Ulsterman Jeremy McWilliams admitted he pulled out of the Czech Grand Prix after his Proton KR bike became a danger.
McWilliams has suffered serious trouble this season with the team’s new four-stroke machine proving unreliable, forcing Kenny Roberts’ outfit to briefly return to their out-dated two-stroke.
Yesterday’s race at Brno proved to be another disappointment for the veteran, who pulled into the garage after mechanical problems made his bike dangerous.
McWilliams said: “I was using my second-best engine, and I don’t really know what happened.
“It was losing some power, and I wasn’t really racing, just riding around in 22nd position. I was going slower and slower each lap.
“Lack of rear grip was my biggest problem, and I wasn’t sure of the reason. I thought it might be that there was a bit of oil getting to the rear tyre, which is always a worry. In the end, I really didn’t see much point in carrying on.”
Britain’s Chris Burns also endured a miserable race, and has yet to finish a grand prix after a mystery ailment put his Harris WCM Yamaha into retirement.
Burns said: “I am yet to finish a GP and I pulled into the garage after nine laps today after the bike lost power lap after lap.
“We put in new pistons in the morning so the bike would be stronger for the race, but I just got slower and slower each lap.
“The bike was worse then ever, unbelievably slow. All I can say is I hope for better things and I am really looking forward to Portugal.”
Repsol Honda’s Valentino Rossi won the race after a thrilling fight with title rival Sete Gibernau, on a Telefonica Movistar Honda, with Troy Bayliss taking a superb third for Ducati Marlboro.
In the 250cc class Welsh teenager Chaz Davies finished 14th as Randy de Puniet won while Daniel Pedrosa won the 125cc race with 15-year-old Czech girl Marketa Janakova finishing 25th.