So ...need a bit of direction-was carbs, not coil pick up

[bikerphil]

Hey Jonny, you can reuse the needle seats if you polish them. Cut a Q-tip in half, put it in your drill, apply chrome polish and buff the inside where the needle sits. Also clean any deposits off the needle itself and visually inspect. New ones aren't cheap (the good ones), but the o-rings are.

[JonnyO]

YAY! Found two things-one, the rubber gasket I couldn't account for after spilling out all the screws and fasteners of the air box ( was laying on a rug behind the bike ) and two, a PICTURE of where I suspected it should go- under the brackets held in by the two philips head screws. For me, a major victory!

[JonnyO]

My experience comes from the necessity of figuring things out while out on the road. Right now I'm a good 30 miles from anything remotely resembling a motorcycle shop let alone a Yamaha dealer. If my carbs spring a leak I've got to find parts that work, having options in finding them is crucial!

Yeah, I hear ya. Self-reliance. Not too bad for a family of four! nyuk nyuk!

[LAB3]

My experience comes from the necessity of figuring things out while out on the road. Right now I'm a good 30 miles from anything remotely resembling a motorcycle shop let alone a Yamaha dealer. If my carbs spring a leak I've got to find parts that work, having options in finding them is crucial!

[JonnyO]

That translates to a JIS (Japan Industry Standard) S8 o-ring, meaning it's a common standardized size (JIS S8) Many auto parts stores keep assortments of single orings behind the counter, they're all over the place in systems that use fuel injection and are labeled by they're standardized size.

Long and short of it, head to an auto parts store and ask if they have single orings and ask for a JIS S8 o-ring, probably won't cost more than some pocket change.

Good suggestion but that's for you more competent mechanics to do. I've not the courage to take a chance that what I found might be up to snuff. I'm getting OEM. lol I bite the bullet and cough up stupid money on certain things because
in my experience I always get the shaft. My best friend Sal used to say, " If the turtle doesn't stick his neck out of the shell he never goes anywhere." And after he tried whatever it was ( installing floors ) and it turned out it was a mistake I'd say, "Oops ...and get's it chopped off!".

[JonnyO]

Jonny0, I rode an XS1B from California to North Carolina in 1974. I had 7 days to report for duty at Ft. Bragg. One of my all time best rides.
Now that I'm 70, the XS1100 will get me around in comfort without the extras the 650 added.
Every State has good and bad parts to it. On a ride, we try to stick with the good parts or roads. Cal. has highway 1 North of San Francisco, Arkansas has their highway 9, and so many more!

Gave me a smile to read of your trip to Ft. Bragg.
My first bike was an XS400 I bought while in the Navy. When we were stateside I was one of the few with a motorcycle onboard. I'd hit ports on the Left Coast ( it wasn't at the time ), offload it and ride to wherever the heck I wanted. lmao
Wish I knew then what I know now.

[LAB3]

Nope! I think this is the correct needle valve seat Oring?

BSR-36 Float needle valve seat

7.5mm I.D. x 1.53 mm

That translates to a JIS (Japan Industry Standard) S8 o-ring, meaning it's a common standardized size (JIS S8) Many auto parts stores keep assortments of single orings behind the counter, they're all over the place in systems that use fuel injection and are labeled by they're standardized size.

Long and short of it, head to an auto parts store and ask if they have single orings and ask for a JIS S8 o-ring, probably won't cost more than some pocket change.

[DiverRay]

Jonny0, I rode an XS1B from California to North Carolina in 1974. I had 7 days to report for duty at Ft. Bragg. One of my all time best rides.
Now that I'm 70, the XS1100 will get me around in comfort without the extras the 650 added.
Every State has good and bad parts to it. On a ride, we try to stick with the good parts or roads. Cal. has highway 1 North of San Francisco, Arkansas has their highway 9, and so many more!

[bikerphil]

Get som PB blaster or equivalent, WD40 is just a mild lubricant. Yes, the heat will soften the hardened rubber. Don't bugger them up with a pliers, go carefully and again, be careful of the posts, one slip and you know the rest.

[JonnyO]

I only use the genuine Yamaha on those seat O-rings, P/N 8F2-14147

Soak the hell out of those seats with penetrating oil before trying to pull them out. I've even needed to heat them with a torch to remove them before. Be careful of the float posts.

I'll get 'em from Partzilla, then. I will take a look at the carbs ( open 'em up ) soon. WD-40 okay as a penetrating oil? I have heat gun, I guess, if necessary. I'm guessing you had to use heat because they were rock hard and wouldn't budge?

[bikerphil]

I only use the genuine Yamaha on those seat O-rings, P/N 8F2-14147

Soak the hell out of those seats with penetrating oil before trying to pull them out. I've even needed to heat them with a torch to remove them before. Be careful of the float posts.

[JonnyO]

Nope! I think this is the correct needle valve seat Oring?

BSR-36 Float needle valve seat

7.5mm I.D. x 1.53 mm

Hope so. Ordered 4.

[JonnyO]

I'm going to take a shot when I get the o-rings for the needle jets... at just replacing those... and see what I get.

[JonnyO]

Yay! \(^_^)/

FWIW? (*′☉.̫☉)

Iffin yur feeling a bit reluctant to do a total tear down, clean, rebuild, adjust, install, and RE-adjust a set 4 (fower...) Mikuni BS-34 Constant Velcity CaburatatorZ??! ヾ(ﾟдﾟ)ﾉ゛

Then imma gonna say there's prob'ly a good reason on yur side of thingz. (／。＼)

I means, ya don't R E A L L Y knows what yur in fOaR and wut to expect OaR DO as it's a "first time thru the Gate" scenario. Iffin that's the case then I heartily recommend you DON'T. Just DON'T. ε=┌(;･_･)┘

There's only so many of these carb banks left and nobody wants to see the bank (and therefore the entire bike...) useless cuz of ruining one....just ONE carb body due to being HAMHANDED 'bout removing a float post, jamming the wrong size screwdriver into the pilot air jet hole and cracking the horn, OaR boogering up the idle fuel screw tip/hole. (－‸ ლ)

I would totally support you taking NO action at all considering at this moment yur deciding NOT to do anything cuz you KNOW that you DON'T know wut you NEED to know. (︶︹︺)

BefOaR making a final decision to act OaR not to act? (O_o)

You might find the following useful-

https://xs11.club/forum/repairs/carb...b-cleaning-101

https://xs11.club/forum/repairs/carb...-1980-81-carbs

This video channel has the mostest detailed and useful videos in this area that I've EVER seen and I've used them as my own guiding light.-

https://www.youtube.com/@Steptoexs11/videos

Know befOaR you go.... ( ﾟ_ゝ｀)


OaR DON'T go if that ends up being the case. ¯\_(°_°)_/¯

Awesome! TY! :-D

[JonnyO]

Jets-R-Us is a good source, just make sure you're purchasing OEM brass. They also offer aftermarket carburetor parts.

Nice Cycle Supply is another good source. Genuine Mikuni Replacement Parts and Tuning Components

Here's another gold mine. The 1980-1984 XS650 have BS34 carburetors very similar (not the same) as on the XS11. In the link you will find all kinds of goodies such as o'rings, fasteners, and Suzuki branded parts that are identical to Yamaha at a better price.

(11) The great o-ring, seal, gasket, nut, bolt, sizes used on the XS650 thread. | Yamaha XS650 Forum

The 650 is my favorite bike of all time. ( don't tell 1100 gurus! )
From commiefornia to Louisianer it was a great steed to me.