The Castle Combe test was the first time that 20-time Isle of Man TT winner McGuinness has ridden on track since breaking his wrist in training just over six weeks ago.
Since then, the Morecambe missile has been undergoing intensive physiotherapy and was able to quickly regain his confidence aboard the Fireblade SP.
“It’s great to get together with my road racing team, who are like family to me. It was looking like we weren’t going to get much done on Wednesday but all of a sudden the sun came out and we got a day’s work done in the afternoon,” he told Bike Sport News.
“I made a massive step forward with regards to getting on the bike after my injury. After my enduro crash I thought my season was over so I’m made up with how good I felt on the bike.
“I’m going home feeling much more confident about the North West and the TT and I can’t wait to ride my Fireblade in anger again.”