Yup use up the previous parts, then switch to the newer style.
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Quick carb verification, please.
- Thread starter EeastCTRider
- Start date
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- bs34 bs38 carbs 34 carburetor
Do BS38 bowls fit on BS34 ?
No, about the only interchange part BS38 - BS34 is throttle shaft seals, mebby diaphragm cover screws, idle stop screw?
You can swap 1980 BS34 bowls with 1981 bowls to gain the valve. You can take bowls of XS1100 right side to get a valve on the right, but only the 1981 has them and maybe XJ1100.
EeastCTRider
XS650 Member
gggGary, did your yellow discolor too or is the because the other may not have been filuel line as you said?
I haven't had any tygon discolor or harden. I've even used up most of that 50' roll of "medical Tygon" it works fine, just swells a bit.
I used to get translucent blue fuel line from an ultralight airplane distributor. It also was great stuff, and I preferred the blue color but don't have a current source for it. I have a chunk that I've been using to drain fuel tanks etc for decades. it's still soft and flexible.
You made me look LOL
https://www.aircraftspruce.com/catalog/appages/bluefuelline.php
The aircraft distributors are pretty good about weeding out piss poor products.............
Killing their customers is generally hard on business.
I used to get translucent blue fuel line from an ultralight airplane distributor. It also was great stuff, and I preferred the blue color but don't have a current source for it. I have a chunk that I've been using to drain fuel tanks etc for decades. it's still soft and flexible.
You made me look LOL
https://www.aircraftspruce.com/catalog/appages/bluefuelline.php
The aircraft distributors are pretty good about weeding out piss poor products.............
Killing their customers is generally hard on business.
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Ha....I didn't think the Tygon was gonna be controversial. It didn't get hard or swell, but it did go from translucent yellow to semi-opaque brown. Attached is pic of exact product used:
You made me look: This has been in, dunno, 5 years? It may be bit stiffer then when new. But has fared better than the pink overflow lines that come on the VM34s.
Mostly but not always non ethanol fuel.
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Just to add to the consensus my '80 SG has the 34's with brass floats and and the drain plug on the bowl.
Tygon is a registered trademark name. As we're all aware (or should be) the Chinese don't give a fuck about trademarks. There's plenty of fake Tygon out there. If you want the real stuff, buy from a reputable dealer. 3+ yrs now on my bike.... still soft, flexible and yellow.
Caveat emptor.
Btw... we've had this conversation before. Can't seem to find it right now....
Tygon is a registered trademark name. As we're all aware (or should be) the Chinese don't give a fuck about trademarks. There's plenty of fake Tygon out there. If you want the real stuff, buy from a reputable dealer. 3+ yrs now on my bike.... still soft, flexible and yellow.
Caveat emptor.
Btw... we've had this conversation before. Can't seem to find it right now....
Gary does that blue line ho hard over time? I wad thinking about getting some.
Not really? I just coiled it now. It did yellow a bit. So now it's kinda greenish blue. Label says parts unlimited 1/4"ID
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If you want black rubber line, I found some really nice stuff at YamahaXS650.com. It's thin wall just like the original so the anti-kink protection springs fit over it. Best of all, they sell it in bulk (25' roll) which is nice if you have multiple bikes and extra carb sets. It's quite reasonably priced as well .....
https://yamahaxs650.com/product/black-rubber-fuel-line-1-4-x-25/
When it comes to floats, O.E.M. or genuine Mikuni are best. Most of the aftermarket ones are pretty poor quality. Buying them from Yamaha is pretty much out of the question as their prices are outrageously high. But you can get Suzuki ones (same part) for a much better price. The 1980 BS34 brass floats differ from the earlier BS38 ones and I haven't been able to find a low cost Mikuni replacement like I did for the 38's. But if I needed to replace them, I think I'd make the switch to the plastic ones as they practically never go bad, and they actually cost a few dollars less .....
https://www.partzilla.com/product/suzuki/13250-44080?ref=56effa58763ad658ef407e618a6d5738324b7135
But PartShark is the place to get them .....
https://www.partshark.com/oemparts/partsearch/suzuki?partsearch=13250-44080
https://yamahaxs650.com/product/black-rubber-fuel-line-1-4-x-25/
When it comes to floats, O.E.M. or genuine Mikuni are best. Most of the aftermarket ones are pretty poor quality. Buying them from Yamaha is pretty much out of the question as their prices are outrageously high. But you can get Suzuki ones (same part) for a much better price. The 1980 BS34 brass floats differ from the earlier BS38 ones and I haven't been able to find a low cost Mikuni replacement like I did for the 38's. But if I needed to replace them, I think I'd make the switch to the plastic ones as they practically never go bad, and they actually cost a few dollars less .....
https://www.partzilla.com/product/suzuki/13250-44080?ref=56effa58763ad658ef407e618a6d5738324b7135
But PartShark is the place to get them .....
https://www.partshark.com/oemparts/partsearch/suzuki?partsearch=13250-44080
EeastCTRider
XS650 Member
Wow this thread grew legs, nice. I was busy at work and couldn't read until now.
Who would guess LOL! That did answer what size line I should look for!
As always, solid info!
Thank you, I have not been into them but I have a feeling these carbs are going to want some extra lovin in the form of $ so saving some is always a plus!! I am headed out now to measure them and take some pictures.
Note: that was an after-market tank & petcock. I think I'm using 5.5mm ID on OEM petcock (smaller).
Get a pic something like this, comparing engine side to engine side. These are XS500 carbs compared to 650 ones and as you can see, there was quite a difference in spacing ......
..... but I made 'em work, lol .....
..... but I made 'em work, lol .....
EeastCTRider
XS650 Member
So I had a ruler and some carbs. Top is, what I was led to believe, xs400 carbs and the bottom is the xs650 carb. Measurements are in mm for the metric fans. I don’t have a way to measure cm right now. 
seems there is a mm difference is distance apart so alignment would have been an issue. Out of curiosity I measured the choke lever and that is different as well. What measurements would you all like to see?
seems there is a mm difference is distance apart so alignment would have been an issue. Out of curiosity I measured the choke lever and that is different as well. What measurements would you all like to see? EeastCTRider
XS650 Member
so yeah, I am metrically inept lol! Don’t tell the missus, she is a math teacher and I’ll have lectures on conversions all week.. conversion therapy of sorts.. 
