How much horspower, psi, and GPM is enough to wash your ATV efficiently??

 

An atv doesn't require a real powerfull pressure washer. You have to be careful when washing the areas around the bearings, carb, snorkel, and chain, if you are running an O ring. You will blow the grease right out of these, and push dirt into the seals. 1500-2000 psi should be sufficient.