Re: 4 stroke 40 hp how to get more uot of it
The least expensive method to get more horsepower out of any engine is to buy the size you need. No doubt you've looked at the specs and determined the displacement (CC) is the same as a one or two higher horsepower models. Cam, compression, exhaust tunign carburetion, and ignition advance determines horsepower on four strokes. You would need to go to the Mercury web site and compare parts lists for the higher HP engines to see what parts you need to complete the job. You will also find the costs to be prohibitive.