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What causes a Honda 400ex missing at high rpms?

* Fuel system:

* Clogged fuel injector or carburetor

* Low fuel pressure

* Faulty fuel pump

* Ignition system:

* Faulty spark plug

* Bad spark plug wire

* Weak ignition coil

* Valve train:

* Bent or broken valve

* Leaky valve seal

* Cam timing:

* Advanced or retarded cam timing

* Compression:

* Low compression due to worn piston rings or valves