5u D2 questions

I am restoring 5u D2. Is the fuel line from line from the factory copper or steel.I have my starter clutch out. I want to go through it. My pinion brake did not work. Are the clutch discs suppose to have a backing on them, Brass disc's, or the brake disc's.How can you tell if they are worn out. Thanks

Factory fuel lines from tank to fuel pump were steel, copper is more prone to stress fatigue and cracking from vibration so was not used much. Starting clutch discs did not have any facing on them, just metallic brass and steel. Same goes for the brake discs, they are just steel-on-steel. Whenever I have a starting clutch apart I always put a bevel on the discs that are driven by the clutch drum, just dish them by about .020" and leave the other discs flat. Doing this will help the clutch spring itself apart when not engaged, it reduces the drag of the whole assembly. Don't bevel the brake discs, leave them all flat because you want drag on them. When metallic discs are all flat to each other and covered in oil, they really like to stick to each other so having every-other one in the stack dished a little helps the brake work like it should. As far as clutch disc condition, so long as they are still a uniform thickness and not thin in the wear areas or scored, they're still good.

They were steel. But....I used copper tubing on two of mine. Silver soldered the fittings. Installed one line twelve years ago and haven't had any problems to date, but all of my machines just see occasional use.