AEROX YQ50 - Will not Rev!

[edge online]

Help!
Recently fitted a new barrel and piston to my son's Aerox 50 (2004)

Bike starts and runs fine, but when revvved beyond 50% throttle, it dies back to tickover.

Pretty sure it is gonna be something silly... have even put the original barrel and piston back on, makes no difference!

So far, in addition to the above...have tried

Changing the fuel
Checking Fuel Tap
Different Carb
New Plug
Inspected Reed Valve - perfect condition

Running out of ideas, any thoughts welcomed - thanks

[hmmmnz]

it does sound like something simple
like the timing isnt advancing??
heres a manual, down load all 3 parts then unzip them
https://scooter-manuals.spb.ru/Manuals/Yamaha%20Aerox%2050%20(96-06)-Service%20Manual.part1.rar
https://scooter-manuals.spb.ru/Manuals/Yamaha%20Aerox%2050%20(96-06)-Service%20Manual.part2.rar
https://scooter-manuals.spb.ru/Manuals/Yamaha%20Aerox%2050%20(96-06)-Service%20Manual.part3.rar
and heres a older manual
https://scooter-manuals.spb.ru/Manuals/Yamaha_YQ50_Aerox_97_Service_Manual_ENG.rar
____________________
the humans are dead
I kick arse for the lord
Wiring Diagrams BIDNIP it bitches

[edge online]

thanks for the manual, can't find much new to look at though, then again, because I dont know wot the problem is.... I dont know what to look up!!!

[hmmmnz]

probably just as well as i think its in russian oops
im not really to familar with scooters, but it must be something simple.
is the exhaust on correctly and not blowing, as this effects smokeys more than 4 strokes.
umm is all the connectors connected, does it have a "power valve system" is it working?
im just stabbing in the dark here
____________________
the humans are dead
I kick arse for the lord
Wiring Diagrams BIDNIP it bitches

[Resurrection]

Stab in the dark for me too but Coil, HT cap/lead?

Checked the plug?

Res
____________________
ZX9r

[edge online]

Guys, just managed to crack this problem ans wanted to say a huge thank you to those who tried and in fact did help me along the way.

I knew it was goibng to be something silly.... and it was!

All of the testing I had done was withouit putting the bike fully back together i.e without putting the air box back on. Turns out all it was that without the air filter it was sucking to much air and simply choking the engine!