Yamaha Racing boss Lin Jarvis has confirmed that their lease engines will cost £683,000 per rider, per season for 2014 and will be available to four entrants.

Jarvis said the motors will be similar to those used by Cal Crutchlow's Monster Yamaha squad this year but will be able to use 24-litres of fuel and use the Magneti Marelli spec-ECU.

When asked about which teams would be in the frame for the engines, Jarvis wouldn't be drawn but said it would be Yamaha's preference to have two, two-rider teams.

"We would prefer to have two-rider packages because it is easier for us to work with. The reason we decided to lease is because we will put our latest technology in those engines, so the engines we will provide will be pretty similar to the Tech 3 engines," said Jarvis.

"That is top level technology and we don’t want that technology to come into third parties’ hands, so that is why we have to lease because at the end of the year we will take back everything. In fact, with the engines we provide, we will do all of the reconditioning of the engines ourselves.

"Together, Yamaha and Dorna will decide which will be the selected teams. The team has to make the contract and the relation with the chassis supplier, but obviously to do that the chassis supplier needs to understand what Yamaha will provide.

"So in the back office we have been discussing with all three current chassis manufacturers that are out there, whether it be Kalex, FTR or Suter, all three are top-level companies and I am sure they are all very capable of making a competitive chassis.

“We have been talking to several teams already. The target deadline for us is the end of June; we will need a decision by then because we have to produce and manufacture all of the engines to be ready for testing at the end of the season. The next five weeks will be critical in deciding what next year’s programme will be.”