Hi I just got this 1982 Yahama. looks like a yamahopper but its blue moped for my kid, he drove it today for about 7 kms and then it started to bog down. I noted the plug was quite covered in black carbon. Im trying to set the mikuni carberator however with no manual its difficult. I have a new plug ready to install. I cleaned the carb yesterday when I got it and had it running around 30-35 kph smooth. Is there anywhere I can go online to find a manual or infor regarding this machine.