I need you to clarify a couple of things:
Lower gears?
What kind of rubber is burning? Tires? Belt? something else?
The pillow springs should always be a higher tension than the arm springs. The 12kg arm ones might be OK for you, but you might consider going to a higher tension pillow spring.
The 10g sliders will make your RPMs a bit higher sooner than the 13g will, but you're not really in danger of harming the motor. If your CDI has a rev limiter, you might be hitting that - but that's another issue. My engine runs up at 8600-8800rpms no problem.
You might try running the 13g sliders only, and then the 10g sliders only, just to see the difference (making sure they're set in the variator correctly each time... I'm always messing one up that I usually notice at the last minute!), then play with mixing the weights.
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- Mike
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