Shane Byrne has revealed his frustrations at the underperforming PBM Kawasaki bike before his triumphant return to form at Oulton Park.

The defending MCE British Superbike champion says he was left angry after race-winning pace appeared to simply disappear as he surrendered his lead to Josh Brookes.

Byrne had notched up four consecutive race victories at Snetterton and Knockhill before a difficult race weekend at Brands Hatch in which he crashed heavily during race one.

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After that off Brookes went on the claim six wins in a row while Byrne struggled to find answers to a lack of outright pace, with rumours swirling that he was riding with an imperfect bike frame.

The PBM Kawasaki team chose to completely rebuild Byrne's ZX-10R machine from scratch and it paid dividends as he claimed two race wins in the triple-header at Oulton Park to slash Brookes' lead to two points.

"I had been really frustrated and angry before Oulton Park because I knew I had worked as hard as I possibly could and was pushing to my maximum the whole time yet we had no speed," Byrne said. "For that to be the case it left us questioning where it had gone wrong."

Byrne says his team learnt a difficult lesson during that period and now feels galvanised to take the fight to Brookes at Assen this weekend.

"Whilst it hasn't been fun, it was good for us, it made us dig deep and with a completely new bike built and all our handling issues sorted we were instantly back in the game," he explained. "The last round was just what I needed on a personal level and showed that despite people questioning me and wondering if we had lost the plot, we were there and had never actually been away."

The four-time BSB rider says after rediscovering the winning combination he feels much calmer about the Showdown as he heads to a circuit which holds some fond memories. Byrne has taken two wins and two further podiums in the last six races he's contested at Assen.

"I am treating Assen as the next two races that we need to try and win," Byrne said. "I know how hard both myself and the team have been working. I'm feeling really relaxed and in the best possible place to start the Showdown."