I know this thread has a little age on it but hopefully some of you are still reading the mail. I am curious as the to tone of my YM2210. I know a lot of guys have asked about the serious knock of the 2T90 (the Yanmar Hammer) but I am a little concerned with reference to the slight skip when I rev the engine. It's not a serious miss but if it were a Chevy, I would say it's skipping. Does any of you experience the same thing? I also noticed that the tach needle jumps with the sound of the miss. There is no white smoke which usually accompanies a misfire, but being a newbie to the 2 cylinder diesel I thought I would ask some of you experienced guys. Oh, by the way, I have bleed the fuel system in an effort to purge the air but it still runs the same. Any comments will be deeply appreciated.