6.3mm Blade terminals with latch that's what you need to replace your old ones.
It's better to crimp them on and fit then into the plastic sockets, no need for shrinkwrap unless you are also replacing the bullet type connectors!
The sockets are usually called 2-way, 3-way, 4-way etc and you can find some on ebay UK.
I've just done this to all my wiring, crimping, replacing, soldering and shrinkwraping where needed!
Also, it could be that you have a very rich carburetor mix and that is fouling your sparkplug due to the increased air humidity which makes the air "thinner" in O2 level.
Good luck!
Vando
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