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My motor runs great idles decent but when you run full throttle a while it dies but will start right back new fuel new filters new primer bulb mercury 115 outboard 1997
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Fuel issue... first replace primer bulb. Next adjust your high and low needles on the carburetor. 1/4 turn increments. If they have the plastic red and white covers on the needles, simply yank em off (they're epa adjustment limiters). Turn both to the right til comfortably tight, then back out 1 complete turn. Now start your unit, let idle and adjust the L needle until it idles right around where it should be, use your ears. ...after that, you adjust the Holy needle, the high. You do that by depressing the throttle completely and hold it, then turn the Holy needle either right or left until you hit that sweet spot in which the unit runs at full throttle and doesn't bog.
Fuel line could be sucking air.check breather not blocked on fuel tank.if fuel bulb sucks flat,means blockage btwn bulb and tank.have you tried priming motor while running at full throttle.could also be dirty carb
Make sure the fuel tank is venting properly and the pump bulb is new and working properly! Other than than you have an ignition advance module that is not working as it should.
Sounds like air is getting into the fuel line. If you have a squeeze bulb primer check to make sure that it stays firm after you run it a bit. I had an air leak on a clamp attaching the primer bulb to the fuel line and the same thing happened to me. When the engine starts to cut out squeeze the primer bulb and see if it starts running better, if it does then you probably do have an air leak in the line and it is losing it's prime. Hope this helps!
1 turn out is approximate setting fo H and L screws...once running adjust H screw so that it is just rich at full throttle (4 stroking then 2 stroking with out changing screw) once thats right adjust L screw at idle till it starts to pick up speed then just back off 1/8 of turn ....then you can adjust tapered screw to nice idle....if this fails you have carby problem
I have the same problem and may have a solution. I looked at the primer pump and it was cracked letting air into the system. When I pumped it my finger was over the crack and it worked fine. When I stopped the crack was able to **** air again. Take a look.
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