I think that if I were to us a RM80 motor, I would try it on the stock swingarm first. Even though the 80 is going to have a lot more power then the GY6, is it going to have the type of power that you are looking for in a buggy? My other concern would be the clutch. You are going to be asking the little 80 to pull 3 to 4 times the weight then it was designed for. I'd hate to see you put a lot of work into new suspension only to find out that the clutch might not be able stand the abuse. Also, is it a newer water cooled motor or an older air cooled? You may need to duct in some cooling air for the older motor, or run a fan on the radiator for the newer style.
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