Harley Davidson FLHTCUI Electra Glide Ultra Classic - Popular Questions, Answers, Tips & Manuals
WIRING DIGRAM, 2001 ELECTRI GLIDE, BACK OF SPEED OMOTER HOUSING
The black box located on the right side of the speedometer housing of a 2001 Harley-Davidson Electra Glide may be a sensor or module. Its purpose cannot be determined without a wiring diagram or specific information about the model. It's suggested to refer to manufacturer's documentation or seek assistance from a professional for clarification.
2006. Why does it have bad vibration at idle?
Something rotating is out of balance or perhaps it is reciprocating parts that aren't adequately compensated for.
Balancing an engine is a science almost akin to the black arts and almost everything that moves can have a surprisingly large effect. You are fortunate the vibration is happening at such a low rpm though harmonics of the original vibration can occur at higher rpm.
I remember a harsh vibration that ran through a car just above idle. The car had just had a new clutch fitted - the cause was a 5/16 spring washer had broken during tightening the clutch cover and had dropped unnoticed to the floor. Fitting a new washer cured the vibration.
Not everything is balanced on most production engines and not to a particularly high tolerance and it wouldn't be surprising if something slipped through. Balancing an engine properly is a necessary part of preparing an engine for competition - a balanced engine is less stressed and is more reliable and longer lasting. Sit in a car with a balanced engine and take it up to full revolutions and if it wasn't for the tachometer and the exhaust and intake roar you wouldn't know the engine was running at all, something that can't be said of most production engines...
If your vibration is new it could be a reason to be concerned but if it has always been there, probably not...
Harleys have been noted for vibrations in the past and it could be worth asking a local dealer for an opinion.
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