Welcome to E2S. It sounds like your rings might have worn out a little. 130psi is low on the big bore. I had a 145psi and due to a leaky base gasket it ran like shit. I run the same premix oil at 40:1. Post a pic of the plug.
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My bikes
Foster Bike
00' Banshee (Shit my buddy don't ride it!)
84' FXE Shovelhead
72' Norton Chopper
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