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my ryobi 725r trimmer won't start in spite of replacing the spark plug & ai?

my ryobi 725r trimmer won't start, depsite replacing the spark plug and cleaning the air filter. what else can i do?
ted, September 2008
it's most likely a fuel issue. pull the starter handle a few times and then remove the spark plug. if it's dry, you're not getting fuel to the cylinder and should proceed with a carb cleaning. if it's wet, check for spark.

Jake, October 2008
sounds like you need to have a presser check done on the cycliner block. Could be a blown head gasket or seals. I owe my own OPE bussiness.

daniel mardis, September 2008
link Click here to see other fixes for Ryobi.