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Power loss under load
How long has this been happening? And is it the same all the time? It certainly sounds like you are running out of gas. Those carbs will plug up and almost loose a cylinder, but you are up on top and pulling air thru the throat and gas thru the main jet and that's it. Sooooo, I remember something about the fuel pump cavitating and squeeling, I wonder if you are sucking air in the pick up line from the tank. Or the needle and seat has something in it. I can't remember what makes the fuel pump squeel. Pinched line or??? It just sounds like you are cleaning out the gas that's in the carb and then it dies. Pull the pick up out of the tank and take it off the tank side of the fuel pump and put the air to it. Also there is a test for the fuel pump, so many ounces of fuel in so many seconds. I think you could take the line off, turn the key and guess if it's enough fuel. After all that there is electrical. The ign. module takes care of the advance, and if it doesn't advance you're going to put too much gas in the motor and it will quit. Lots of things to think about.
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Power loss under load
If you can get help with the choke that means that you are slowing down the air intake to create a better mix with the fuel you are getting. That goes to a plugged jet, etc. Could be misleading in this case. There is so much going on in the module that I'm sure there isn't a test for it. It's a shame you don't have a buddie with an HPX that you could borrow a module from. It doesn't have to be mounted, just plugged in. Why don't you try it and right when it stops, shut it off and check the plugs and see if they are wet or dry. If dry you are starving it if wet you are flooding it. Also if they are both the same then it would rule out coil, trigger, etc. that are unique to one side. Also maybe get a hose and a jug ( clean ) and put some gas in it and use it for a supply to the pump to eliminate anything in the tank.
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04-03-2010, 18:32 
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