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On my 2001 Zuma, I had the biggest gains with swapping out the primary drive with a taller geared one. Then it was the BBK (69cc Stage 6 Race), I did the pipe, rollars, and bbk at the same time (Technigas NextR, Polini super speed Variator). I also swapped out my stock 14mm with a 21mm, and swapped out my stock intake to a Polini big bore intake with CF reeds. I can tell you for sure, the carb only made maybe a 5% differance in power (only at high rpm, 9,000+), and the reeds made zero differance. I had over 60 hours of run time on that motor and it ran perfect when I sold it. It would do 55 on the flat, 50 uphill and 60 downhill.
The moral of the story is; Don't waste your money on reeds or a carb until you've gotten the bbk, the pipe, variator and rollars, clutch springs, torque spring, and primary drive replaced.
Good luck!
(just an fyi, soft siezes are for people who don't know how to jet a motor. Always guess rich, and work your way lean. NOT the other way around.)

Ha! My thoughts exactly... If the rubber looks good, run it!

I had 4000+ miles on my Zuma on it's stock belt. 3000 of those miles were with the red torque spring (and bbk, pipe, carb, exc...). Your belt issue might be as simple as having a very low grade stock belt. The idea that a stiffer torque spring can dramatically increase wear, is a myth. Just get a good belt from a known supplier and see how it goes.

It was even with my chin, now it's even with my nose, and the wind noise against my helmet is greatly reduced (I can hear the motor purring along now, couldn't before). In my case, it was the perfect and easy fix to the noise.

I, just today, took a torch and heated up my windshield in the middle and put a slight bend in it to raise the top of it, in order to allow the rush of wind pressure hitting my helmet, to go over my helmet (or at least hit the top of my helmet, not the whole thing), yet still allow me to see over the top of the windshield. I certainly appreciate a taller windshield on longer rides...

Two strokes need a precision CVT. New rollars are always better than sliders (everyone has an opinion, right?)

Any two stroke oil is good. Synthetic is just a waste of money. 50 engine hours after installing my Stage 6 race kit (Zuma), the motor ran like new still (running Valvoline weed wacker oil).

To answer the author's question, I soft siezed my old Zuma twice. Both times it seemed like it was running really good for 20 minutes+, then it bogged for a mile or two, then didn't quite sieze (piston stuck in cylinder), but definately let me know to stop trying to go and shut it off. If you think you're at risk, get a bigger main jet.