You dont, it's an automatic hydraulic tensioner. However eventually the chain and/or tensioner spring will wear out.
0.6 qt is what honda recommends
.6 litre
About 65-70 MPH
0.6 quarts
It is a four stroke.
if it is on the carbrator the float could be stuck
55 to 60 its fast
try 10w 40
i have one myself, up is off, down is on
about 5-15 hundred dollars
Any JASO-MA or MA2 approved 15-40 W oil.
The spark plug gap for a 2000 Honda XR70 should be set at .028 inches. A new spark plug can be purchased from an auto parts store already set.