Bruce:
When i try to change the blazes the lawn mower was completely cold.
Sorry i am just making sure i am doing it right.
1. Add unleaded fuel to the lawn mower....is that what you mean when you said "Then put some fuel into the cylinder to wash out it out"???
2. Remove the Spark Plug
3. Starter Rope MUST be in "stop" position
4. Pull it for at least 6 times
5. Replace Spark Plug
6. Run the it again till there is no more smoke???
Is the above points look right to you???
Cheers

Derrick