Aleix Espargaro had expressed doubts about the potential of Forward Racing's own frame relative to the Yamaha version, but was pleasantly surprised after trying it out in Monday's Catalunya test.

"It was better than I expected," said the Spaniard, dominating the new Open class with a 2013 Yamaha chassis, swingarm and engine package.

"I liked it a lot in the slow corners, I could brake late and it was turning better. But in the fast corners it was not turning like the Yamaha. But we did just 25 laps. The first test is good but we need to work a lot.

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"Then with my Yamaha bike we tried different settings and electronics and the new front tyre from Bridgestone. Anyway we will keep on working and I look forward to race in Assen, one of my favourite tracks."

Team-mate Colin Edwards changed over to the FTR-built frame at the last two events and continued development on Monday.

"Today we continued working on the chassis set up, playing with the geometry and we tested the new software updates from Magneti Marelli," said the Texan. "We also tested the new fuel tank. All in all it was a productive day of work. I was more comfortable with the bike and I look forward to race in Assen."

Espargaro set the ninth fastest lap time of the day, with Edwards in 19th.

A Yamaha chassis is not expected to be available for 2015.