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Does it idle correctly ??? You have an idle mixture screw that might need to be tweaked a little or you have an idle jet that is dirty. When you turn the throttle past that point you are pulling fuel through the main jet and bypassing the issue. Try to partially apply the choke and see if it runs better at your problem spot, this will help diagnose the issue...
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Your best bet , take an have a fuel pressue an flow test done . If you think it's fuel related . I'm sure you probably don't have the tool's to do these tests. We test , not guess as to what could be the problem . If clogged fuel filter it wouldn't get any fuel an it wouldn't start an run at all .
P0300 is misfire and p1406 is EGR. It sounds like you have a chunk of carbon stuck in the EGR valve. Remove the valve and clean the carbon from the valve, bottom side. Then install a screened gasket so it won't happen again.
If you have installed the Dynojet kit's carburetor needles take them off and use the stock ones. Dynojet's needles are for track use only and the don't work properly under 4000rpm.
Do you have the H and L adjuster screws on the carb? If so, then normally I'd back out a little bit on the L (low speed side of carb) The instructions for adjusting carbs, years ago, on 2-stroke, say to back out on the L when motor will not rapidly rev up. Most 2-stroke carbs have these 2-jets. The L is for gas to pass to motor with butterfly throttle plate closed. When opening throttle plate, there is a sudden rush of air, at first, and this L adjustment is allowing enough gas to pass for motor to begin to rev. up. Then the gas will also flow through another small port H, usually a small brass tube in the venture area (smallest diameter section of carb). You adjust the H with the throttle wide open, motor revved up. Turn either in or out slightly till highest RPMS reached, motor smooth and fast, then turn H out about 1/4 turn. The idea is to run motor slightly rich for highest HP when under load (cutting). Hope this helps
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