Originally Posted by goingtoscotland
There's no certification for motorcycles like there is for cars(ASE).
Yet another 'mechanic' you've picked that doesn't know his asshole from an exhaust port.
You should go fix his bike if your superior enough to judge two mechanics abilities on the posts of a non-mechanical owner.
Your half right there is no universal sanctioning body for motorcycle repair certification, only dealer certs for the various makes. The other half is ASE isn't car certification it's automotive and covers the entire spectrum even if training and testing is done on 4 wheels, a motor is a motor and a wheel a wheel no matter what's it on.
State-certification has nothing to do with ASE though, it just means your licensed to work as a mechanic, have general automotive knowledge, and have certain responsibilities to customers.
As for cranking over and locking then the bike gets rolling, it could perhaps be a error in translation. It could be the motor turns over until it reaches a certain point and then it won't turn anymore but you can turn it backwards again until it reaches a stopping point. Something like what you'd have with a dropped valve or something in the chamber, this something would also cause piston damage.