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help iam rebuilding a 850 engine .
i got a duplex timing chain witch i have fitted,
when i do up the crank bolt up it locks the crank up .
is this due to the duplex cogs being wider then a single chain.
the engine is a 1961,any help would be great

The two nuts by the bottom sprocket need replacing with countersunk screws.

Here's a pic which substantiates what Simon has said.



Borrowed from DVs book.

a good quality kit should usually have the countersunk set screws with it,,,