Adjusting the valves isn't hard but it does take some knowledge of the subject. Check out my bio page for help.
Intake and exhaust valves have the same clearance: 0.10 mm (0.0004 in).
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.
10 w 40 is what honda recomends
If there was no damage to the cylinder bore then you will not need to bore it oversize.If there was no damage to the cylinder bore then you will not need to bore it oversize.
I clocked my 1987 250x at 62mph using a friend's car following.
-248
Yes it does.
Use nothing but SAE 10w30 Synthetic oil and change it once a year or every 5,000 miles whichever comes first.
10w-30
250x + 250 * x.
not fast enough
60