I agree there are many things that can be done to improve a bikes power/ speed, but if cost is a consideration then you may want to proceed in this order:
1. Replace the spark plug (gapped) $5
2. Race gas ( be careful about overheating with higher octane) $4-10/ gal
3. Change sprockets (smaller size less teeth on back) $20-60
4. Aftermarket pipe $50 - 150
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