Idle jet is the one just below where it bolts the the manifold and the main jet is the one that should sit a lot lower. I do not know the D-15 well but I know it is close to what a D17 is so very close. As for the tube you can also use a 2 step system where you use a smaller hose most of the way and at the carb a bigger hose that fits over the smaller one. If you have to have it choked to run you have a main jet that is clogged up or a fuel flow problem. Pull the carb drain plug out of the bottom of the carb and let the gas flow for a couple minutes. Catch the gas to make sure it does not have a lot of dirt/water etc in it. If you do not have a good steady flow of gas for a few minutes work you way back to see where the flow stops or slows down
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