The older buggies with the GY6 had external reverse which was added since scooters where the GY6 originated did not have reverse. In about 2008 the internal reverse GY6 was born. We need to know if you have the internal or external reverse. The external reverse will hang on the output shaft held on with a single nut I believe 7/8" in size. If not sure what you have post a pic of your unit and we sure can put you on the right path.
TOM
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