Honda F1 motorsport boss Yasuhisa Arai has confirmed his team's plan to use a number of its engine tokens in the run up to the Belgian Grand Prix to introduce a new specification of its power unit.

After the Japanese firm made its much-anticipated return to Formula 1 with McLaren it has struggled to find a successful package under the current regulations, which has seen the team hampered by persistent reliability problems and be considerably off the pace with the Honda RA615H Hybrid power unit.

Despite a difficult start to the season McLaren enjoyed brief respite at the Hungaroring when Fernando Alonso and Jenson Button claimed the Woking-based team's first double points haul of the season.

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Arai says Honda is looking to focus on improving the combustion efficiency of its current power units and will use engine tokens to produce a new exhaust system and a new gearing setup. McLaren Honda has seven engine tokens remaining which can be used throughout the year to introduce updates on the MP4-30.

"The most important area for us to concentrate on is the combustion," Arai said. "Current regulations require high efficiency of the combustion so we want to change the characteristic with the chamber design and intake and exhaust system layout.

"Another issue we will be addressing is reducing mechanical friction by changing the gear train system along with the combustion."

The Honda boss ruled out guaranteeing all of its power unit updates would be implemented immediately after the summer break at Spa (21-23 August) but would be in place over the coming weeks.

"Not all of our upgrades will be in place for the Belgium Grand Prix, some parts will be applied for Spa and the rest during the weeks that follow," he explained. "Our plan is to keep improving race-by-race for the remainder of the season.

"Going into the second half of the season, knowing that we are progressing is reassuring. I am confident that our reliability problems are now behind us which means we can turn our attention to increasing power."