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Shoot it down the vent tube.. if I remember right, there is a tube that is cut at an angle, like the end of a giant needle, I think it goes down to the float bowl where the fuel sits before it is consumed.. You can spray it down into the barrels too while running. It may or may not improve anything. If you have debris or varnish plugging any small circuits/tubes then it won't do much.. While you are at it, pump the throttle and see if you get any squirts of fuel down the barrel. Just grab the throttle linkage and twist. Do this while it's not running as it is easier to see. With as many miles as your rig has I'm thinking a carb rebuild is due. The secondary barrel has a vacuum actuated butterfly valve AFAIK that tends to not function due to a cracked diaphragm but I don't think that would cause any hesitation, just a slow throttle response..
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