user: Question: What stroke has a max power of 109 PS(80kW)@4000 rpm?
Columns: ['Code', 'Vehicle', 'Year', 'Displacement', 'Bore', 'Stroke', 'C.R.', 'Max. Power']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['YD22DD', 'Nissan Y11 AD Van', '2000–2002', '2.2L(2184cc)', '86.0mm', '94.0mm', '18:1', '77 PS(55kW)@4000 rpm']
SQL:

assistant: SELECT "Stroke" FROM "Table" WHERE "Max. Power" = '109 PS(80kW)@4000 rpm';