shimming would be perfectly fine if you took the time to fine tune the carb with the correct number of shims. I was running around with my area P and washers for months before I decided to rejet. The bike ran well. in fact if you ever watched my uphill vid, that was done with the AP and washers in the carbs.
I only decided to install a jet kit because I removed my airbox and had to rejet completely at that point, anyway.
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