Linhai engine vs. the Hisun engine, don't see why that makes much difference as far as customer support. I personally have not had a problem with the actual engine itself, it's how these parts interface with each other (quality control). If you don't properly torque bolts, install seals wrong, don't install fuel filters, have poor wiring connectors, don't adjust shift linkage right, use junk lubricates, leave air in the cooling system, don't have a good clear maintenance manual, etc, etc, you are going to have issues and you better have a good customer support group.