I think we can bury this issue here and now.
I dont think i can argue about the machines that i havent ridden.
GTO125 seems to makes same power as the Yamaha RXZ @18bhp(india special RX series model) and its light weight but let me tell you one thing even the RXZ didint do that kind of speed.And if it had a analogue needle speedometer there is bound to be some amount of error.You can check it by using SIGMA or some GPS device which will tell you the speed.
If its showing 140kph on the speedo then the true speed is somewhere close to ~125 +-few kph
@abdulsattar_civic95-Bro i myself ride a RD 350 (i maintain it myself)...you can find the pics in some of the topics i post on PW so i know enough of the 2stroke tech for you kind info.
@RX115- Even RD is a japanese model...model from 1983 to 1985 were imported in India and had the "Made in Japan" sign on them.Mine is a '84 model.
Bro who told you only bike speedo had errors....even cars have erroneous speedometers