Motorcycle Repair: honda xr 80 head tension, camshaft lobes, honda xr 80

Question
could you tell me the head tension on a 1983 xr80,4large studs, one small also the valve clearances

Answer
David, measure the bolt size (not head size) and use the chart shown here:

http://dodgeram.org/tech/specs/bolts/M_bolts.html

small 6mm bolts/studs need about 5 ft lbs.
larger 8mm nuts should get about 14 ft lbs.

Valve clearances are .002" COLD on both intake and exhaust valves. Set them when the piston is at the T mark on flywheel and when the camshaft lobes are DOWN, so valves are closed. If you set the valve clearances when the cam is on "overlap" (both valves slightly open), then when you turn it one more turn to check the valve clearances will be VERY LOOSE.

I hope you know to install the camshaft/sprocket properly when the piston is at the top!

Bill Silver