the 2004 version Black plastics color scheme option added 2006 Electric start models added along with kick start models. Engine compression raised from 10.5:1 to 12:1 Engine bore increased to 96 mm and stroke lowered to 62 mm Maximum engine rpm is raised from 9800 to 9850 New transmission ratios designed for racing applications and trail use Swing arm extended to help alleviate the "bucking" of the previous models. The "bucking" should be able to be tuned out with the correct (for the riders weight) spring. And by tuning the compression / rebound. Rider position is lowered by 8 mm Rear suspension travel is extended from to Head light changed to a more "race-derived look". Front knuckles changed making the front end "push". Extending the swing arm will affect the front end. = "push" Angle of engine changed. 2007 New White and Black/Flame colors on the electric start version 2008-2014 New Black/Blue color joins White on the electric start version Style of and reposition of the auto decompression feature to other side of cam carrier Black Wheels became an option with the Orange Frame/White plastics Gas tank capacity decreased to 2.6 Gallons and addition of body plastic over tank. 2014 was the last year of production for the trx 450r References TRX450R