Author Topic: 73 carbs for 77 xs500 engine  (Read 201 times)

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Offline dailydose1

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73 carbs for 77 xs500 engine
« on: July 14, 2018, 04:40:15 PM »
Hi,

Has anyone used the older carbs on the newer model? Did you have to go up jets? Or is it even possible or worth just buying the newer carbs?

Offline guylr

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Re: 73 carbs for 77 xs500 engine
« Reply #1 on: July 16, 2018, 03:53:56 AM »
The BS38 Mikuni carbs and parts for them are far more common then the earlier Keihins found on the 73 through 75 model 500s. They are found on all of the XS650 models up to 1979. The Keihins used a different airbox plenum and carb mounting joints too. The XS500E used the later BS34 II carbs that are also very common but again use a different airbox and carb joints to fit them.

Guy
Now Retired Yamaha guy. Cut me and I bleed "Cinquasia Red"

Offline dailydose1

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Re: 73 carbs for 77 xs500 engine
« Reply #2 on: July 17, 2018, 04:17:54 AM »
Looks like I should be on the hunt for some bs34 II carbs and boot. Mine only came with one boot and no carbs :/

On a side note, the boot has a port on it with a rubber tube, is that supposed to connect to the other boot or what is that for?