Those carb kit #439074 & #439075 have increased in price recently. They do have different parts for different year motors. Talking with BRP supplier to get a kit to fit all models. Just a few parts differences and only one kit would work. The 40 hp motor of this style was built until 1986 as a commercial model. The style carb changed to a TR type carb around 1979? That is the carb that takes kit #396701 Outboardnut2 mentions. The float #382363 (18-7210) from that kit can be modified slightly to use in your older motors. It is the Nytril material. Again, why OMC/BRP have not done this is baffling?
Hope that helps untangle some of the confusion.
Some of the differences in the two kits are:
6 packing washers (#307583) vs 2. Later carbs had high speed jets and didn’t require the 4 extra packing washers.
2 different gaskets for the air box vs the plastic face plate.
2 different length filter socks for the fuel pump? This is redundant as you get a filter with the fuel pump rebuild kit. Better left out of the kit or purchased separately. JMHO to reduce cost!
I’m sure I am forgetting something, but I presented all of this as a compromise for one kit at a better price with the newer style float. Not sure where we are at this point?
Dan in TN
