It could be the throttle position sensor.. Mine SVX had the same problem but if you want to get a quick fix, try this: Start engine Put to reverse Give it some revs AND WATCH THERES NOTHING BEHIND YOU!!! It just might jump back to its place, mine did. And you might want to check the trnsmission oils etc..
Your transmission is gone, you need to rebuild it.
trans is slipping
Something is wrong in the brake.
The reverse on a waverunner works very similarly to the reverse on a jet plane. A mechanism called a "reverse gate" drops down over the jet on the back of the Waverunner. The reverse gate changes the direction of the thrust so that it goes forward instead of backward. With the thrust going forward, the Waverunner goes backward for the same reason it goes forward with the thurst going backward. Note that switching into reverse at speed or using the reverse at high speed or using the reverse as a brake can rip the pump out of the back of the Waverunner. The reverse is only intended for low-speed maneuvering.
could be either transmission shift linkage not engaging reverse ( stops at neutral ) worn joint connectors sometimes cause this. or reverse clutches or gears bad inside transmission.
A reverse idler gear in a manual transmission. It converts the reverse gears turning direction into the outputshaft to reverse its direction. The transmission can not spin clockwise when the reverse idler is engaged thus it only spins backwards not forward.
your problem is the transmission. you need to replace the transmission
you should think about getting your transmission fixed
First thing i would be checking is does the transmission have the rite amount of oil in it.It could be as worse as a snapped transmission converter that goes into the pump on the transmission.(need to take step by step)
parking brake cable may be sticking.
Be sure that when you put the unit in reverse that the blades for the mower are not engaged. That will prevent the mower from operating
If it is a "hobby Grade" controlled vehicle, then the motor needs to be reversed, or there is a switch on the control to switch the motor. (I am assuming that when you put the vehilce in revrse it goes forward.