I just bought a used 25hp carb for my 20hp merc to upgrade power and a bit of wot. My biggest thing is when buying a used carburetor is it usually worth it? I'm going to completely rebuild it from the bottom up. I'm going to clean and replace everything. My question is ,is there anything I really need to worry about buying a used carb? I bought it from eBay and has a 30 day money back guarantee to. The carb came off another 25hp 2 stroke mercury that was running but lost compression according to the ad. The carb came off a 94 engine and mine is a 93 so that worked out nicely. Good thing is his feedback is 100% so that says something I would guess. He runs like a salvage yard but sells a ton of parts on ebay. I paid $90 for it so I think I got a great deal. I wanted new but merc said they are so far on backorder and are $330. It could be a long time before they come off backorder and I mean no one has one in stock new or used as this one just popped up recently. I'm guessing if I rebuild everything from top to bottom it should be ok. Good thing is my 20hp carburetor is identical except the bore which is the only difference. I can take everything from my 20hp carb if needed and use it on the new one I'm getting if needed. Any info on anything I should look for when I get it would be great. I would think carbs are pretty tough and not much goes wrong with them besides the rebuilding parts I'm installing.