Current Build
2010 Yamaha YFZ450R OEM+ Refresh
A family machine that came in totally defunct — frozen throttle, seized starter, cut wiring, and years of deferred shortcuts. Stripped down, sorted properly, and brought back to a standard worth documenting.
Phase 1
Condition at Intake
What the machine arrived with. Nothing was assumed to be functional until proven otherwise.
Issues Found
Throttle cable broken — throttle plate frozen wide open
One-way starter bearing seized
Clutch assembly worn out: cable, actuator pin, actuator arm, discs, gaskets, and springs
Grips torn and deteriorated
Exhaust held on with a single bolt
Oil drain plug stripped
Plastics damaged with missing mounting brackets — held together with zip ties
Battery wiring and solenoid in unknown condition
Non-stock aftermarket starter button installed
Nerf bar nets zip-tied in place
Heel guards broken
Wiring cut and spliced throughout the harness
Missing Parts
Headlights
Rear grab bar
Plastics hardware, bumper, and miscellaneous fasteners
OEM start/light control switch
Phase 2
Mechanical
Worked through each system in order — nothing cosmetic until the machine ran correctly.
Replaced throttle cable. Soaked and freed the throttle body plate, lubricated and reassembled.
Full teardown and inspection. Replaced one-way starter bearing and all associated gaskets.
Repaired stripped oil drain plug.
Replaced battery, wiring, and solenoid with new components.
Drained, flushed, and changed oil and filter.
Validated cold start and run.
Addressed full wiring harness: soldered connections throughout, installed OEM lights and start/light switch, wired light bar correctly. Labeled and rebundled the harness.
Full clutch replacement: cable, actuator components, discs. Break-in and adjustment.
New exhaust installed and tuned with fuel controller.
Phase 3
Refresh the Look
OEM+ cosmetic work — correct parts, correct fitment, no shortcuts.
Replaced torn grips
Replaced broken and spray-painted nerf bars
Replaced damaged plastics
Installed OEM brackets and rear grab bar
Replaced missing hardware and stripped or broken fasteners throughout
Full detail and clean
Completed Build
