Josh Brookes says new parts on his Milwaukee Yamaha R1 machine were the key to destroying his previous lap record around Snetterton during the first day of the MCE British Superbike mid-season test.

The Australian smashed his old record at the Norfolk circuit by over 0.7 seconds with a 1m 47.176s lap. Brookes says his feeling with the 2015-spec YZF-R1 has improved significantly thanks to a new fuel tank.

Along with the significant one lap gains Brookes hopes the new part with improve his race pace, particularly in the opening stages with a heavy fuel load.

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"We had a new tank to test, at the start of the races it has been difficult and we can't afford to give anything away or give the other guys a breather at the beginning of the race," Brookes said. "If you take that into consideration you think it should only be the start of the race that is affected, but as it turns out the bike is better in every way anyway just by putting the fuel tank on. It felt more stable and I had good results from it."

Even though the Yamaha rider anticipated an increase in performance he admitted the level of improvement came as a welcomed surprise.

"It took me by surprise to have such an improvement," he said. "It really changed the bike and it was nice to feel the difference. I was pushing to make the lap but I was riding in a relaxed and calm way to do it too, so I am happy with that and we can look forward to."

The Snetterton test concludes today (Wednesday) where Brookes will be hunting further gains to maintain the gap between him and the chasing pack.

Defending British Superbike champion Shane Byrne ended the day second on the timesheet despite stopping on track due to a technical fault with his PBM Kawasaki in the final stages of the day.

Tyco BMW pair Michael Laverty and Tommy Bridewell are skipping the two day test as the team prepares for the Isle of Man TT, while four-time champion Ryuichi Kiyonari is also absent for the Norfolk test.

The test also saw the return of injured duo Dan Linfoot for Honda Racing and Peter Hickman for RAF Reserves BMW.