I have a 1977 Johnson 70hp engine. I ran it a couple of twice this month, but it has been sitting up for a while. I removed the spark plugs and found all three black and oily. After reading the post and following the suggestions, I bought the kits and pulled the carbs. I replaced the floats and gaskets in all three carbs. On the top was a brass screw with a jet behind it which was also on all three carbs. I stripped the brass nut trying to remove it for cleaning and had to tap it out. Neither Posts or internet searches showed this part on the carb of my engine. I pulled one carb and took it to the local J/E Dealer and learned that it was a 1981 carb on my 1977 engine. I also striped the lower orifice behind the drain plug trying to remove it. I ordered a new one from the dealer. My problem is that prior to removing the carbs, I took it out, it ran pretty good but I felt that it had more power than I was getting, plus gas was leaking around one of the caps on carb #2. The dealer said these type of carbs are not adjustable. If this is true, how is the adjustment made to prevent the carb from running too rich?<br /><br />Thanks
