Hi, Recently I brought Second Hand Yamaha SZ-RR Version 2.0. While acc

Hi, Recently I brought Second Hand Yamaha SZ-RR Version 2.0. While accelerating above 70kmph the bike loses its power and jerks like there is no fuel (but doesn't stops). There is no problem below 70kmph and the bile runs smoothly below this. I visited multiple service centre near my area and checked below-

1. Spark Plug Changed
2. Chain has no problem
3. RR Unit Changed
4. CDI Checked
5. Carborator Cleaned and checked
6. Throttle cable changed
7. Mobil Changed
8. Complete servicing done
9. Air Filter Changed

But still there is no improvement. It would be High appreciable if you can help in the mentioned issue.

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