I recently purchased a used blaster and not sure what year it is . The no. on the frame is JY43JMAO3TA206801 if that helps . Thanks
Leave the oil injection, unless you wish to use an oil that will not inject, or need to change the oil/fuel ratio.
The oil injection is faultless if cared for properly.
Rule of thumb is to leak test any used 2 stroke that comes into your possession?
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Google Blaster leak down test.