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I am still having issues with my 94 MX 470, I cleaned the carbs at the first of the season and it would bog down/out after running for a short time. After some research I thought that the fuel pump could be the issue so I took the old one out and instead of cleaning I just bought a new one for $31. I put that in tonight and it still is having a problem, it will run for a few seconds to a min or so and then die out.I'm stumped for answers here. It does have gas in the tank, less than 1/4 and that is probably a mix of old and new, I don't think this could be a problem though. Anyone have any more ideas on what could be the problem???
 

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check all your fuel lines for cracks, as well as the lines from the primer, also check the rubber boots on the carbs that go to the engine and make sure they have no cracks. I also have a 470 and when i start it when she starts to bog i hit the primer a couple a times untill it starts to suck fuel on its own seems to work for me.
 
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