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The 4 would be pushing it's limit at a 2000 lb load. Depending on your expectations that might be enough. Personally I am a believer in more hp for the same weight and as you are at the max limit for what a 4 can do ( 1 hp for 500 lb )....The 6 is almost certainly the better choice. Carburetors are available from any dealer that you get the engine through. It actually costs less to get the 4 and buy the 6 carb than to buy the 6. However, the 4 has an integral tank where as the 5 and 6 have a seperate fuel tank and line. I don't think you would be wrong to go either way if you choose to go Tohatsu/Nissan/Mercury.
Solution One Maritime
Last edited by TohatsuGuru; 07-29-2008 at 04:43 PM.
Reason: Sometimes even I make a mistake.