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4 to 6 psi.
If it's a swingarm-type model use longer shocks, if it's a Softail use shorter shocks. Or you can use height-adjustable air shocks on any Harley with a rear suspension.
With shorter shocks.
You cannot. Stock shocks are not adjustable.
The Road King shocks are air adjustable via an air valve located on the right side of the bike just above the rear tire. Your Harley Davidson owner's manual will tell you what the shocks should be pressurized to depending upon the load on your bike (for instance - if you'll be carrying a passenger - the pressure should be a bit higher than it would be if you were riding solo). Don't even attempt to read the pressure unless you have the specialized "hand pump" that is used to pressurize the shocks. You can purchase this from Harley Davidson or via a third party online. The valve is a typical bicycle / auto air valve - but ... DO NOT attempt to pressurize it with anything but the specialized hand pump. Using anything else will risk over pressurization of your shocks and that's not good. The shocks hold a very small volume of air at relatively low pressure levels - so the hand pump is a must have.
very carefully
i suggest using ONLY a bicycle pump. Never any other kind of pressure and onlly 6 lbs. More will blow them out.
The shocks on a 1999 Harley Fat Boy are not really adjustable. There are kits that lower the bike available on the after market.
yes
35-40 ft lbs
Use a bicycle pump only! No more than 6 lbs.
Simply follow the nylon air hoses from the shock absorbers and you'll find the air fitting, which is the same size as a tire valve stem. Use a hand pump to add air, otherwise you risk blowing the shocks' seals. Recommendations for tire air pressures vary on different brands and sizes of tires, but every tire made, regardless of application, has that information printed on the sidewall.