Any guesses what is stuck in my crank?

[Marlin72xs]

Just pulled the 256 crank and the lead plugs are actually loose. I could move them with my fingernail. I am wowed.

 

[yamahama]

Now I know "The rest of the story"....great thread.

 

[Marlin72xs]

Now I know "The rest of the story"....great thread.

I was getting worried when I noticed soft metal flakes in my oil and filters. At first I thought it was aluminum. I felt relieved when I disassembled it and saw the loose plugs. I bought a whole bike 75 with 12k miles. The crank was perfect, as was the cam. So for $250 my engine is now a 447 with Mike's 750 kit. Got 12k on the crank and kit and it's still purring. And vibrating, a little less than before. Still loving it!