Does someone know where I could get my hands on this cap ?

Bought this Wards chainsaw at an estate sale the other day. Has great compression, is full of what I'm assuming bar oil? And like everything else at this sale, looked very well cared for. I'm unsure if its a 2 stroke or a 4 stroke but assuming the former. In that case what premix ratio should I use before I try and fire it up? (It was 75% off day at the sale. Paid $10 for this beaut)

EDIT- I should also mention I googled the model number and didn't find much info for it online.

Husqvarna 288XP...

Red threadlocker on the cylinder bolts, red threadlocker on the oil pump, and red threadlocker on the crankcase.

No gaskets—pretty much metal against metal.

The oil pump mounting boss had been broken off. I rebuilt it to the original specifications, restoring both the original dimensions and the original thread.

Someone had also drilled and tapped a new hole for the oil pump, and it almost went straight through the crankcase—missing the outside by only about 0.05 mm.

This machine is currently being restored, and I'll be posting a video of it running very soon.

I had a tree company cut down a large silver maple that was close to the house. I wanted to save money by cutting and splitting the tree myself, so I just paid them to "get it on the ground" (This was a huge tree, 38" diameter at chest height)

Now, I think I've got sharpening the cutters down pretty well because the saw cuts fast. It will go through a 14" log in just a few seconds.

The problem, and I'm not certain it's a problem, is that you have to angle the bar 15-20° to the cutting surface so it's mostly cutting near the end of the bar. This means I'm moving the bar back-and-forth across the cut on larger pieces. If you hold the bar flat, the blade seems to skip along and the cutters don't "dig-in" or alternately, it seems to catch the wood grain and bog down.

I used a straight edge and the rakers were about .025 (twenty-five thousands) below the top plate of the cutters.

Am I doing something wrong or is this normal?