Carburetor identification and setup help

[Woodstock1976]

Bike is a 79 xs650 special 2
Currently has Ascot Tracker 2-2 exhaust and mikesXs pod filters.
The carbs are ok but I wanted some fully restored ones so I got these carbs from BarryW in the Uk and I need some help to set these up to run on the bike I have because they look a bit different so I’m assuming they are a different year.

Ive read a lot on here especially 5twins posts about identifying the carburetor year first so I’m hoping they will chime in to give me some pointers. Thanks for all the help in advance

 

[gggGary]

That's some weird shit you got there! Not 78-79 carbs fer-sher.
Looks like they're prolly 74-75 carbs, one choke with cross over tube, low venturi bottom. dual throttle cables, they wouldn't have had that top bracket stock.
I'd check ALL The brass, make sure it matches those year bodies, you might find some odd stuff inside em.
Why would you have gotten carbs from the UK???

 

[Its been a long time]

Bike is a 79 xs650 special 2
Currently has Ascot Tracker 2-2 exhaust and mikesXs pod filters.
The carbs are ok but I wanted some fully restored ones so I got these carbs from BarryW in the Uk and I need some help to set these up to run on the bike I have because they look a bit different so I’m assuming they are a different year.

Ive read a lot on here especially 5twins posts about identifying the carburetor year first so I’m hoping they will chime in to give me some pointers. Thanks for all the help in advance

Be very careful what you find. I have experience of that person overhauling carburettors. What he does is very pretty. But I wouldn't recommend anyone using him if you want properly functioning carbs rather than just pretty ones. Sorry for not being more positive about it. Good luck sorting those out though.

Edited to add - I see the word Solex on the carburettor top cover. So, that bit itself is very early? The cross brace between the carbs is definitely off later BS38. I am guessing that you could have a real mongrel set of carbs there.

 

[Its been a long time]

That's some weird shit you got there! Not 78-79 carbs fer-sher.
Looks like they're prolly 74-75 carbs, one choke with cross over tube, low venturi bottom. dual throttle cables, they wouldn't have had that top bracket stock.
I'd check ALL The brass, make sure it matches those year bodies, you might find some odd stuff inside em.
Why would you have gotten carbs from the UK???

If it's the same Barry W, in the UK, he trades through eBay as something like bluesmokebaz or similar. I am guessing he picks up a fair bit of business all over. You might guess from my post above I can't recommend using him.

I think you will find some weird stuff inside those. They may not even be Yamaha bits originally. Sorry to be gloomy.

 

[Woodstock1976]

Ahhhh great lol well worst case the ones on my bike are not too bad thanks for the info to start.
If you were going to use these carbs where would you start?
I can take them apart and identify the jets and take photos of anything

 

[KPaco]

Bike is a 79 xs650 special 2
Currently has Ascot Tracker 2-2 exhaust and mikesXs pod filters.
The carbs are ok but I wanted some fully restored ones so I got these carbs from BarryW in the Uk and I need some help to set these up to run on the bike I have because they look a bit different so I’m assuming they are a different year.

Ive read a lot on here especially 5twins posts about identifying the carburetor year first so I’m hoping they will chime in to give me some pointers. Thanks for all the help in advance

Question? Were the carbs sent reconditioned? If so I’m surprised to see no hose clips fitted! That would set of alarm bells as to internal build quality!!?

 

[John Regular]

Question? Were the carbs sent reconditioned? If so I’m surprised to see no hose clips fitted! That would set of alarm bells as to internal build quality!!?

Sorry to but in but just wanted to clarify, so hose clips are a no go? A rookie move, not that I would use them or anything, just in case I see them used on someone else's bike. that is not me, because they are not on my bike right now.

 

[John Regular]

Sorry to but in but just wanted to clarify, so hose clips are a no go? A rookie move, not that I would use them or anything, just in case I see them used on someone else's bike. that is not me, because they are not on my bike right now.

Disregard, I just realized that you said "no hose clamps fitted"

 

[Woodstock1976]

Yup no hose clamps anywhere apparently I shouldn’t have gotten these at all lol

 

[Its been a long time]

Ahhhh great lol well worst case the ones on my bike are not too bad thanks for the info to start.
If you were going to use these carbs where would you start?
I can take them apart and identify the jets and take photos of anything

IMO, you're on the right track. Take everything completely apart and note any markings. Post pictures here and those with more knowledge than I can identify what you have. Hopefully the parts will all be compatible with each other. But in your shoes, knowing what I know, I wouldn't take anything for granted. Good luck.

