Yamaha YFZ 450

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General

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The Yamaha YFZ450 is a high-performance, four-stroke ATV(All-Terrain Vehicle). Introduced in 2003 as a 2004 model, it was a huge leap forward relative to its competition.


Models

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• YFZ450
• 2006 - 2007 YFZ450 Bill Ballance Edition
  • Signature Series front grab bar, special graphics that include his signature and GYTR nerf bars.
• 2007 - 2008 Yamaha YFZ450 SE
  • GYTR front grab bar and heel guards plus special graphics

Model Year Changes

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2004

• First model-year, introduced all-new

2005

• Head de-compression plug eliminated

2006

• New crankshaft with increased stroke to 63.4mm (up from 62.0mm. This made it a true 449cc. Previously a 439cc engine
• Larger capacity radiator
• Titanium heat-shield
• Longer steering stem, revised handlebars, and thicker padding in seat
• Aluminum rear grab-bar replaces steel design
• Aluminum front bumper to replace steel design
• Replaced the twin-row bearing carrier swingarm with a round-housing swingarm which made adjusting the chain easier
• Twin-piston rear brake caliper
• LED taillight
• Revised head design (very slight difference, parts interchangeable among all years)
• Revised carburetion, and ignition timing
• New tire design
• Longer travel rear shock
• New front suspension settings

2007

• ProTaper aluminum handlebars
• Revised front brake master cylinder and lever
• Drilled rear brake disc
• Internal oil jet to lubricate piston bottom
• Improved clutch

Known Problems

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• Battery problems- YFZ batteries discharge after sitting for awhile, unable to recharge
• 2004 YFZ's have a rubber decompression plug that can pop out and cause your engine to seize.
• waterpump shaft seals leak overtime

Tech Tips

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