Originally Posted by motolab
If you don't have a way to measure CO%, lower the idle speed below the factory spec. Starting from a setting that is known to be lean (1-1/2 turns is likely but not guaranteed to be), adjust the fuel screw to obtain the highest idle speed. Adjust to 1/8 - 1/4 turn richer than that. Then, adjust the idle speed back to 1500 rpm.
This procedure will work for most other bikes but on the DR650 setting the mixture screw this way will often result in a slight "rich bog" just off idle. If you aren't going to make other changes to avoid the rich bog most riders have good results turning the mixture screw about 1/4 turn leaner
than the highest idle.
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