Hi, and thanks in advance for any help that any of the pros on here can give me. My brother just purchased a 16' tri-hull with a 1882 3cyl. 70hp Evinrude. When boat is in the driveway and outboard is in a tank, it seems to run pretty good other than a slightly rough idle and sometimes bogging when trying to rev it. I have done the "link and sync" on it and got the timing right at idle and WOT. When we take it to the lake and put it under a load, it won't get up on a plane and won't rev over about 2000 rpm. If I partially choke the top and bottom carbs with my fingers, it takes right off. I had the bowl off the upper carb, to adjust the float because of lack of fuel, but it didn't have any trash in it. I think all carbs may need a good cleaning and rebuild. These carbs have no low or high speed adjustment to them, which has got me scratching my head. Anybody agree that these are in need of a rebuild? Are these carbs comparable to a 4 cycle carb on a car engine? Pretty much disassemble, clean, and reassemble? Is there anything else I should check before tearing into them? Could a vacuum leak be causing this? Compression is between 115 and 130 on all cylenders. Fuel lines are new and gas tank is clean. Thanks again.....Kevin
