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Compression test is a good idea. Also, I would verify cylinders are actually dry. Crank it with plugs out and see if any gas comes out. If they are truly dry, you might have made a mistake when cleaning carbs. How are your float levels?

Forget about resale value. This is a 40+ year old bike that is not highly collectible. Also, ignore whatever the seller tells you. "Ran when parked" is right up there with "check is in the mail", and "I swear ossifer, I had one beer". You will need to do some maintenance on the bike. This is...

It is sandwiched between what Yamaha calls Push Rod 1 and Push Rod 2. Basically, in the clutch basket there is a sort of a mushroom shaped thing that pushes on the pressure plate. That's Push Rod 1. Push Rod 2 is the pushrod we all know and love. There is nothing that retains the ball. If it...

Hard to say what it is without seeing it.

I only vaguely remember this, but I think it did get harder to release. Because the bar was loose on one end, the lever wasn't pushing it quite right.

In general, if you own an old Japanese bike, JIS screwdrivers are a godsend. You probably already have some buggered screws from someone who didn't know about it. The seals quite likely have never been replaced, making them a 40 year old piece of rubber. These bikes are getting to an age where...

Personally, not where I would start. That just sounds like good way to make sure you buy a new caliper. Especially when you are a guy with not a lot of experience, which the OP seems to be. I have seen the master cylinder be the problem at least as often, if not more often, as the caliper...

There are several different models of the 80s XS. Do you have a drum or a disk brake? When a front wheel won't turn, brakes are the problem 90% of the time. It will not move when you start it.

Something is still clogged. Does the carb get fuel in the bowl? You can check by opening the drain on the bottom.

"straight/flat cafe style seat" and "comfortable" are a contradiction. Cafe seats are not meant for comfort. There is no ready-made part that will fit. You have to get a generic one and build the mounting. The older models came with a bench seat, but even that would not fit without modification.

Greetings, silly English kanigit. :D You can still buy the seals new from Yamaha. I always get OEM ones. Part number 256-14997-00-00. Yamaha does not list them for this bike, but this it the correct number. Two things you need to know: The screws that hold the butterflies are peened...

Spring, then ball. Just need to be careful not to launch the ball when you install it.

There you go. High-tension wires do go bad, and it's a cheap fix.

Not necessarily a good assumption. I would look at coils, wiring, and TCI first Test power at coils. Test coils for resistance. Clean grounds. Make sure your fuses are good and the fuse box isn't broken. TCI stands for Transistor Controlled Ignition. They are also called ignitors or...

Kinda hard to say. I would suggest going back to basics: How is your compression? Do you have spark? Is fuel actually making it into the cylinder? Beyond that, I'd maybe check valve clearances.

Airflow is different somehow. I had this on a transverse four, inner two cylinders were different from outer. Parts fiche. That's what factory specifies for them.

Nice. Make sure you slide the fork legs up to match. If you only do the front or the back, it changes geometry, which affects how it steers.

What you are looking for is a JASO-MA or JASO-MA2 certification. Many diesel oils have it. It is usually on the back of the bottle in small print.

I think you are talking about carbs from a DOHC model. It isn't so much that they are newer, they are from a completely different engine. SOHC and DOHC XS400 are different bikes with the same name, and have almost no parts in common. DOHC and SOHC carbs do not interchange directly. I am not...

Never heard of that, but I suppose anything is possible if you are a good welder.