My rear shock is too soft.the bike is 14yrs old

Check the rear shock absorber and spring. Some bikes have preset 'notches' to raise and lower the ride height. You will need to raise the bike on a SAFE centre lift to take the weight off the rear suspension arm to adjust it. Most bikes have it set to the middle notch as standard. If the shock assembly is still too high you might need to replace the shock And spring to a shorter, stiffer set.

14-21 psi, on older bikes, it like air bag.

Sorry I do not go back that far so if the shocks are not air shocks you can likely adjust them by turning the spring to a higher or lower setting and if air shock you need a special shock air pump to raise ort lower the air pressure. Use of a regular pump will not be accurate and an air supply more than 50 psi will likely destroy the shocks in any case.

The front forks are adjustable to the type of ride you want. First, set the rear shock to the setting you want soft, medium, or hard. There should be max pressure information in your owners manual and on a sticker on the front forks. Typically the most pressure that can usually be put into a Honda front fork is around 14 PSI. Add, carefully, 10-12 PSI using a hand or foot bicycle pump with a gauge on it. You will probably find this way too stiff. Be careful not to put too much pressure in the forks or you will pop the seals and have to replace them.Then with the bike loaded the way you are going to ride (soft for comfort or hard for two up riding) bounce on the seat. What you want to feel is the front and back suspension dropping at the same time. This is how racers set up there motorcycles for hard cornering. If both the front and rear of the cycle drop together you have an easier time controlling the bike during extreme maneuvers. Since the front is usually stiffer than the back(you added pressure there) slowly bleed the pressure out of the front fork tubes until the the front and back drop together while you are bouncing with the bike loaded the way you are going to ride. Now you are set up for extreme riding conditions. Soft or hard that is how you set up all motorcycle suspensions by balancing the the amount of front cushion/pressure to match the back cushion/pressure.

Hi.

Depends on what you want to get. In theory the fork can be between 0 and 43 psi. In practice if you put 40 psi it will be completely stiff and seals may start leaking.

In practice the front take 0 to 12 psi, and rear shock from 7 to 21 psi.

If you need street performance put more pressure. Settings for comfort in long travels will require lower pressure.

Here tables from service manual:

FRONT



REAR:

Rear shock absorber air pressure can vary from 0.5 kg/cm2 (7 psi) to 1.5 kg/cm2 (21 psi) as the road conditions become more severe or the load increases.

For the front here below the procedure from service manual. I suggest staying far from the 43 psi limit suggested if you do not want to break the seals.

8. Make sure the front wheel is off the ground and inflate the forks to 0-0.4 kg/cm2 (0-6 psi). Do not use compressed air; use only a small hand-operated air pump.
CAUTION
Never exceed an air pressure of 43 psi (3.0 kg/cm2) as damage may occur to internal components of the fork assembly.

Set them on the firmest selction.
On my bike i use a soft setting when i ride alone and a firmer setting when carrying a passenger.

340 lbs is a big man, use the firmest selction.
If that is too hard drop one setting, but you don't want to be too soft and bottom out the rear tire to the rear fender.

You do not have to put any air in the forks. There was a sticker telling you maximum pressure on the bike. It may still be there. Maximum pressure is not more than 14 pounds. You will never need more than 7 or 8 pounds. First set the rear shocks for a hard or soft ride. Then holding a bicycle foot pump with a pressure gauge on it in your hands , give it one pump (do not go over 10 or 12 pounds pressure). Now bounce on the seat and bleed pressure out of the forks until the front and rear shocks drop at the same time. Your bike suspension is now set up correctly for riding.

shocks are fine, there is a mixtre of air and fork oil in the air shocks. if u want to check, u need a air pump that screws on and has an air gauge on it. harley sells the one for your bike. proper psi is at 13 psi.

yes, the rear shocks use air pressure to adjust the ride to exactly the way you like it. Only problem is that you don't want to go to your local fuel station and use their pump. You should have gotten a small hand pump with the bike. If not, you can get one at your local dealership or order an aftermarket pump. It usually takes somewhere around 5 psi for most people, I think. The reason I think is that I've never owned a air suspension bike and never asked anyone how much air to put in the system. Some bikes even have air front forks. Seems the air fitting is in the end of one of the grips or something.

fork psi should'nt exceed 9psi. fork air valves are best used for removing air. spring preload should be adjusted to abtain the correct sag (1'' on most street bikes)