The yerfs were bad on breaking the rear mount. Other buggymakers using the gy6 engine used a case support which was 2 piece and bolted around the rear banjo portion of the case. Your lucky since I have seen many yerfs break the rear casing as well. You also must make sure you are using the long bolt with spacer sleeve on the front mounts for this will keep the engine from twisting due to the torque, and make sure the press in mounts are good for they do go bad.
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