what should be the ration for a suzuki rm 125 2 stroke engine( for gas and oil)?

20:1 but NEVER use 2stroke boat motor oil, this oil is parafin based and will foul your plugs. Go to your local cycle shop and get the right oil, in a pinch I have used chain saw oil and it worked fine.
 
20:1 but NEVER use 2stroke boat motor oil, this oil is parafin based and will foul your plugs. Go to your local cycle shop and get the right oil, in a pinch I have used chain saw oil and it worked fine.
 
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