PBM Aprilia's Michael Laverty fell foul of a mystery crash on lap two of Laguna Seca's MotoGP round and is still at a loss for what caused it.

The Ulsterman had gone from 20th to 15th on the first lap but when he came to the tight turn two, he lost the front even though nothing had been done differently.

"It's a long way to come to Laguna Seca for only one racing lap. We had improved our set up with every session throughout the weekend and I felt my best on track during morning warm up. I got a really good start and had a good battle with Hector Barbera on the opening lap," said Laverty.

"As I entered turn two on the second lap the front just simply washed out, it definitely caught me off guard as I wasn't struggling to stop, everything felt quite settled on entry but down I went nonetheless. We have the summer break now before Indy so it gives us a good chance to evaluate all the work done so far this season and make a plan to improve over the second half of the season."