 250 (14-ON) YZF 450 (14-ON) BLUE

A small part that keeps your whole drivetrain running true.

MDR BLING KIT YAMAHA YZF 450 (06-09) WRF (05-11) - BLUE

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

MDR CLUTCH KITS YAMAHA YZF 450 (03-04)

Most riders replace the full kit, not just one worn plate.

MDR CLUTCH KITS YAMAHA YZF 450 (05-06)

Most riders replace the full kit, not just one worn plate.

MDR CLUTCH KITS YAMAHA YZF 450 (07-13)

Most riders replace the full kit, not just one worn plate.

MDR COMPLETE GASKET SET YAMAHA YZF 450 (2003-2005)

One kit, every seal, no repeat trips to the parts counter.

MDR COMPLETE GASKET SET YAMAHA YZF 450 (2010-ON)

One kit, every seal, no repeat trips to the parts counter.

MDR FORGED ALUMINIUM GEAR LEVER RM 125 89-08 RM 250 89-93 YZF 250 01-05 YZF 450 03-05 WRF 250 450

Positive gear changes, restored in minutes.

MDR FORGED STEEL FOOTPEGS HONDA CR125/250/500 YAMAHA YZ80/85/125/250 YZF250/450 WRF250/450 WR/YZF400

The contact point that decides how connected you feel to the bike.

MDR FORK SEALS CRF 250/450 KX 125/250 KXF 250/450 RMZ 250 YZ 125/250 YZF 250/450

Smooth, predictable forks, restored in one afternoon.

MDR FRONT BRAKE DISC SUZUKI RM 125 250 (89-12) YAMAHA YZ WR 125 250 (01-16) YZF 250 (01-15) WRF YZF 450 (03-15)

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

MDR FULL FLEX BRAKE LEVER KAWASAKI, SUZUKI & YAMAHA

The part most likely to need replacing after a get-off.

MDR FULL FLEX BRAKE LEVER KXF 250 (13-ON) KXF 450 (13-ON) YZ 125 250 (08-ON) YZF 250 450 (07-ON)

The part most likely to need replacing after a get-off.

MDR FULL FLEX BRAKE LEVER KXF 250 (13-ON) KXF 450 (13-ON) YZ 125 250 (08-ON) YZF 250 450 07-ON BLUE

The part most likely to need replacing after a get-off.

MDR FULL FLEX CLUTCH LEVER KAWASAKI, SUZUKI & YAMAHA

Gets your clutch hand back to full control.

MDR FULL PLASTIC FASTENER KIT YAMAHA YZF 250 450 (14-ON)

Small fasteners that finish a plastics refresh properly.

MDR KICK START PEDAL YAMAHA YZF 450 (11-ON) - BLUE

WAS £79.99 £69.99

The part that turns a hard morning start into an easy one.

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