Oil leaking from rocker assembly

Hello,

(My ATV is a 1986 Honda TRX 350)

There had been some oil on the cylinder head fins which I thought was coming from the valve cover seal which I replaced a while ago but never cleaned up the oil. Today I took some brake clean and compressed air to clean it up which worked really well but when I drove it home I noted that some oil was leaking out around bolts going into the rocker assembly. I think it may be the O-rings but not sure. If it is the O-ring what would be the easiest way to fix it without pulling the motor or is it even possible? And would it cause any damage if I leave the slow leak alone and top up the oil ever once and a while?


I think the O-Ring (18) that fits around the rocker arm (7 & 6) isn’t sealing causing the oil to leak out the side of the rocker arm bolt.


Link to partzilla schematic:

https://www.partzilla.com/catalog/honda/atv/1986/trx350-a-fourtrax-4x4/camshaft

Any ideas would be a help
Thanks!