A friend with a 2003 road king is experincing severe vibration during deceleration from any speed. everything seems normal during aceleration through every gear. replaced the front motor mount, no difference. all the vibration seems to be right under the seat, no abnormal shaking in front end or handlebars. rear belt seems awful tight to me but was adjusted by a harley tech. did not have primary off yet. any help in wich direction to look would be a big help.
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Re: vibration during deceleration
The final drive belt may be too tight. After all, Harley techs are human and make mistakes like everyone else. I've made my fair share of them.
The belt is supposed to be adjusted with the rider on the bike. This is difficult to do in the shop but if there's more than one mechanic, it can be done. Your're final drive belt should have about a 1/2" up an down play in it when a force of 10 pounds is applied to the belt on the lower run of the belt. Some bikes have a "guage" built right into the lower belt guard that looks like a slot with markings on the side. You can purchase one the small tool that applies pressure to the belt at the shop. They aren't expensive. Get someone about your weight to sit on the bike and readjust your final drive belt. If you get it too loose, it will squeak when you shift gears.
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Hi Anonymous, first check the wire connections to the horn making sure they are clean and tight, there is power going to it and the ground wire is securely fastened. Then look behind the horn body for a small set screw sometimes with a jam nut. This screw puts tension on the horn diaphram to vibrate alot or vibrate a little. Have someone hold in the horn button while you adjust the screw in or out as necessary. 1992 and later touring models, fuel pump fuses and relays will be behind the right side panel, everything else will be behind the left side panel to access fuses pull back on the front two locking tabs and slide the cover up. Good luck.
There is no seperate pump. The following lines will give you more details
Braking force and the tendency of the wheels to lock up are affected by a combination of factors such as the friction coefficient of the road surface, and the difference between the vehicle speed and the road wheel speed. The ABS prevents the road wheels from locking up during heavy braking by controlling the vehicle's brake system hydraulic pressure.
During normal braking, as the rotational speed of the wheel falls, no electric current flows from the ECU to the hydraulic unit. The solenoid valve is not energized. The brake master cylinder hydraulic pressure is applied to the brake unit, and the ABS is not involved. However, even though the ABS is passive during normal braking, its control module is constantly monitoring for rapid deceleration of any of the wheels.
If a wheel-speed sensor signals severe wheel deceleration - which means the wheel is likely to lock up - the ECU sends a current to the hydraulic unit. This energizes the solenoid valve. The action of the valve isolates the brake circuit from the master cylinder. This stops the braking pressure at that wheel from rising, and keeps it constant.
If the sensors signal the wheel is still decelerating too rapidly, the ECU sends a larger current to the hydraulic unit. The armature moves even further and opens the valve. It opens a passage from the brake circuit. Brake fluid is sent from the brake circuit back to the master cylinder. Pressure in the brake caliper circuit is reduced so that the wheel is braked less heavily.
If the wheel sensors indicate that lowering the brake pressure is letting the wheel accelerate again, the ECU stops sending current to the hydraulic unit and de-energizes the solenoid valve. This lets the pressure increase, so that the wheel is again decelerated.
This cycle repeats itself about four to six times per second.
It is normal in an ABS for the valves in the hydraulic control unit to keep changing position as they change the brake pressure that’s being applied. These changes in position may cause rapid pulsations to be felt through the brake pedal.