Honda have almost finished construction of their 2017 power unit as they continue their iron out their switch of focus to 2017.
Honda last introduced an engine upgrade at the Malaysian Grand Prix and since then have been looking at improving the engine for next season.
"The concept is nearly finished," head of F1 project Yusuke Hasegawa said. "We have started engine testing on the dyno for 2017, so we will continue to improve performance through testing until very close to next season. We cannot go into any details at this point."
"Some of the development that we have put into effect in 2016, like weight reduction and reliability updates will always be useful in any situation.
"Though we cannot go into technology specifics for 2017, the overall power unit regulations will not change drastically, so many things we learned from 2016 can be used as fundamental technology and data for 2017."
Bahrain International Circuit - Winter testing