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For all the naysayers, you should look under your bike. You may find that on the M8's the bottom of the engine/oil pan hangs BELOW the bottom of the frame rails. In that case you HAVE to use frame protectors. (They should probably be called "Engine Protectors" for Road Kings and "Shock Protectors" for Softails)
Here is a quote from the Harley "Frame Protectors" product page...
"A must for softail models to provide the clearance necessary to keep lift pressure on the frame and not the shock absorbers"
They were sold by HD to protect the bottom of the real Dyna, the bottom frame has a skid rail to protect the oil pan from speed bumps or other raised obstructions in the road.
For all the naysayers, you should look under your bike. You may find that on the M8's the bottom of the engine/oil pan hangs BELOW the bottom of the frame rails. In that case you HAVE to use frame protectors. (They should probably be called "Engine Protectors" for Road Kings and "Shock Protectors" for Softails)
Here is a quote from the Harley "Frame Protectors" product page...
"A must for softail models to provide the clearance necessary to keep lift pressure on the frame and not the shock absorbers"
Strange, your Road King, and my Street Glide Special share the same frame/engine. My engine (at it's lowest point) does not hang below the frame rails. Yes, it's close, but the jack does not contact the engine/oil pan.
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