Hey mates me and my buddy have been arguing abt vuka xl110 and no limit racing DB110c which one is faster between them

That is about right for a 110cc step-through scooter. They are very unaerodynamic. For a small engine it also depends on your weight and how much of a sail (wind resistance) you present to the oncoming air.

https://www.google.com/search?q=vuka+xl110+specs

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Sounds like a dirty carburetor or blocked main jet.

NO. The fuel/air mixture will be way rich.

Hi my vuka xl110 is losing power I bought a new air cooled box bt its still running slow. It mis sumwher bt I don't knw wher and what's the cause why the bike run slow at full throttle plz help tnx

first off drain out the oil and add fresh stuff. If it is a centrificial type clutch you may have to replace the clutch pads.

Sounds like the gas tank isn't venting.

If air isn't allowed to enter the gas tank to replace the gas flowing out, vapor lock happens.

Next time it dies, remove gas cap and see if it starts quicker/easier, and runs longer.

If so, then you have a plugged vent.

Need to see a mechanic.

you can use any 20w50