 

[Woodstock1976]

Took them apart just the bowls and tops
Needles look like they say y22? And are in the middle position
Main jets are 140 they look to be the only pieces not cleaned or replaced 1 was even stopped up lol (Im starting to think I fell for something)
Other jets are 42.5
The slides look very nice.
Would it be possible that I could use some of these parts in my 79 carbs? The insides all look the same from when I cleaned the ones on my bike but the internals look nicer on these

 

[gggGary]

Note the chart I included in the post above details what brass should be in the various years of carbs. Use what the chart says to start.
78-79 carbs are usually considered to be the best fitted to the XS650 OEM.
I'm a fan of BS34s with a couple mods also..

 

[Its been a long time]

Took them apart just the bowls and tops
Needles look like they say y22? And are in the middle position
Main jets are 140 they look to be the only pieces not cleaned or replaced 1 was even stopped up lol (Im starting to think I fell for something)
Other jets are 42.5
The slides look very nice.
Would it be possible that I could use some of these parts in my 79 carbs? The insides all look the same from when I cleaned the ones on my bike but the internals look nicer on these

Please take a look at the picture in post #2 up the page. That should give you an idea of what you need depending on what year those carburettors actually are. I am sure you'll get the assistance you need beyond what I can tell you.

I can't say I'm surprised what you found with the main jets in there. You might expect (as I would) that a full refurbishment would include all new brassware.

 

[gggGary]

The borg here is pretty firm on using ONLY genuine jets, orifices, needles.

 

[5twins]

Yes, you have quite the assortment of parts there, lol. The carb bodies look to be '76-'77. I say that because it looks like they have the casting on the bottom front to mount the angle that the '76 and later carbs used, along with that top butterfly shaped bracket, to make them into a "bank". The butterfly shafts have been changed to '75 or older ones, and those #125 butterfly plates are from '73 and older carbs. Newer carbs used #120 plates. The Y-22 needles are generic from some rebuild kit but are wrong for those carb bodies. They may only work in the '70-'73 bodies with the raised floors. They're too short by about 5mm for any of the later BS38s and would run way too rich. The bowls could be any where from '72 to '77, I can't tell for sure unless you show me some better pics (bottom and inside top). There were two bowl types used, one that takes BS30/96 pilots and one that takes VM22/210 pilots. The difference is in how the air is fed to the pilot jet .....

You'll need to pull the needle jets and see what they are. That will determine what needle you need, and the rest of the jetting as well because it's based on the needle and needle jet combo. That 140 main is a replacement. No 650 carb set came with a main that big. Last thing, the slide type is '77 or older.

 

[John Regular]

Yes, you have quite the assortment of parts there, lol. The carb bodies look to be '76-'77. I say that because it looks like they have the casting on the bottom front to mount the angle that the '76 and later carbs used, along with that top butterfly shaped bracket, to make them into a "bank". The butterfly shafts have been changed to '75 or older ones, and those #125 butterfly plates are from '73 and older carbs. Newer carbs used #120 plates. The Y-22 needles are generic from some rebuild kit but are wrong for those carb bodies. They may only work in the '70-'73 bodies with the raised floors. They're too short by about 5mm for any of the later BS38s and would run way too rich. The bowls could be any where from '72 to '77, I can't tell for sure unless you show me some better pics (bottom and inside top). There were two bowl types used, one that takes BS30/96 pilots and one that takes VM22/210 pilots. The difference is in how the air is fed to the pilot jet .....

View attachment 338730

You'll need to pull the needle jets and see what they are. That will determine what needle you need, and the rest of the jetting as well because it's based on the needle and needle jet combo. That 140 main is a replacement. No 650 carb set came with a main that big. Last thing, the slide type is '77 or older.

I thought all BS38s were the same. I'm going to go pull out the ones in my big ole boxes of parts that I got when I bought the latest project. Just for fun. The bike is a 1980 and if I read correctly didn't come with 38s?

 

[5twins]

Yes, if it has the original carbs with it, they would be the first year of the BS34s (brass floats, drain plug bolt like the 38s). Really, they're not a bad carb once you "fix" the factory lean settings. And mark my words, in the future I think they will become the stock 650 carb of choice. They're lighter and more modern than the 38s, and actually more tunable because the pilot air jet can be changed.

 

[John Regular]

Yes, if it has the original carbs with it, they would be the first year of the BS34s (brass floats, drain plug bolt like the 38s). Really, they're not a bad carb once you "fix" the factory lean settings. And mark my words, in the future I think they will become the stock 650 carb of choice. They're lighter and more modern than the 38s, and actually more tunable because the pilot air jet can be changed.

Well as luck would have it, they magically turned into 34s since I last saw them, or my memory is totally going to sh!t. I might be in the wrong multiverse this keeps happening. Anyway the PO coated a bunch of parts with whatever the carbs have on them, cera coat maybe? Bike also has 34s and PO said that he already put the right jets in them. I just nodded and said "cool" having never dealt with 34s before