The planned three-day shakedown of the new Gresini Racing CRT MotoGP bike came to an early end when it was discovered that modifications to the bodywork were required.

Michele Pirro gave the FTR-Honda its track debut at Imola on Friday, but was forced to end testing on Saturday due to the belly pan grounding once speed increased.

GPOne.com quotes team principal Fausto Gresini as saying: "The bike is very new and it's normal that there are some problems. The belly of the fairings is hitting the track in certain sections, and to modify it you must make changes to the bike itself."

The decision to end testing was made in order to give as much time as possible to complete the redesign before the official Jerez MotoGP test, which starts on Friday.

Gresini added that 50 laps with the bike, whose CBR1000RR engine and electronics are supplied by Ten Kate, had been completed by Valencia Moto2 winner Pirro.

The Italian is said to have lapped in the 1min 51sec range, which is some way off the official WSBK lap record of 1min 47.934sec, but the comparison means little at such an early stage.

The Gresini machine is the ninth and last of the 2012 CRT entries to take to the track.