Intake and exhaust valves have the same clearance: 0.10 mm (0.0004 in).
10 w 40 is what honda recomends
Yes it does.
I clocked my 1987 250x at 62mph using a friend's car following.
Adjusting the valves isn't hard but it does take some knowledge of the subject. Check out my bio page for help.
not fast enough
60
around 60mph
1.5 quarts
Use nothing but SAE 10w30 Synthetic oil and change it once a year or every 5,000 miles whichever comes first.
Depends how much money you want to invest into it.
its on the very front of the quad under the brush guard on the bumper
The fourtrax will top out at about 55MPH. Actually a stock fourtrax 250x runs at a top speed of 62, but with slight mods can increase the speeds to well over 75.