Morbidelli was involved in a red flag incident on the first lap of the sprint race at Jerez at Turn 2 when he made contact with Alex Marquez, with Marco Bezzecchi also involved.
Then on the first lap of the grand prix on Sunday, Fabio Quartararo on the other Yamaha collided with Miguel Oliveira after the Frenchman was squeezed between the RNF rider and Bezzecchi.
There have been first-lap collisions in three of the first four sprints and three of the opening four grands prix, with Enea Bastianini, Miguel Oliveira, Marc Marquez and Joan Mir finding themselves injured as a result.
Morbidelli believes Michelin’s front tyre has “a weak point”, in that “the performance drops” when it gets too hot, and this is leading to “crazy” first laps as riders look to gain as many positions as possible before getting stuck.
“We need to start thinking deeply about this, because there was another red flag, another scary moment, another dangerous moment,” Morbidelli said.
“Michelin, they need to work on this, they need to solve this thing. The regulations, the technology, need to be at the same level in all areas. Right now it looks like the bike technology outweighs the tyres.
“The tyres are good, but they have a weak point, that in hot conditions the performance drops and everything goes according to the front temperature and the front pressure.
“The bikes are fantastic... and when conditions are cold, the performance of the tyre is great, they are unbelievable.
“But they have this big weak point, so they have to push to fix this problem because it’s a big one.
Source: Autosport