Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_39 ( stroke VARCHAR, max_power VARCHAR )

### Question ###
What stroke has a max power of 109 ps(80kw)@4000 rpm?

### Accurate SQL ###

SELECT stroke FROM table_name_39 WHERE max_power = "109 ps(80kw)@4000 rpm"