MotoGP world champion Marc Marquez is evaluating racing last year's Honda bike following his difficult start to the 2015 season.
The Spanish rider, who won the opening 10 races of the 2014 season, has won just once so far in seven races this year.
Marquez has also fallen three times in the last five races as he tried to fight with the Yamahas, which appear superior this year.
The Honda rider has now started testing last year's chassis frame with this year's swingarm, engine and exhaust.
Although today's post-Catalan Grand Prix test was hit by rain and allowed Marquez to complete just three runs, the Spaniard admitted he was feeling positive and suggested it could be the way forward for him.
"We didn't have much luck with the weather today, it started to rain very early on and we could only do three runs," said Marquez.
"The important thing is that the one point we did try – last year's chassis with this year's swingarm and engine gave us a positive feeling.
"We have to confirm our findings and compare the telemetry, because it wasn't a huge step forward and we couldn't do many laps, but the first impressions were good.
"The rain interrupted our work, but we'll see if we can continue working in this way because I'm feeling better on the bike all the time."
Marquez, who is 69 points behind championship leader Valentino Rossi, managed a total of 20 laps today and finished fourth fastest.