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Asking $20 it’s been painted but has no dents and is straight!

Just a smaller rear gear. And a slightly larger rear tire. The 120 was redline about 9300.

The fuel injection was just too much $$ I finally got the Sun World Racing carbs working perfectly! Turned this bike into a beast!! Super responsive throttle! I actually kept up with a 2007 Honda goldwing up till about 120mph! (With a bigger cam and 2 into 1 exhaust) All I had to do was replace...

Complete bs34 carburetors asking $140.

Selling my 77 xs400D $2,500 obo Lots of new parts! Runs great but does have an idle issue! 13,000 miles. I repainted the frame, built a custom seat and side panels. The tank is off a 1981 xs400 (4.5 gal). Lots of new parts!! New; points, condenser, coils, plug wires, plug caps, plugs, handlebar...

I’ve given up on the swap to fuel injection... way to much money and work!!!! So I’ve decided to stick with these SWR... “Sun World Racing” carburetors. So far I’ve had no luck getting them to idle but, top end..... I can only describe as “MORE THAN FUN!!!!!!!” But........ On (cold) startup...

I’ve already spent too much money on mine also, but..... I am keeping up with my buddy’s CBR500R!! So....

Yeah!! EFI parts. I’m looking for parts to match air flow. But I did some jetting changes in these new carbs and I seem to be getting it close!! Lol! Supercharger??!! nice!!

SICK!! thanks!! Already ordering parts! I’ll try to get some pictures of the upgrade!! Thanks again for the help xs400 guru!!!

Someone to make a fuel injection kit for these bikes!!! Imagine the fun!

I’ve been trying several days to contact (SWR) Sun World Racing. About these carbs. There are no diagrams or anything about these carbs. And no reply’s to any of my emails! Does anyone know of any quality replacements?

Just looked again at the stock bs34 carbs and seems that one of the diaphragms isn’t moving freely! I’m tempted to get new ones and start over with the original carbs!!!

That’s what I was afraid of!! I’ve spent several hours trying to tune these things and nothing but problems!!! I can get it to idle with the chokes on but it’s running really rich!! As soon as I cut the choke out it runs lean for a second and then won’t idle! A slight touch of the throttle and...

has anyone here done the carburetor swap to the MIkesXs SWR (Sunworld Racing) 32mm? I’ve recently swapped mine and am having some trouble tuning them. Has anyone got them to run??

Perfect! Thanks!! Got a timing light! Left side was advanced a little! Runs like a dream now!!!! I’m loving these new carbs!!!!!

new (lubed!!) throttle cable, intake manifolds, (S.W.R. Flat slide carbs) and gaskets! No leaks or sticking there!!! Auto advance is moving freely!! Still have the same problem!!??? Checked the timing (Statically) still right on!! Getting a bit frustrated!! Any other ideas???!!!???

Thanks!! I will check that out!!

my 77 xs400 is having some idle issues!! I cleaned and rebuilt the carbs. Got new points, condenser, coils, plug wires and plugs. Did a static time and synced the carbs. Everything was running perfect until a couple weeks ago!! I was out on a ride and the ide started staying high!! I figured it...