Jack Miller made a strong start to his KTM career by being the fastest Moto3 rider during Thursday's private test at Jerez.

Riding alongside new Red Bull Ajo Moto3 team-mates Danny Kent and Karel Hanika, Mahindra - plus much of the Moto2 field - Miller set the 250cc pace with a 1m 47.291s.

"It was a good first day of testing," said the young Australian, who finished seventh overall and the top Honda rider in this year's championship. "We've made some great changes and put in many laps, and in the end we found a good first setup. We will have to keep working on it, because it is clear that today is only the first day with this bike.

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"I feel very comfortable with the KTM, both with the engine and the chassis. I expected it to be more difficult to adapt, but the truth is that it went pretty well. We have to keep working, but I'm happy with how everything is going so far."

Red Bull Rookies champion Hanika also impressed, setting the second fastest time.

"The truth is that the bike that I rode today is different to that which I was used to, so I need to put in more kilometres to go faster," said the Czech. "Anyway, I think we made a significant step forward. I worked hard, changing various settings and found solutions that allowed us to go faster and faster. I can't wait to get back on the KTM and have another good day of testing. The team did a great job; I'm very happy."

Kent is returning to the team, and class, after a tough season in Moto2 with Tech 3. The Englishman is also recovering from a broken collarbone that ruled him out of last weekend's Valencia finale.

"The first day of my return to Moto3 didn't go at all badly," said Kent, who was fifth quickest. "For now we are ignoring the lap times and are only focusing on getting the feeling back with the KTM. This bike is faster and the chassis is different from what I am used to riding.

"I was not able to ride as fast as I wanted, because I'm still suffering with a sore shoulder from the break in Japan, and I am a little sad about that. For a first day, it was not bad. We have to keep working hard. I'm happy with how the day went, to be returning to this great team and this group of professionals who support me."

Testing continues on Friday.