If you need to perform fixes on your own IZH Cornet 2673 then it is always recommended to have a Workshop Manual for a guide just in case you want to know techniques to take off a specific component for example Gearbox and install it again accordingly.
IZH Cornet 2673 Workshop Manuals provides targeted diagnostic information with regards to your car therefore if something is faulty it will help you work out what the situation is and methods to resolve it. You can then evaluate if this can be done on your own or if the job is too big you could make a reservation for your Cornet 2673 in with a decent mechanic.
IZH Cornet 2673 manual