I have an older model of the Rivarossi 844. I had to re-motor it recently, and I think I messed up, I installed a Radio Shack motor of about the same size. The motor is mounted at an angle to connect to the gears, unlike the new ones where the motor is parallel to the drivers. My problem is that when I run the loco it speeds up 2x a fast when it nears the tracks w/the feeder wires and when it is far from those tracks it goes really slow. It is a DC set up. jaijef Thanks for any advice or help.
Long as it is running smoothly its probably an OK motor. I think your problem is track voltage though. You need a couple more power feeders to the track. Try using 12 guage wire and run a couple track feeders to other points in the loop.....Mike
My first question would be, what type motor did you use? Brand name that is, and then what was its normal operating voltage, 12 VDC, 14 VDC etc, and then how clean your track is, an how many rail feeder wires (as said above) do you have on the mainline, an how long the mainline really is, to the size (output) of your power pack in volts, an amps. Depending on the motor, it could be a low voltage motor, (low draw), not needing much voltage to run, that is good, but then dirty track will cause this, so will few feeder wires from the power pack. BUT, if its a high voltage motor, (high draw), needing alot of amps an voltage, drawn from the pack on clean track with few feeders its depending on the motors draw to get the amperage, an voltage to the commutator. BUT also, dirty track casn make this effect even worse! So, in all respects of these issues, I would need to know what type motor you used (brand name) and also its recommended voltage, an if you have a few or alot of mainline feeder wires to try an say what problem you actually have. I'm remotored around 10 of the older AHM/Rivarossi FEF, 4-8-4 UP loco's an they all ran like scared jack rabbits, and would next to pull the paint off the wall, the owners/ customers were very pleased with the effect the new motor gave the loco's preformace. IF (BIG "if" here), the motor is extremely fast, add some weight! it could also be loosing possitive elecrical contact as well.... ( I too wittnessed this trouble), till I added some extra weight in the boiler (the older AHM/Rivarossi loco's were lacking in tractive effort an that left them spin alot an not have the weight to pull a long train.
