From a Marlboro Yamaha press release:

MARLBORO YAMAHA TEAM TESTS
Mugello, Italy
Thursday May 9 2002

RAINY MUGELLO TESTS PROVE INCONCLUSIVE FOR MARLBORO YAMAHA

Marlboro Yamaha Team riders Carlos Checa and Max Biaggi today completed a two-day test at Mugello, Italy, where they evaluated more development parts for the YZR-M1’s electronically controlled engine-braking system. But rain spoiled much of the session and it was only during the last hour of today that they were able to run slick tyres, so results remain inconclusive. Now the team crew travel to Le Mans where they will test the parts more fully during practice and qualifying for next weekend’s French Grand Prix.

“The rain hasn’t been a big help to us but at least I managed to test the chassis in the wet for the first time,” smiled Checa. “We finally had a dry track for the last hour or so, though that wasn’t enough to properly test the new parts. Now I’m just looking forward to trying them at Le Mans, where I hope the weather is better.”

Biaggi said: “We couldn’t really push out there until the last hour, so I can’t say much about the parts, but the data we’ve gathered here should be useful for our Japanese technicians.”

Marlboro Yamaha Team director Davide Brivio added: “We couldn’t do much in these conditions but it was better than nothing. We will really have to wait until we get to Le Mans to properly evaluate the new parts.”

French GP practice and qualifying commence on Friday May 17, with racing on Sunday May 19. Last year Biaggi and Checa scored a resounding one-two at Le Mans, riding their YZR500s.