What is valve settings for 1991 Honda trx250x?

The valve to rocker arm clearance is 0.04 millimeters on both of the exhaust and intake valves (4 total valves). Make sure that the engine is on the compression stroke and that the 'T' mark is lined up to the line in the viewing window in the left side of the engine. You will know that it is the compression stroke if there is some wobble/play in the rocker arms.