Honda says it is still not satisfied with the progress it has made with its power unit, despite making a significant step on last year.

McLaren-Honda has scored just one point this year, but performance and reliability have improved in the partnership's second year. Honda F1 boss Yusuke Hasegawa is confident progress will be made, but admits the current situation is not good enough.

"It is too soon to say the exact number or positions [we can gain this year] but obviously we're not happy and we're not satisfied with the current position," Hasegawa said. "We can improve definitely with a decent level of step-ups so we are happy about that.

"Of course it is coming from the chassis as well but we can contribute with the power unit. It is important to show that we can improve in the step-ups. This is our target so far."

Honda's main weakness last year was its turbo and MGU-H, but Hasegawa says the focus has now switched to the internal combustion engine.

"The ERS is much better than last year but we understand the internal combustion engine is still where we need to catch up the other teams. We are not satisfied with the situation, but we are happy to show improvement."