Newbie and 2 questions

[aware]

Thanks for the link!
However I am based in EU and aftraid that custom charges will apply so I try to spot any on ebay or ali.
The only close substitute seems to be this:
https://www.aliexpress.com/item/32776140450.html

What do you guys think?

 

[Frogslayer]

Well you already have a .70. I don't think you'll go richer. 55 might be too lean. That leaves you with like 2 jets to choose from the .60 and .65. You might get lucky and one of those may be what you need, probably the .65 unless you live on a mountain. This is why I wanted the single increment sets that Gary55 linked. Just my 2c.

 

[aware]

I ordered some of them on aliexpress and will test them and come back.
This 4-stroke behaviour at mid revs is so ridiculous...