Intake and exhaust valves have the same clearance: 0.10 mm (0.0004 in).
10 w 40 is what honda recomends
The valve clearance for a 1987 Honda TRX 250X is typically set at 0.05 mm (0.002 inches) for the intake valves and 0.08 mm (0.003 inches) for the exhaust valves. It's important to check and adjust the valve clearance regularly to ensure optimal engine performance. Make sure the engine is cold before making adjustments, and refer to the service manual for specific procedures and specifications.
Yes it does.
I clocked my 1987 250x at 62mph using a friend's car following.
not fast enough
60
Adjusting the valves isn't hard but it does take some knowledge of the subject. Check out my bio page for help.
1.5 quarts
around 60mph
Use nothing but SAE 10w30 Synthetic oil and change it once a year or every 5,000 miles whichever comes first.
its on the very front of the quad under the brush guard on the bumper
Depends how much money you want to invest into it.