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We have a '78 XS400 with a disc rear brake. The rear brake has started locking-up occasionally. Seems like the MC does not bleed back after the brake is released. I am sure the problem is the MC because I can release the brake by loosening the bleeder screw. Is there a MC available or a kit for...

Still working on the '78 XS400E. The last thing is fork seals, finished that today. I searched for seals for the XS400 and found none. No dust boots either. I measured the fork tubes and ordered seals and boots for a Honda CX500, 1978/79 model. The seals and boots worked perfect. The Yamaha...

Due to a noisy starter motor I am cleaning the starter motor parts inside the motor. It was very dirty and full of junk. My question....the starter motor has a planetary gear in the drive part. What should I lubricate the planetary gears with??? I do not see a lot of wear inside the starter...

On a '78 XS400 I am having some trouble with the plug wires and caps. Do I need resistor caps or plugs and how can I replace the plug wires without buying new coils???? The bike is running now but I can see trouble ahead.

As you all know I have been working on this '78 XSS400 for a friend. The bike is ride-able but there are some problems. I put new pads on the rear and rebuilt the caliper, the master cylinder seemed OK. After about 3 miles the rear brake pressured up and began to slow the bike down. The brake...

I have been working on this 1978 XS400E since July 4th and it is running and almost ready for it's first ride, soon as we can get a tag for it. The only problem left to solve is the turn signals have stopped working. The lights light but do not flash and there is a buzzing or whining noise...

I need a piston for the front caliper on my '78 XS400E. There may be several Yamaha pistons that will fit. Parts fiche list the piston as NLA so a good used one will do. If you have the piston give me a price shipped to 73762. Also I need a rear wheel, the disc brake type. Oh, never-mind, I...

I am not necessarily a beginner, this is my first post on this forum, but I am new to Yamaha XS400. I am helping a friend restore(we hope) a '78. Bike is mostly complete and in fair shape. I have a lot of experience putting old bikes back in service but with Hondas. I am trying to clean the...