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from my old motorcycling days. Unscrew the two screws that hold the fat end of the throttle, and when they split you will see a ball or small cylinder attached to the wire. Slip this out and either rethread a new and lubricated inner cable or pull the cable outer from the socket under the throttle and replace both. I would advise against using the screw down nipple connector as shown in the thumbnail image as they always pull out in time. Good to keep one in your riding jacket though for a quick roadside fix..
Simple solution: One of the two throttle cables has broken. Replace both throttle cables, and your problem will be solved. (Throttle cables on the Roadking are neither particularly expensive nor difficult to replace & adjust.)
throttle cable ??? should actually have a throttle rod that goes to a very short piece of cable. and this cable only goes from the carb to the throttle rod. the cable is actually easy to replace. it's only 3 inches long. the throttle rod or trigger requires removal of one side of the handle.
What year model. Take tank off. Take cover off throttle on handle bars. Release tension on throttle cable by loosening cable adjusters. Release cable from carburetor. Release cable from throttle housing on handle bar. Reverse instruction to install new cables ...2 cables.
To replace the throttle cable, first loosen the adjustment on both cables getting as much slack as possible in both cables. Then remove the two screws that hold the right switch housing together. Carefully seperate the two halves of the switch housing. Work the cable out of their slots in the throttle sleeve. Do not lose the ferrels on the ends of the cables but do take them off. Work the broken cable out of the lower switch half.
To get the cable loose from the carburetor, you'll probably have to remove the fuel tank. With the fuel tank off, you can work the cable out of the cable stop and then out of the throttle plate linkage on the carburetor.
To install the new cable, first slide the new cable up through the hole in the lower switch housing. Then put the ferrels on the ends of both cables and work them back into their slots in the throttle sleeve. Carefully reassemble the switch housing halves back together being careful not to pinch any wires.
Then reconnect the cable at the carburetor throttle plate linkage and insert the new cable in the cable stop. Adjust the cable so that you have just a bit of freeplay in them and check to see if the throttle will snap closed on it's own when cranked to wide open throttle position and release. Make certain that the throttle works correctly. Put the fuel tank back on.
I'm sorry but I can't send a diagram via this site. I have no idea where I can get a diagram either.
But, to replace the throttle grip on your Softail, you'll see the not only are you replacing but you're replacing the throttle sleeve as well. This actually makes it easier.
To replace the grip, first loosen the throttle and idle cables as loose as you can at the adjusters close to the throttle grip. Then remove the screws that hold the two halves of the throttle switch housings together. Carefully seperate the housing halves as much as the wires will allow.
You'll see the cables coming up and connecting to the throttle sleeve. Each cable will have a ball and a ferrell on it. Work both cables loose and slide the throttle sleeve off the handlebar.
Now, lubricate the inside of the new throttle sleeve, the cable area of the throttle sleeve and the handlebar with fresh white lithium grease. Slide the throttle sleeve up on the handlebar and work the cables back into the throttle sleeve. Be careful not to lose the ferrells. They must be in there for the throttle to work properly.
Once you get the cables installed into the sleeve, put the switch housings together and install the bolts. Before tighten the bolts slide the throttle up onto the handlebar until it stops. Then back if off about 1/8 to 1/4" or so. Tighten the bolts. Readjust the cables leaving just a bit of slack in the throttle cable.
With the engine off, twist the throttle to wide open throttle and let go of the throttle grip. The throttle should snap shut. If not, loosen the cables a bit or back the throttle grip a bit further off the handlebars. The throttle grip must work correctly or serious injury or death may result. This job must be done correctly. It's not difficult just make sure it's right.
Remove the seat, tank, and airbox. Follow throttle cable from the grip to the carbs seeing which way it is routed. Unscrew throttle housing and note which way the cable goes. Make sure when you replace the cable there is free play in the cable. Do not make the cable tight. Give slack in the throttle. Tighten. Twist throttle 10 times to make sure that there is no binding and a good snap! Chaz Moto DC
If you're talking about the old style throttle cable that is internal of the handlebar, it's pretty straight forward. Remove the throttle grip, the rollers and pin for the plunger. Pull the plunger out bringing the old throttle cable with it or at least out far enough to loosen the small set screws that lock the cable in. Now, run the new cable through the outer housing. put the end of new cable into the plunger and tighten the set screws. Replace plunger into the handlebar, replace pin and rollers, replace throttle grip. Now, set the throttle to full closed posititon. Move carb throttle lever to full closed position. With throttle cable through clamp tighten screw securing cable. Check for proper operation of throttle mechanism.