I have just had an 06 Eiger 400 engine rebuilt.This machine has not been run in awhile. mice made a nest in clutch,all cleaned out ,but is clatters at idle speed. Will go away at higher speeds and runs fine,still breaking in motor only low engine rpms and have only gone 1 mile at that,dont want to mess this new built. Will this noise go away or Im missing something/ any help is appreciated. Thanks for the new membership