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I've only had bike few weeks.
It has top end knock w/cold start. 10 minutes of riding goes away. Getting serviced in week.
Guessing good synthetic oli change will help.
Or could it be sign of oil pump going or something?
 

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First the 1800 is a very mechanical sounding engine.

valve adjustments at 8,000, 16,000 etc..

synthetic oil... in mine since New 2005.. currently my 1800 "F" has 92,500 miles
 

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Probably the de-compressor lobe on the camshaft. Some have thought they had a rod bearing knocking.
Some have replaced the cam, others cut off the de-compressor or pressed it of.
Try some different oils, something may happen.
At the top "Search Community" type in "decompressor"
470 results and a picture.
 

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