Quote:
Originally Posted by utopia
"It should be remembered that on desmodromic valve timing systems, any increase in opening clearances will automatically decrease the closing clearances, and vice versa. If you change the opening shim you must therefore also change the closing shim."
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If the clearances have changed due to wear/carbon build-up etc. this maybe the case as the system, as a whole, may have moved but simply changing an opener shim won't affect the closer clearance.