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Tecumseh Engine Problem?

I have a Tecumseh 17.5 hp engine on my riding lawn mower.The engine has started to race up and down while mowing.I have changed the spark plug,fuel filter,fuel and checked the carb.float and it still does it.Can you help?.Thanks
Roger, August 2008
Sounds like you have a governor problem

bg, August 2008
link Click here to see other fixes for Tecumseh.