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After some sleep, it occurred to me that the AIR device is responsible for the back-firing, more so than the mixture screw. I removed it this morning and removed the muffler for a little flat black heat paint.
After work, I'll fabricate a block-off plate for the AIR device, re-mount the muffler and tune it again.
At the last test run, the torque off the line was acceptable, and the top speed was much improved. However, the mid-range is suffering a bit, and I attribute that to the stock variator. I'm considering new sliders / rollers, although a bigger main jet might solve the issue.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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