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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


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MDR OIL FILTER COVER YAMAHA YZF 250 14-ON, YZF 450 10-ON
£24.45
A small cover that keeps engine oil exactly where it belongs.
MDR PLASTIC THROTTLE TUBE KXF250 (04-ON) 450 (06-ON) RMZ260 (04-ON) 450 (05-ON)
£11.21
The part that decides how naturally your right hand controls the power.
MDR PRO SERIES CNC LAUNCH MASTER YAMAHA YZ 125/250 YZF250/450 (04-ON) 63.4MM
£31.00
The upgrade for the two seconds that decide your whole moto.
MDR PRO SERIES MOTOCROSS FOOTPEGS YAMAHA YZ85/125/250 YZF250/450 WRF250/450
£95.70
The contact point that decides how connected you feel to the bike.
MDR RACE SERIES LINKAGE KIT YAMAHA YZ250F/450F 06-08 WR250F 07-12 WR450F 07-13
£76.39
Smooth rear travel starts with the bearings that make it possible.
MDR RACE SERIES LINKAGE KIT YAMAHA YZ250F/WR250F/YZ450F/WR450F 2005
£76.39
Smooth rear travel starts with the bearings that make it possible.
MDR RACE SERIES LINKAGE KIT YAMAHA YZF450R 09-13 YZF 450X 10-11
£76.39
Smooth rear travel starts with the bearings that make it possible.
MDR YAMAHA FACTORY BOLT KIT YZ/YZF/WRF (03-ON)
£49.90
The unglamorous kit that finishes every other job properly.
NGK CR8EIX IRIDIUM SPARK PLUG
£16.05
Cheap insurance, fitted while everything else is open.
OIL FILTER YZF250 YZF450 2009-ON / WRF250 WRF450 2009-ON
£5.95
The cheapest insurance your engine will ever get.
OIL SEAL SET YZF450 2014-2022 / WRF450 2016-2021 822692
£47.25
The unglamorous parts that keep everything else properly sealed.
PROX CLUTCH KIT (COMPLETE KIT) YAMAHA YZF450 2003-2006 / WRF450 2004
£125.51
Most riders replace the full kit, not just one worn plate.
PROX CLUTCH SPRING KIT YAMAHA YZF450 2007-2017 / WRF450 2016-2018
£26.38
Sometimes all a slipping clutch needs is fresh springs.
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