Help! The Saga of Simples

[SidSanders]

My little IP simplex has had a hard live... shoddily built in the back of Dad's Landy on a long journey it sat unloved for many years until I decided to strip it and build it properly. It was perfect, and it ran soo well.
This was taken the day I finished it.
It lasted just 2 days before getting the hoof of Mother on in as it sat on the raised bench I have (which she used as a step)
It didnt bother me that much... I just rebuilt it again, gave it another coat of paint and all was well... except... sometimes the motor stopped meshing with the gears, and it played up occasionally. So I got a new motor and matching gears, and re0wired it all. Still it would randomly de-mesh.
Then recently I replaced the two rather bent screws that held the motor in.... and it ran perfectly forwards round my new oval of faller track one way... the other way it was rather noisy. Then it suddenly stopped, and there was a horrid noise. It had stripped all the gear teeth of one side of the intermediate gear. WHich I can't take out.
So its now dead again.

[Narrow Minded]

It didnt bother me that much...

First mistake! - You should have wailed and wrung your hands, uttering such things as "all that work", "my pride and joy" and such like.
Then all you had to do was sulk until you were bought a replacement - built that and then rebuilt the original!

Hope that helps for any future mishaps. Sorry I can't be of any help with your current technical problem, I'm completely unfamiliar with the set-up.
One thing to bear in mind though, when it comes to replacing gear sets - try your best to substitute metal for the original nylon (or worse still plastic)

I'm sure there'll be some words from the wise to help you out.

[Sir haydn]

sounds like you have a bend axle or motor core. either way something is out. other than this the axle may not be square. these are just a few factor that could cuse perfect running in only one direction