125cc World Championship leader Nico Terol saw his points advantage cut from 32 to just 12 points after being forced out of the lead in Sunday's Czech Republic Grand Prix at Brno.
The distraught Spaniard was forced to part his Aspar Aprilia at the side of the track and watch Sandro Cortese and Johann Zarco fight for victory.
The only consolation for Terol was that nearest title rival Zarco was just beaten by Cortese, saving five points.
"It is a strange feeling, because things like this are hard to take - even though they are part of racing," said Terol, who has won five races this year, but missed one round through injury.
"I knew that Zarco had the pace to follow me, so my idea was to pull the pin out and see if I could get away.
"At the start of the ninth lap, I got to the end of the straight and the bike seized up. I tried to pull on the clutch but the bike wouldn't start again. We don't know what happened with it.
"All things considered, the best result for us was that Cortese won and allowed me five points extra advantage over Zarco."
Terol insists he will now use the tightening title chase as motivation for the remaining seven rounds, and will be on the attack at Indianapolis later this month.
"That things are tightening up is extra motivation for me, as there are still plenty of points in play and the gap has reduced," he said.
"Now is the time to attack in every race, so we will analyse what has happened today and get ready for Indianapolis."