I recently took my Honda 4 stroke 90 hp outboard to have the carbs rebuilt. After about two weeks I was called and told to come pick up my boat. I was given a fairly large bill. So about a week later I took my boat out on the water, from the moment the boat hit the water it ran like crap. Side note I used a new gas tank and new gas. I returned my boat and motor to the marine that repaired the motor a week and a half prior. The first thing was for them to try to charge an extra $300 for some kind of carb fuel system flush. Ilost my temper over the whole deal. They then told me they would make good on their work. They called me down to their shop yesterday to show me that my intakes were covered in something no one could figure out what it was. The inside of carbs, the jets , the bowls, was all shiny and new looking, but they (mechanics) told me this build up in intakes could only be my fault. My question is it possible to have about a 1/16 of an inch build up of stuff on the intake side of the carbs, but the inside of the carbs including the jets looked brand new. Oh! Side note. Iran the motor for 20 minutes on new gas in a new tank. So If any could help out with your thoughts would be very helpful. I FEEL XYZ Marine IS TRY TO SCREW ME!!!!!