Announcement

**Boondocks** · 03-20-2007, 03:43 AM

As far as I know, there is no part no. for the pilot screw (terminology used in manuals) for the BS series Mikuni carburetors. This is because the screw is preadjusted at the factory to meet emissions standards and is supposed to be sealed and not user adjustable. That's why you can see it on a fiche without a part number. A dealer might be able to order one for you, or maybe someone on the forum has an extra one. A junkyard might be another option.

You might also try Motorcyclecarbs Specialty Products. They repair and rebuild carburetors, so they should be able to supply a pilot screw.

wiredgeorge also rebuilds carburetors, but I don't know if they sell individual parts.

**Norseman** · 03-20-2007, 08:34 AM

Pilot Screw Search

Thanks for the info, Boondocks. Well, that wasn't exactly what I wanted to hear, but hopefully someone on the forum has an extra they don't need and would be willing to sell it to me? I will ask my dealer if they can order one, if not I guess I'll start the junkyard dance :?...

Norseman

**SqDancerLynn1** · 03-20-2007, 04:20 PM

www.sudco.com carries parts

**j.ess** · 03-22-2007, 12:06 AM

air screw help bs34

I recently came across this problem too. At the factory they fixed the setting for emmision control, and suzuki won't sell them for that reason. I finally found the parts. The Keyster part number is "48-501 1 mk" There is a place selling them in FLA called Mikes XS and they sell them for $10 a piece. They specialize in yamaha but a Mikuni is a mikuni, and you are working on a bs 34 mikuni it think. Check out www.mikesxs.com I am pretty sure about the address, but am on a work computer so I can't check my favorites.

Do me a favor please. On the #3 carb was where I had my worst problem too, and as you know that is the carb you sync off of. I still don't know whether it was factory locked at a setting or not, but I had to easy-out the screw and got excited and just put the new adjuster in without looking. BIG PROBLEM. I ruined the new screw, and actually had to drill out the passage with a pin vice and a #80 bit. You don't want to have to do this. Once you have the screw out, check to make sure you can see all the way through the passage before you install the screw (if you have to pull the screw out of #1 so you can see what you are looking for) they should be identical.

good luck,
ess

**Boondocks** · 03-22-2007, 01:04 AM

Unfortunately, Norseman is working on a BS32 Mikuni. $10 apiece for a pilot screw! Wow.

I bought a complete set of '80 GS1100ET carbs as a spare in clean, rebuilt-like condition for $86. I feel much better now.

**Norseman** · 03-22-2007, 08:17 AM

Thanks for the info

You guys rock - great info! Yes, I'm dealing with BS32SS carbs on a 1981 GS650GL. When I finally got the stuck air screw (pilot screw) out, I did look closely and the passage through at the bottom was nice and open. But thanks for the heads-up.

I am looking at a set off a GS650 carbs of s 198x something year right now. He isn't sure of the exact year. However, they look identical to mine with the exception of the choke linkage. On my 1981 the choke cable goes straight up, and on the set I'm looking at the choke cable is mounted sideways. Other than that they look identical in every way, do you think I'm pretty safe with buying that???

I figure it would be nice to replace the carb with a broken float post, get the spare parts just in case, and get the air screw(s). So you're right, Boondocks, getting an extra new "bank" is the way to go.

Thanks again,
Norseman

**Boondocks** · 03-22-2007, 06:23 PM

If the carbs are the same series and look identical you should alright. The choke linkage is just an addon. The worst case is that the jets might be a little different, but it's probably more likely that they are the same since it's from another GS650. Jets are easily replaceable anyway.

Announcement

Air Screw Part Number

Air Screw Part Number

Comment

Comment

Comment

Comment

Comment

Comment

Comment