This is an easy swap but as CKAU has said there are different spline counts,and as it will make top end faster it will suffer on the bottom end and most buggy owners don't want to sacrifice bottom end. This would best work with modded engines. The main problem is that you have to find a sprocket off a buggy that had 14 tooth and no reverse since the buggies with reverse do not use splines for they bolt to the rev box. Every GY6 I have ever worked on be it with or with out reverse uses a 14-16 tooth small sprocket' would immagine a scooter to use the smaller sprocket. You are the first one I heard of with a 13 tooth on a buggy. Monday I will make a few calls to see if I can locate one for you. TOM
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