The spark plug I bought wasn't gapped correctly ! That was itHey Parker! and welcome to the forum. Yes It's been damn cold here in Maine. Single digits here in Bangor for the past 2 weeks. It has warmed up today due to freezing rain. Hoping for a couple days of relief. I put my bikes away in November then forget about them til April or so. I have friends that ride year round but they are far more tolerant / brave than I. It amazes me that any internal combustion engine will start and run at these temps. My guess is the fuel/oil mix may be too rich and the cold doesn't help.
Also be sure your fuel tank is venting properly. Good Luck and hang in there!
I had similar problems. One of mine was the float in the carb. Out of the box the damn thing would fill up with gas and sink. Eventually realized I was flooding. On the NT/Speed carbs there is a little weeping hole on the face inside the air cleaner. This will trickle out for when the bowl over fills. Like you, not familiar with these engines yet. Took me a month of Sundays to diagnose.I need some suggestions on my brand new build. Had it going perfect, but now it won’t stay running. Already replaced spark plug, the carb looks perfect, clutch engages fine.
Are there any tricks to these I don’t know about?