Mystery 500cc Cam

For clarification and part sourcing purposes, the 88ss cylinder head is the same as the 650 and share the same part number (S650/136). Casting numbers are not necessarily the key, it’s the the bolt pattern spacing (assumed same narrow pattern between barrel and head).

johnm said:

But it's strange it is with generator cases. Those heads are 1962/63 onward

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I agree. At this point, I'm sure that this engine was a part of someone's custom dream build that never happened.

Update

After playing around with it a little more, I noticed that the auto advance on the mag had been welded to the fully advanced position. What is the point of locking the timing? Some racing thing?