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I am in the process of installing a 734BBK and was instructed to replace the cam and oil pump chains. When I pulled the magneto off I noticed these heat marks on the starter wheel gear. I am guessing that the heat marks are part of the manufacturing process since nothing else looks to have any marks. I would think that if the magneto got that hot it would have caused damage to other components also. I am just trying to get some insight before putting it all back together.
 

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In order to make those markings, that gear would have been red hot. Probably created by the stress relieving process during manufacturing. That said, it does not look right to me and for piece of mind I would have it magnetic particle tested to check for heat/stress induced cracking. I would also have the rest of the top end parts tested before reassembly.
 
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