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400ex Won't Start, Loud Clank

763 views 0 replies 1 participant last post by  Buster Jones 
#1 ·
Hi, I have a 2001 Honda 400ex with a 416 big bore, jetted carb, and exhaust slip on. I just got done rebuilding it and have not been able to get it to start. It will only start for a couple seconds. Every time I let off the starter button it makes a loud clank and stops running. The sound only happens when it starts running. If the engine doesn't start, it does not make the noise. I am curious if anyone knows what this sound could be. The noise is coming from the flywheel side of the engine. The only idea I have is that it could have something to do with the flywheel. I replaced the one way bearing on the flywheel and noticed that the surface it runs on looks very worn. I don't know if this would have anything to do with it.

Here is a clip of the sound:
400ex Clank Noise

Thanks
 
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