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1972 250c Engine noise

3955 Views 13 Replies 6 Participants Last post by  agillot
Just purchased a 1972 250c, overall good shape, however engine makes a knocking sound. The previous owner said that a head job was done (doubt it), but could it be possible that the job was done incorrectly? Also, what could be the most probable cause for an engine to knock?

If so, is this particular engine hard to rebuilt?

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If the knock stops when you pull the plug wire it is your rod bearing that's shot. You have to pull the engine for major surgery. I too am in the same process. If it were the head you would not be getting a good valve seal or would hit the piston causing obvious damage and noises (if it would run at all).

Rebuilt engines are available but they are pricey ($9k -$11k). Check the internet for info
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