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I like to think that I'm above average mechanically. Maybe I can pull this off. Thanks.

I'm sure dreading taking my XS1-B down for a top end rebuild. I have it running great, and I'm almost afraid to mess with it, especially with summer just around the corner. It burns oil, the cam chain is stretched out, and occasionally it beaches a cloud of smoke when starting it. The bottom end...

So I have a 1971 xs1-b 650 with unknown miles. No history from the previous owner, and no speedometer on the bike when I bought it. I have no idea about the actual mileage, but I'm guessing a lot. The cam chain seems to be stretched out enough that I can't set the ignition timing correctly. I...

Is it possible to get carbs not to leak when you leave the petcocks on? The needles and seats look fine, and the floats are set at exactly 25mm. I ordered new needles and seats but they sent the wrong ones. It's not a big deal to just shut the gas off. I was just wondering. My bike is a 71 xs1-b...

Thanks to everyone for the input. Helicoils it is. A M4 X 0.7 kit is on order. It should arrive on Monday. I visited six stores and the kit isn't available locally.

The carb bowl screws are M4 X 0.7

My bike is a 1971 Yamaha xs1-b. It has Mikuni carbs. They are 38s. There are stripped float bowl screw holes on both carbs. I am thinking about getting slightly longer screws, and putting a nut on the back side. I'm sure open to the right way to fix this problem. Thanks

On both of my Mikuni 38 carbs, there are stripped float bowl screw holes in the body of the carburetor. Any suggestions? I was thinking about buying slightly longer screws, and putting a nut on the back side. Any better suggestions? 1971 Yamaha xs1-b. Thanks!

I can't say about the sprocket. I should count the teeth. I'm making progress on how it runs. I'm just not there yet. It runs better now than it has since I've owned it. When it hits 3500 rpm, it takes of like a rocket.

Thanks for the info. I should probably go through the whole ignition system. The advance mechanism was froze up when I got the bike so it may not be exactly right yet.

Why is my 71 xs1-b low on power from idle to 3,500 rpm? Stock everything. BS38 carbs cleaned as well as I can get it.130 main jet, and 145 pilot jet. I think I will try a 147.5 pilot jet as soon as I get out of this cast. The mufflers are not stock, but they aren't straight through pipes.

They now live at my house with new filters. I just put them on my bike about 30 minutes ago. Now I can get rid of the pods. I'm trying to figure out why I'm really low on power below 3,500 rpm.

Thanks to all for the information. Now I know. My xs1-b could use some help in the handling department that's for sure. When I owned my original back in 71, I didn't realize how bad the handling was.

Why are tx750 swingarms special? I have seen them mentioned several times in various posts. Thanks

Hi there, I have a 72 speedometer that I was running on my 1971. Cosmetically very nice. It bounces a little around 60 mph. I used it for 1,325 miles until I found a nos 71. $100 plus shipping.

Hey there, I'm interested in the air filter boxes. Just not sure if they will fit my 1971 xs1-b. They look the same, but I have heard that they are slightly different size. Please provide price and any info you may have on fit. Thanks, Roy

Sorry, I didn't explain that very clearly. For lots more money than a seven inch sealed beam headlight costs, you can buy a headlight reflector that uses a replaceable bulb. The replacement reflector uses all the original attachment points used by the factory when new. Why can you adjust that...

Thanks for the info. If I ordered the original replacement reflector for this bike, would I have the same issue?

I am using an automotive sealed beam headlight in my xs1-b. The sealed beam fits up against the chrome trim ring on the front of the headlight bucket. It is held in place by little wire retainers. The problem is I can't tip the headlight bucket down far enough to properly align the headlight...