Have you checked your speed with a phone app? Certainly worth picking up a $20 tachometer and making sure you are getting full RPMs, 3600 is stock, though the governor can usually be adjusted for another thousand or so using the various spring holes. I’ve seen many engines that are not getting...
It was the low speed cruising that fouled plugs. Engines tuned rich down low for good throttle response fouled when they never had the chance to open up, heat the plugs, and clean them up.
I’ve tried several new/different caps on the Coleman/Hisun tank. They all leak. Let us know if you figure it out.
Common problem, I wouldn’t be surprised if they get sued someday over a fire injury. At least they seem to leak towards the intake side.
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