5twins

I don't think any of those later rotors will work on a '75 because the offset is different. They only work on '77 and later 35mm forks...

Replacement heavy duty clutch springs are quite cheap usually, like $15 a set or less. Don't get them from Mikes, in fact don't get...

It may be just all crusty inside as well. You'll just need to pop it apart and see. Maybe a good cleaning will fix and restore it.

No, I don't think you oil that type, you run them dry.

You can take the kill switch all apart and clean it as well. Remove the 2 wires connected to it and that will allow access to the 3rd...

I think the start button is sticking simply because it's so crusty, lol. Yes, take it all apart and clean and lube it all up. I recently...

Yes, it looks like you need a new o-ring around the seat. Yes, that could be the issue.

Are the floats brass or plastic? If they're brass, have you tested them for leaks (dip in tub of hot water and watch for stream of...

I never saw plastic floats in BS38s. I wouldn't know what to set them to by measuring. I think the only way to set the fuel level...

The female worm portion is mounted backwards as well, lol. The metal shrouded portion should stick in, not out ..... The part that...

Yes, you need to clean that gas cap vent again before you can do any tuning. No, I don't think it's a common or reoccurring issue. I've...

Yes, the nut is installed backwards. The shoulder on it should face in. That will put the "flats" on the nut out further and make them...

First of all, it's on backwards, lol. Use a socket to take it off and flip it around, then it will be easier to access. Then, get...

Yes, you'll need to remove the point/advance housing covers to get a straighter shot at it, but it works good after doing that.

..... and for #9 and #10, I use a wobble extension ..... I've also changed my tune a little on the 8 large acorn nuts. I only go 28...

Nor are the '80 and later BS34 carbs.

When you do the clutch adjustment, loosen the adjuster up at the lever all the way and do the adjustment down at the worm first. Take up...

If you look closely, it usually is. That small bead of rubber will run in under the rim where the tire isn't fully seated and popped out...

Take another close look at the tire where it meets the rim. There is usually a small single or double bead of rubber there and that...

Raymond, if it were me, one of the first things I'd do is install my favorite handlebars, the Euro bend. That might alleviate your sore...

Lou_TX, you don't need a lathe to make up a spacer for the clutch cable, you can make one by cutting the end off an old clutch cable...

Yes, you need a metal cover that hangs on two tabs and has the knob on the bottom that "twist-locks" into the frame. They were used on...

We're trying to verify that the ignition system (spark) is functioning properly before you go into the carbs again. Sounds like your...

If it's a metal cover with the slots on top and the twist knob on the bottom, then yes, a 1980 version will fit. Anything newer won't...

Just fill those welds in and take a flap wheel to them, they'll be fine. That's not a high stress area. And while you've got the welder...

Well, you could go through all that if you like I guess, but I think it's just much easier to look at the locating pin hole in the...

If you're looking at the keyway in the points cam, that's not the one you check. You need to look at the pin hole in the cam on the...

Yes, with the engine at TDC, the locating pin hole in the cam for the advance unit should face straight up or straight down (depending...

Years ago, we used to clean our gas fouled (wet) two stroke plugs and re-use them all the time. At first we would just scrub them with...

For the charging system, the first thing you'll want to do is perform the simple charging output test. Start the bike and attach a...

Yes, I use them as well. On some bikes, they don't do much but I think they help on the 650. The first one I installed came off my...

Yes, try the 135 air jets. If it's still too rich, go back to the stock pilots and 130 air jets. The 130 air jets will make it richer...

Well yes, rubber grommets will isolate the box from ground, but how good do you think the grounding was anyway with the box loosely...

What you have there is a combination regulator and rectifier, two units built into one housing. Notice the cooling fins on it. I would...

I'm afraid I don't recognize those carbs, at least as a 650 set anyway. They may be from some other Yamaha model like the 400. 27mm may...

Yes, there are many little improvements you can make to these bikes and most don't cost much. Just adding another ounce of fork oil...

Rasputin, no, I can't say I notice much, if any, difference in the drive, but I know it's got to be easier on those damper springs on...

The end of the stock headpipe is a machined metal part. It extents into the headpipe from the sealing flange about the same distance as...

I don't find the lock tabs that ugly, and besides, they blend in so you hardly see them. The TX500 rear wheel I adapted for my 650, been...

If you have leaks, the new chrome on those pipes will blue up badly and almost immediately. Even with no leaks, it's probably going to...

I wouldn't do it. I've personally encountered very stuck sprocket bolts, even had a few break off trying to remove them. They are a fine...

If the clutch pull is really hard after that shop installs your new cable, it's most likely because they didn't oil it. New cables come...

I'll bet those are going to be pretty loud, lol.

Got mine and they look good. All "Made in Japan" BP7ES plugs, no BPR resistor plugs in the lot. I checked the ones I ordered from...

The best and easiest way to check and/or adjust the cam chain tension is to do so while the bike sits there idling. You want to see the...

No, it's not that complicated, but it is quite a lot of work because the motor needs to be removed to get at it. You should be OK riding...

Yes, you need something on that fork, either a fender or a brace (both is best). When you grab that single front disc brake, it puts...

Well, maybe, lol. Mine started doing that many years ago and it was one of the things that pushed me into going into the topend. What I...

That's very possible. BS34 carbs with UNI filters and different, more open mufflers should need bigger jets.

At the moment, best price on a new chain is from YamahaXS650.com. Buying it directly from Yamaha used to be the best deal, but they...