Honda is facing a tough challenge as it works on its new Formula 1 power unit for 2026. The Japanese manufacturer has enjoyed great success with Red Bull and Racing Bulls, winning 68 races, four Drivers’ Championships, and two Constructors’ titles since their partnership began in 2018. But with new engine regulations on the horizon, Honda is preparing for a fresh start with Aston Martin—and the development process has been anything but easy.

From 2026, F1 will continue using hybrid power units, but with significant changes. The removal of the MGU-H, the introduction of fully sustainable fuels, and a greater reliance on electric power will reshape engine performance.

The new regulations require an even split between the 1.6-litre turbo V6 and battery power, a shift that has proven particularly difficult for Honda. Honda Racing Corporation (HRC) president Koji Watanabe admitted the company is struggling to keep up with the demands of the new rules.

“We are struggling,” Watanabe told PlanetF1.com.

“Now we are trying our best to show the result next year.

“Everything is new. The motor is a new 355-kW, very compact one we need.

“Also, the lightweight battery, it’s not so easy to develop.

“And also the small engine with the big power. Everything is very difficult, but we try our best.”

Honda initially planned to exit F1 in 2021 but later extended its partnership with Red Bull. However, from 2026, Red Bull will develop its own power units with Ford, while Honda will power Aston Martin as a works team.