This is a quick video of what I'm thinking of doing to add a primer bulb to the victa lawnmower that I've done a Mikuni carb swap on.
Since doing the swap, the mower was really hard to start (to be fair, it was hard to start before, but that might have been the plastic carb that was on it was trashed, or there might be other things to addresss)
I'm hoping this will make it a bit easier to start. Otherwise I'll have to investigate further.
If you are interested in these primer bulbs, you can find them on aliexpress fairly cheaply. Here is a (affiliate) link to one such bulb.
https://s.click.aliexpress.com/e/_DEz...