To me a big concern is how to handle the guarantee and warranty? situation.? Here is the prospect of spending lots of money for motor and labor and then finding out the motor does not run well or is worn out or smokes heavily or leaks oil or overheats etc.? ?I think the best source of a motor ( maybe dreaming here)? would be a wrecked Toy RV that had a good running motor in it.? ?Plucking a used motor from a salvage yard has to have its risks because how can you know what kind of condition it is in?? ?What about the companies that claim to sell rebuilt or remanufactured motors ?? ?Maybe with warranties .... I dont know.? ? This is I think similar to the situation with transmissions .....? but probably
a lot bigger.? ?I am a little surprised that your motor is a 22R? the carburated model instead of the Fuel Injection model being a 1987.? ? My RV is a 1985 model with the RE version of the engine.