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juddering at full throttal?

I have yamaha 30hp T/S autolube..powering a 14 dory but at pull throttal she is pulling back and i have just come back a bit of the throttal to stop the juddering...There is a nine and a half inch prop on it..Any ideals any one..CHRIS
Chris, March 2009
link Click here to see other fixes for Yamaha 30HP T/S.