Hey Al,
Was there a problem you were trying to fix?
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To anyone thinking about plunking down a $20 bill for them, don't do it unless you need to.
The only reason I changed was because of a detectable slump in the 3500-4500 range RPMs in all gears. The slightly more radical taper of the TBS needles cleared this up for me. However, I am running what you see in my sig in South Florida (a lot different atmosphere than say..., Denver).
Another thing to consider is the type of riding you do. Most of mine is light to light (even with concerted avoidance) with a few longer stretches thrown in. Some weekends, I get out for longer runs.
As everyone's mileage will vary, so will performance. The best bet is understand how you ride and what other people in your area with the same bikes are doing and use that information as a working point. I've tuned Raven to work best for me and down here.
If you can afford it (or can get one free!
), a dyno and a gas/fuel - exhaust analysis will give you the complete technical answer but not the whole answer. My response is the most important.
