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I just had the same thing with my 951. I changed to the spare engine and have the "new" spare torn down to the crank.
Exact same noises/symptoms
Everything in the cam tower looks great.
Cylinders are clean/Pistons look nice
All the rod bearings look new...why did I tear this down again
ONLY thing similiar is the lower balance shaft is also hard to turn on mine.
I'll have the crank out and the lower balance shaft off by Friday night. Maybe I'll see something of interest for you.
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Brent K
SP1 944
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