A 3 gallon gas tank should be plenty for your 6 HP Evinrude with gas to spare.
CRA Jr
The propeller size on an outboard engine, is dependant on the application. The size of the boat, and more particularly the weight it will carry, determines the propeller size.
As of January 2011 Evinrude does not. In 2010 they came out with a 15 hp E-Tec outboard motor. This is basically there 25hp model regulated to do no more than 15hp. If you look at these motors side by side, there the same size and weight. The weight of the 25 hp E-Tec 20" shaft is between 150 lbs and 183 lbs, depending on the model. The problem is that the 15 hp models weight the same and this too heavy for some boats transoms. In my opinion it's a joke, Evinrude did it so guys could by a smaller matching "kicker" outboard for trolling, next to there bigger higher outboard motor. Lets hope that in the very near future they will come out with a 9.9 or a 15 hp E-Tec that will have the lower weight. These outboards should only be weighing in the neighborhood of 80- 115 pounds. Hope this helps! Chris
For a 2005, Mercury 3.3 hp outboard, a NGK BPR6HS.
OD281588
not sure how wide your Jon boat is but I would go with a 3.5HP or 5HP outboard no bigger
175/150
550 cca
Any place that sells batteries can tell you the correct size to buy.
A Johnson outboard, model 6R-74C, would be a 1974 year model, 6 hp.
At the official Suzuki outboard website, SuzukiMarine. They sell all sorts of outboard accessories on the site as well as outboards of various size and power.
1-1/2x16
100 aph