Question about 2004 BMW R 1200 CL
Yep, most of these bikes do rattle on startup. The noise is from cam chain slack. A hydraulic tensioner is used in the engine on each side as there are two cam chains. The tensioner leaks down after the engine sits for a while and the chain rattles for a few seconds till the tensioner gets pumped back full of oil again. Once the chain is tight again, then no noise.
BMW came out with an improved tensioner (doesn't leak down as quickly) that you can install on your engine to fix the rattle. Note that it is much easier to change the RHS tensioner than the LHS one.
Posted on Sep 04, 2010
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Posted on Jan 02, 2017
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