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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
TecumsehTecumseh 17.5Garden Tools, Lawn MowersEngine Spark Plug Problem
Sounds like you have a governor problem

bg
August 2008

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Tecumseh 17.5 HP Engine Racing - Help!