Monster Yamaha's James Toseland reckons that using an old engine during first MotoGP free practice at Sepang today hampered his performance, especially with straight-line speed.

The former World Superbike Champion finished in 15th place, a second and a half behind team-mate Colin Edwards, but says that a new engine and some setup changes will help tomorrow.

“It has been a tough start but I knew it would b e because I was running an old engine today and that had a big impact on our performance. For the rest of the weekend we'll have a fresher motor in that should help because I was quite far down the speed charts," said the Yorkshireman.

"But I was struggling for side grip this afternoon. I'm running more corner speed to make up for the loss in acceleration and that is wearing the rear tyre quite quickly. And during that session we couldn't find the side grip I needed to go faster. We've gained a lot of data though and I'm sure with a few ideas that my guys at Tech 3 have, I'll be in better shape tomorrow."
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