Does anyone know anything about this???

I moved into a house and they left it there for us. It didnt work, but we did a carby clean, new airfilter, fuel filter, and cleaned the sparkplug. Runs pretty good now, but when i hit the highest revs (top speed exactly 40klms), Then fuel seems to cut out and it stalls and seems to do it now and then when heated up

Can you change the back sproket at all to make top speed faster??? i think its some cheapo china bike.

Alot of fun for alittle bike, photo taken up against 18inch rim so pretty its small lol

Any help would be appreciated!

sounds like the carby isnt getting enough fuel through it. bigger fuel lines or maybe you didnt put the carby back together properly.

clean the jets? or tune the air flow meter

Yeh both what i was thinking, cheers guys!