Colin Edwards believes the new engine rules killed his chances of a strong result in Sunday's Czech Republic Grand Prix at Brno.
The Texan came into the race having been ranked in the top five all weekend - fuelling hopes of a podium challenge.
However, those lap times were set whist riding alone and Edwards got a shock in the race when he realised the kind of top speed deficit he was facing. Struggling to overtake, Edwards was seventh at the end of lap one, and still in seventh at the finish.
With a maximum of five engine changes allowed in the last seven races of this year, Edwards indicated that his M1 has been detuned to improve reliability.
Something certainly seems to have happened, since the M1s of Edwards and team-mate Toseland were ranked just 15th and 17th in terms of top speed over the weekend.
“That was a pretty tough race. Right from the start of the weekend I said I thought my engine felt a bit flat and today I couldn't do anything,” he said. “I was getting passed easily and I couldn't stay in the slipstream at all. I could do the lap time but I couldn't race them.
“I couldn't get within ten bike lengths at the end of the straight but then I'd nearly be running into the back of them at the exit of the corner because I was trying to make up all the time on the brakes and on corner speed.
“I lost the group with Toni, Andrea and Loris for a bit early on but I only came back at them for a while because I was pushing the front so hard. I got the right side of the front tyre way too hot and after that I kept losing the front.
“I was nearly running into them in the middle of the corner but I couldn't get close enough to pass them on the brakes going in. At the end I was locked in a battle with Nicky [for sixth] but I think I could have been behind him all day and not be able to pass him.
“I got another load of points and I was close to the top six, but I've been beating those guys in front of me consistently all year and that's a pity because maybe I could have got another podium today,” he admitted. “I'm back home again for Indianapolis next time out and I'll be looking for a much better weekend."