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400 EXC / XCW ignition faults ?

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Has anyone else had ignition problems ? Bike runs but has a miss under load at 3/4 to full throttle.

Changed coil, lead, cap, pulser coil, plug, from a mates 450. tried every jet combo, from richer to leaner. Im sure it is the ignition but cant use the 450 one to try as its adifferent part number. KTM arnt terribly interested (all to hard)

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