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Hi John.
After fitting open silencers to the 620 injection model you should have the CO reading adjusted using the Ducati diognostics computer. This only takes about an hour and will make the bike run considerably better.
As for the idle speed. It is possible that it will drop with these new pipes on as there is less back pressure and so the engine is breathing more freely. If you have a look at the right hand side of the throttle body assembly whilst twisting the throttle you'll see the cam-plate move and the stop-screw which will most likely have a yellow paint blob on it. You'll need an 8mm spanner to adjust it.
I'll post a piccie of the set-up tomorrow.
Cheers.
Lee.
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