Another Carb Issue??

[Crazcnuk]

They should be fine, but a bit pricey for me, so I used the Plasti-dip spray repair method.

[DGXSER]

If you could spin the diaphram are you saying it spun on the slide assembly? or spun in the carb? There is supposed to be a tab on the outer diameter that will match a space in the carb body top.

When dipping carbs, as others have stated before, watch you dont get your butterfly seals in it, they are hard to replace if they can be had and will cause vacuum leaks if the cleaner gets them.

Yeah, sounds like they are lean to me, stumble until warmed up, and then WOT stumble, running out of fuel.

[foreda]

Diaphram

If you could spin the diaphram are you saying it spun on the slide assembly? or spun in the carb? There is supposed to be a tab on the outer diameter that will match a space in the carb body top.

When dipping carbs, as others have stated before, watch you dont get your butterfly seals in it, they are hard to replace if they can be had and will cause vacuum leaks if the cleaner gets them.

Yeah, sounds like they are lean to me, stumble until warmed up, and then WOT stumble, running out of fuel.

I meant that it spins on the slide assembly. I have already replaced the shaft seals or are you talking about the little brass half moons that are riveted to the butterfly?
The shaft seals I bought from MikesXS.

[DGXSER]

ok...mine do not move on the slide I know.

I meant the shaft seals on the butterflys, or whatever the real carb gurus talk about when they tell folks to not dip the butterflys I never took mine down that far.

Did you make sure both sets have the same jetting?

[TopCatGr58]

Has anyone bought the 34 mm diaphrams from Mikes XS and if so , do they work ok?

I have not measured them so I don't know IF they are 34mm, but they are labelled for the BS34 carbs, which are the later model carbs, the 80-81 series. They are larger, wider than the earlier model carbs, and will NOT work with the 78-79 year carbs.

I've checked the Yamaha microfiche, and the part #s for the early 650 carbs...77 as well as the 79 are different than the ones for the 79XS11.

But I don't have a 650 bike/carb to truly verify this for the OTHER slide that is listed for the BS38 carbs.

I know folks have stated that all of our carbs were BS34's, just different series, but the slides ARE different sizes between the early and later ones, and the slides that Mikes and PNM offer are only for the later model carbs!
T.C.

[foreda]

Diaphrams / Slides

I have not measured them so I don't know IF they are 34mm, but they are labelled for the BS34 carbs, which are the later model carbs, the 80-81 series. They are larger, wider than the earlier model carbs, and will NOT work with the 78-79 year carbs.

I've checked the Yamaha microfiche, and the part #s for the early 650 carbs...77 as well as the 79 are different than the ones for the 79XS11.

But I don't have a 650 bike/carb to truly verify this for the OTHER slide that is listed for the BS38 carbs.

I know folks have stated that all of our carbs were BS34's, just different series, but the slides ARE different sizes between the early and later ones, and the slides that Mikes and PNM offer are only for the later model carbs!
T.C.

Ok.. That's not what I was hoping for!! So is there anybody that sells the diaphram/ slide assembly?

[TopCatGr58]

Yes, regrettably BIKEBANDIT, are you ready??

7: DIAPHRAGM ASY
21390-001 Enter 0-99 $231.71

Might be better off finding a used bank, or getting a bank of later model XS11 carbs, not as fine tunable, but parts are more available?
T.C.

[foreda]

Yikes!

Yes, regrettably BIKEBANDIT, are you ready??



Might be better off finding a used bank, or getting a bank of later model XS11 carbs, not as fine tunable, but parts are more available?
T.C.

Again.. Not quite what I was hoping for. I have some spares but like me, they are old. Reckon I am going to be bidding on ebay soon.
If I were to spend that kind of money, I might as well just replace with an after market set of carbs but I want to stay original.

[Crazcnuk]

The diaphragms come up as a set of for on EBay all the time. The used to sell for around $100/set, but with $34 shipping!

The ones on there now are $156/set, but I didn't check the shipping.

[foreda]

Diaphrams

The diaphragms come up as a set of for on EBay all the time. The used to sell for around $100/set, but with $34 shipping!

The ones on there now are $156/set, but I didn't check the shipping.

I've seen these but I do not think they are for 78-79? Don't know how the diaphrams come off or how to change just the rubber? Anybody done this before??

[tw1980]

Yeah it's not that hard but you have to be careful.The set I got off ebay had instructions.Get a small bottle of zippo lighter fluid to use for lubricant.Then I used a small screw driver to push the diaphragm into the slide.I marked where the notch was with a sharpie.Also it's a good idea to remove any burs from to screwdriver before you start. Terry

[foreda]

Old Rubber

Yeah it's not that hard but you have to be careful.The set I got off ebay had instructions.Get a small bottle of zippo lighter fluid to use for lubricant.Then I used a small screw driver to push the diaphragm into the slide.I marked where the notch was with a sharpie.Also it's a good idea to remove any burs from to screwdriver before you start. Terry

How did you get the old diaphrams off of the slide?My 78-79 slides look to be glued.

[Crazcnuk]

Well, the pros have a special press to pull the top plastic ring off.

Somewhere on this site is a description where he cut that top ring to get it off, but has no problems with it falling off after.

[petejw]

diaphram replacement

Heres a link to the carb diaghram replacement i did not to long ago.

http://www.xs11.com/forum/showthread.php?t=21345

this was for later model carbs, not sure if its the same for the early models.

hope this helps you out a bit.

[foreda]

Late models

Heres a link to the carb diaghram replacement i did not to long ago.

http://www.xs11.com/forum/showthread.php?t=21345

this was for later model carbs, not sure if its the same for the early models.

hope this helps you out a bit.

The diaphrams/slides in your thread are obviously for >80 models. These look completely different from mine. Also, all of the diaphrams I see for sale on ebay and other sites are for 1980 models and up. Thanks for the information, I am going to cut an old one I have apart to see how it is put together.