Thanks for all the comments and help. I just was not happy with the shoddy running of Percy so remotored it endex. Here's how if anyone's interested and I apologise if this has already been done. I am just being a irritating Newby!!
The old motor was removed and the worm dipped in boiling water for 15 seconds, pulled off and whilst still warm, slipped on to the new motor which I got from ebay for £11.00 and they are still for sale right now. It is a very well made and massively solid Flat can 5 pole skew wound motor like the Mashima 1833. The outer can casing is .018" thick anodised steel. It is made to last. It preforms faultlessly. Well Well chuffed ( Sorry!)
As you can see I have cut off bits of chassis I did not want and removed the Piston rod valve thingey as the critter will end up a Diema like Diesel.
The motor cage was knifed off and motor mount binned. Then I very carefully knifed down the two sides of the plastic chassis until the motor sat at the right angle ( Don't overdo it) and meshed with the worm wheel. Before SEWING the motor on I soldered on two new wires to the contacts so that they face rearwards.
Then two 1mm holes drilled through both sides of the chassis where you see the cotton thread attached to the motor.
Waxed the thread with beeswax and with a needle I sewed the motor on tying a knot at the top to secure, cut the wires to length and soldered them to the motor terminals.
Test ran the chassis to make sure the worm and wheel were nicely in engagement. Not too tight not to loose. Chassis ran like melted butter, Big smiles. It worked!!
I then finished up by epoxying the motor at strategic points to the chassis.
Wait ten minutes to harden then Test run again.
Bearing in mind that this motor is brand new and not ran in I clocked it as taking 28 seconds to cover 38" of Peco Flexi Track. Now that is SLOW and I am more than pleased in fact ecstatic with the new manned up Percy.
Sorry If I have deviated from my first critter EFFIE but I hope it's all related..Ie getting a decent chassis to run our critters on.
Still waiting for my rivet press!! to continue with EFFIE. Will keep you posted. I just want to get my hands on it and rivet the hell out of everything.
It's not what you make it's how you make it.