The newer engine has an 81mm bore, 65mm stroke, and a compression ratio of 12.5:1. Each cylinder has its own dual-injector electronically governed throttle body for precise fuel delivery and aluminum alloy pistons and titanium valves to reduce weight. The connecting rods have been lightened by three grams each as well.
The air intake passages in the fairing were also reconfigured, funneling more cooling air to the engine while the bike is in motion. The exhaust system on the newer engine is 4.5 pounds lighter than the old version while also being better at filtering out harmful greenhouse gases. Suzuki extended the air intake pathway by 12mm to make the Hayabusa stronger at low RPMs.
The newer engine produces 187 horsepower and 100 lb-ft of torque (up from the original motor’s 175 hp and 102 lb-ft). Zach Court of Revzilla test rode a 2023 model and wrote that the engine “has always been the crown jewel of the Hayabusa, and even saddled with all of the emissions hardware and rider aids that are requisite on bikes today, the powerplant is stellar. It mumbles a gentle baritone at idle, and it’s truly as polite as any engine could be at low speed.”
