Honda CR250 CR250R 2005-2007 Service Manual

2007 marked the end of the road for the CR250R after 35 years of continuous production — a run stretching back to the original 1973 model that helped define Honda's motocross reputation. The 2005-2007 bikes represent the third and final chassis generation, running a thinner, more flex-tuned aluminum frame than the original 1997 twin-beam design that made Honda the first manufacturer to bring aluminum chassis technology to motocross.

Power comes from the 249cc liquid-cooled two-stroke single, running an electronically controlled RC valve system, with an 8.5:1 compression ratio through a 66.4mm x 72mm bore and stroke. The engine architecture carried over largely unchanged from the significant 2002 revision, which had introduced a completely new powerplant with a Throttle Position Sensor added to the carburetor. Some longtime CR owners and forum discussion have noted the 2005-2007 engines ran hotter and more prone to pinging on pump gas than earlier iterations, a trade-off some attribute to head-shape revisions made trying to address a perceived bottom-end power deficit introduced back in 2002.

Suspension consists of a 47mm cartridge-type inverted Showa fork with 315mm of travel, fully adjustable for compression and rebound, paired with a Pro-Link rear shock offering 320mm of travel and adjustable low- and high-speed compression and rebound damping. A single 240mm disc handles braking front and rear. Dry weight sits around 213 lbs, with a 58.3-inch wheelbase and a genuinely tall 37.1-inch seat height, reflecting the bike's pure competition intent. Standard features include a washable two-stage foam air filter, a repackable silencer, and a removable rear subframe for easier maintenance — details aimed squarely at racers doing their own wrenching between motos.