Quote:
Originally Posted by
dalek
Other possibility mentioned was decompression mechanism. Removed cam cover and the mechanism counter weights seemed to have a lot of play when moved by hand. Is this normal, and could it cause a constant rattle?
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Rattles like this are often caused by a loose, broken or incorrectly fitted decompression pin. It's less likely to be the centrifugal weight mechanism on the end of the cam/sprocket. The cam is hollow and the pin is pushed through a hole in the side of the shaft to lift an exhaust valve when cranking. If this pin is loose, not engaged correctly with the mechanism, or fitted the wrong way round it will rattle all the time.
Can you make a video to demonstrate what the rattle sounds like?