Author Topic: Main nozzle BS38 carbs  (Read 109 times)

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Offline Joffa1

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Main nozzle BS38 carbs
« on: February 22, 2019, 08:10:50 AM »
Hi there I have recently ordered rebuild kits for BS38 CV carbs in my 76 XS500C

What Im trying to determine is the following:

the Main Nozzle is the push in type with O Ring. The existing one in my carb is a Y6. Im trying to replace it as its ovalled. All Ive been able to find is the z6 which is the part for the 76 XS650 with the same BS38 carburetors. 

It looks almost identical but if a different part number.

Does anyone know if this part is a direct swap or know where I can find a y6?

Thanks so much.

Offline Joffa1

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Re: Main nozzle BS38 carbs
« Reply #1 on: February 22, 2019, 11:05:32 PM »
So this is the part I have and then the replacement part Im looking at buying...


Offline Joffa1

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Re: Main nozzle BS38 carbs
« Reply #2 on: February 22, 2019, 11:12:48 PM »
Part number 4 on this diagram

Offline guylr

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Re: Main nozzle BS38 carbs
« Reply #3 on: February 23, 2019, 03:28:09 AM »
The Z6 is a full size richer than the Y6 main nozzle so you would likely need to lower the needle to lean the off idle and mid range up mixture. Now because fuel these days has 10 or 15% ethanol in it the mixture can stand to be slightly richer than it was in 1976. So if you can't find the original 341-14941-96-00 part I think the Z6 might work fine.

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

Offline Joffa1

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Re: Main nozzle BS38 carbs
« Reply #4 on: February 23, 2019, 04:23:38 AM »
Thanks so much Guy. Id rather find a Y6 but I dont know where? If I do end up having to use a Z6 I would assume they both need to be Z6 in each carb?

Offline Joffa1

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Re: Main nozzle BS38 carbs
« Reply #5 on: February 23, 2019, 05:15:32 AM »
And just one other thing could you identify the bottom right jet there for me ?

I couldnt find on my parts diagram. Is it removable because one of mine looks damaged like its tried to be pryed out.

Offline Joffa1

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Re: Main nozzle BS38 carbs
« Reply #6 on: February 24, 2019, 10:18:26 AM »
Choke jet maybe?