Sorry, my post details were pasted in and got the front cut off. Here's the corrected detail.
During testing I discovered an oddity. Pulled air filters out of air box and it ran better, made carb adjustment to highest idle, put the air box back on but without the filter and cover. It ran just like before, bogging down at higher rpm. An empty air filter box with nothing in it was enough restriction to make it run bad. I've worked on cars and motorcycles for 45 years and I would have never believed it if I had not seen it.
What can cause such an issue?
Air box off and it runs perfectly fine and obviously I cannot run it without a filter.
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