bob58o
SuckSqueezeBangBlow
What is this vehicle anyway?
Here ya go. FYI I'm new to small engines so all the help is greatly appreciatedCan you post a close up of the business end of the spark plug?

I have never heard anyone here suggest intentionally stretching a Valve Spring.
Not that it is not a performance trick. Just never heard of it on these Small Engines.
Try one thing before you give up.
change out that plug for a normal style one.
Multi prong plugs are used in aviation. They don't work in lawn mowers. The spark will go to least resistance, that's usually the same electrode and the others will block the spark from getting in the fuel/air mix.
They work in racing applications where your running a much hotter engine.
Try a "normal" plug and report back.
---------- Post added at 06:18 PM ---------- Previous post was at 06:17 PM ----------
Also, the ignition system was made to run a normal plug too.