The Yamaha Raptor 660 remains one of the most recognizable sport ATV platforms because riders continue rebuilding and keeping them on the trail instead of replacing them. Years of higher RPM riding, aggressive acceleration, heat cycles, and normal wear can gradually show up through harder starts, lower compression, oil consumption, smoke, or performance that no longer feels as sharp as it once did.

REV6 rebuilds the Yamaha Raptor 660 using a build core process, which means your engine must arrive at our facility before inspection and rebuild work begins. Many customers choose this route because rebuilding the original engine helps retain fitment and keeps the project moving with known components. Every engine moves through teardown, evaluation, rebuild work, careful assembly, and final quality checks before shipment. Current REV6 rebuild details include rebuilt crankshaft service, cylinder evaluation, piston replacement, cylinder head rebuilding, timing component inspection, oil pump refurbishment, and complete gasket and seal replacement.

Every rebuilt engine includes our industry-leading 1-year no-fault warranty, with the option to upgrade to a 2-year no-fault, no-questions-asked warranty. Tracking information is provided after shipment so you can stay informed through delivery.