No, a Class C driver's license in the USA does not authorize you to drive a motorcycle in the Philippines. The Class C license typically permits the operation of non-commercial motor vehicles, such as passenger cars and light trucks, but it does not include motorcycles or motorbikes.
In the Philippines, operating a motorcycle requires a specific driver's license endorsement or restriction code. To legally drive a motorcycle in the Philippines, you need to obtain a Philippine driver's license with a restriction code specifically indicating that you are authorized to operate motorcycles.
If you plan to ride a motorcycle in the Philippines, you will need to check the specific requirements and procedures established by the Land Transportation Office (LTO) in the Philippines. They will provide information on the necessary steps to obtain the appropriate driver's license endorsement or restriction code for motorcycles.