Yamaha aerox 100 power problems

I've got a 2002 Yamaha aerox 100 and I can't find what the problem is with my power I can literally hold the bike back at full throttle, very tried the fuel to air mixture screw and cleaning the exhaust. any ideas anyone?

 

Yamaha aerox 100 problems.

the bike starts and runs fine there's just no power to it. I took off the head and there's a slight wobble in the piston could that cause it to lack power that much? thanks

 

ok bud thanks. I'm pretty sure the reed valves are ok I think I made the mistake of buying a budget piston and head so I bought a malossi head and piston hopefully that sorts it. thanks for your help

 

possibly transmission is worn out, tried checking your belt/rollers/clutch?

 

yeah the belt is good and new rollers it's strange it starts and ticks over fine just when I come to give it some throttle it bogs down thanks

 

yeah I think so lol it was a naraku one lasted about a week

 

yeah I bought a malossi head and piston I'm gonna check read valves as well as you suggested should I buy racing ones?

 

yeah I was thinking about getting a 4 stroke so much more reliable I've put a fair bit of money into this bike so I need to finish it now though lol I'll check the reeds tomorow and if there gone I'll get malossi or something thanks for your help bud

 

yeah I might just do that mate gonna finish off this project I think first though lol