Oil drip at exhaust ports

[moondoggers]

Just got my 66 scrambler back with a freshly rebuilt motor, I put 42 miles on it since getting it back and this morning after a brief warm-up about 3 minutes, oil drops are forming under both exhaust ports with the right side has the most oil forming drops.
I am taking the bike back to the mechanic but I would like to know before I do what could be the cause.
The motor idles nicely and there is no smoke coming from the exhaust pipes though I didn't run it long enough to get it up to operating temperature.

[LOUD MOUSE]

Oil runs down hill.
Have you checked top cap nuts for being tight?. .......lm

Just got my 66 scrambler back with a freshly rebuilt motor, I put 42 miles on it since getting it back and this morning after a brief warm-up about 3 minutes, oil drops are forming under both exhaust ports with the right side has the most oil forming drops.
I am taking the bike back to the mechanic but I would like to know before I do what could be the cause.
The motor idles nicely and there is no smoke coming from the exhaust pipes though I didn't run it long enough to get it up to operating temperature.

[moondoggers]

All tight.

[LOUD MOUSE]

Tappet covers have "O" rings and are firm tight?. .....lm

All tight.

[moondoggers]

All tight.
Perhaps the cap nuts were not torqued correctly.

[LOUD MOUSE]

What value did you check them at?. ........lm

All tight.
Perhaps the cap nuts were not torqued correctly.

[moondoggers]

Gave them a tug with a 14 mm box-end.
Don't own a torque wrench, I'll leave it to the mechanic that's 500 miles west of me to make it right!
Besides the oil drip the kick start lever broke Saturday morning, kinda ruined my day, this is a fresh rebuilt motor.
I expect it to last longer than 42 miles and 10 prods on the starter.