ATC70 oil leak

[Hayward]

I just overhauled the top end of my '85 ATC70 and when I cranked it up, oil was pouring out by one of the head bolts. I torqued all the nuts down and have all new gaskets. I can not figure what's up with the oil bypassing the lower left bolt. Any help ?

[Race Demon]

sitting on the bike, the lower right should have a brass washer for a seal on it , I think thats what your talking about

[KASEY]

If Its On The Top ,, Yep The Brass Washer,,, If Its In The Gap Between The Head And Cylinder,,, The Oring In The Head Gasket Is Missing...

[Hayward]

That's the correct bolt leaking. Problem is, I have not noticed any difference in the washers. I'll double check that brass washer. 3 nuts are cap-types and 1 is a regular hex head. I suppose that the one that should have the brass washer?

[Daddio]

That's the correct bolt leaking. Problem is, I have not noticed any difference in the washers. I'll double check that brass washer. 3 nuts are cap-types and 1 is a regular hex head. I suppose that the one that should have the brass washer?
Mine has cap nuts on all four head studs.

[Hayward]

Thanks you All ! While bolting the valve/rocker cover on, I got the bright idea to add lock washers.?> ?. After looking for the brass washer you mentioned, it hit me what the problem was. After removing the lock washers, no leak problem. Thanks again and have a fun and safe ride ...