Need to ask the repairman to help, help yourself to complete. First of all, it is necessary to remove the components connecting to the outside of the engine, select the triangle point, support the tripod, and remove the nut on the fixing screw that fixes the engine in place.
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Hand pull the pulley movement on the trike, so that the engine gradually move up, when the engine frame gasket can be moved, stop the pulley operation, take out the old gasket, replace the new gasket, and finally reset and install the engine fixing nut.