If you need to accomplish adjustments to your Honda CR 250 F then it will always be a great idea to have access to a Workshop Manual to use as reference just in case you want to know the right way to take out a particular component including Gearbox and match it again correctly.
Honda CR 250 F Workshop Manuals offers clear precise diagnostic info with regards to your car so if something is faulty it can help you identify what the problem is and how to make it better. After that you can determine if this can be done yourself or in the event the job is simply too big you can still make a reservation for your CR 250 F in with a local friendly mechanic.
Honda CR 250 F manual