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Many people on this site refer to their outboard as being a stock motor. Example OMC Formula E , Yamaha 70CES , Yamato 80 etc. in a stock motor race class each motor has a Document with all of the spec measurements of that motor. To be a legal motor, motors must pass inspection. This is the inspection process for a STOCK class motor. Most inspectors are very familiar with the motors they inspect. They usually have special tools and templates to help in the inspection. The decree to which the motor is inspected depends on the event. National title and World title events will have complete engine tear downs and multiple inspectors to verify the legality of every part of the motor. The inspectors check the simplest parts first. Most times the inspection process stops with the first failed specification. The motor is disqualified. In this video the inspectors are doing the disassembly. At a race a member of the race team does the disassembly. MOD classes have less inspection because those motors can be modified and don’t have as many parts that must be to an exact measurement.
https://www.youtube.com/watch?v=YXhcu1p4SlU

Many Stock & Mod Outboard Classes in CBF and APBA have similar motor specifications. This allows racers from CBF and APBA to compete in JOINT races. These can be club races or NATIONAL championships in the case of APBA. It provides racers with more races in the season and to race at the highest level of competition if they so desire.
Many TORC racers do race at the higher levels and been very successful. At the club level events the inspections are generally more self governed by individuals in the club . At the National or Record events more inspection support and event support is provided by CBF or APBA depending on the event’s sanctioning body.
T Class has its own rule book and the racers competing in the class have more direct input into rule changes and the type of motor inspections.
Club level racing is much more dependent on the individuals racing following the motor specification rules on their own compared to the higher levels of racing where the governing body in-forces the rules .