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yes, wheelie machine. Might be a bit low for that machine, but it will have a lot of low end grunt. Make sure your back gear is in good shape and your chain. Rule of thumb is to do a new chain and both sprockets at once. New gear wont last long if there worn out too.
Sorry don't actually know, I used the stock ones. $1.50 on Motorsport.com. Their good, every part for the PW80. Heres a link. www.motosport.com/oem-parts/part-number/90101-08672-00?mmy=yamaha%3Bpw80%3B2003&group=rear-wheel&qty=4 Good luck with your project.