most of the time, the serial number plates are located on the front of the frame on the left hand side usually, im not for sure tho about a 1991 Honda but i know for a fact its there on the later models
Horn location for a 1991 Honda civic HB To access the horn, you have to remove the front bumper. The horn is located on the passenger side of the car covered by the front bumper. You can see it by looking through the "bumper grill" near the passenger side front tire.
The battery on almost all MOTORCYCLES is under the seat, It is on your Honda MOTORCYCLE too, call A Honda dealer, ask for service, they will be happy to tell you how to get to it.,,,,,Good luck, Jamison.
Honda CRX was built from Honda Civic platform and shared many components with the Civic. All Honda CRX models have a mechanical fuel pump that can be easily located within the engine bay, making fuel-pump replacement much easier than on some newer cars.?æ