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The springs are 2 years old, installed the winter before last, 245 seat 650 open, They are Comp springs for the cam , I have had the carb off several times this year for jetting & fuel issues, I think I pull the carb @ least once a month on ave & never saw the dark staining before, Is it possible that I could have overloaded the engine? I tried some very large tires last month and lost over 1000 rpm trap with poor shift recovery, max RPM went down to 6k and had some popping, could not tell if it was intake or exhaust, engine just sounded bad.

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Time to figure out what the motor is saying to you It ain't happy Let us know what you find,I would look at the valve spring pressures after checking the valve lash first Make sure there are no broken inner or outer valve springs