Help identifying the Carbs on my GS850 GG 1986 (European)

[Guest]

Hi folks
On a previous thread (http://www.thegsresources.com/_forum...d.php?t=184551) you kind folks helped me establish that my bike is a GS850GG 1986 (European).

I need to buy manifold and airbox boots in preparation for a carb clean.

In that thread RustyBronco made the point that my bike has been modified a fair bit and I should check if it indeed posseses 1986 carbs before I go and buy new parts. He suggested that I...

find the I.D. numbers on the carb bodies or measure the bore diameter to insure they have not been changed to Bs34's. no telling what may have been changed on your bike in the past.

So this is where I need your help please.
Unfortunately I'm not really much of a mechanic (yet) and so I can't take the bike apart to find the IDs (I couldn't see the IDs from the outside, should I be able to? Where would they be?). I need to take the bike and the parts together to the mechanic as he won't dismantle it for me then store it while I source parts, and neither can I take the bike back and forth to him as it's currently not running.

Looking at my carbs while fitted on the bike, they certainly look similar to those in the partslist fiche, but I really am no expert. And when comparing with images I found when googling BS34, well they also looked similar. So I can't really tell the two apart.

So I've taken a load of pictures of the carbs while fitted on the bike in the hope that someone will be able to confirm whether I have the original parts, BS34s or something else.

Many thanks for any help
Assaf

Here are the 1986 parts fiches, if helpful:

http://www.cmsnl.com/suzuki-gs850-1986-gg_model13498/partslist/FIG-02.html

http://www.cmsnl.com/suzuki-gs850-1986-gg_model13498/partslist/FIG-12.html

http://www.cmsnl.com/suzuki-gs850-1986-gg_model13498/partslist/FIG-11.html

and the photos:
View of Carbs from the right side of the bike



View of manifold boot on right side of bike



View of airbox boot on right side of bike



View of Carbs from left side of bike (ie under the fuel cock)
(ignore the stray hose from the fuel cock, that's work in progress)



View over the top front of Carbs from left side of bike



View under the bottom front of Carbs from left side of bike



View over the top front of Carbs from right side of bike



View under the bottom front of Carbs from right side of bike



and the bike itself:


again, many thanks

[Assaf]

For those of you in the US and perhaps unfamiliar with the 1986 model I've done some research that may assist.

It has been suggested that the 1986 carbs are the same/very similar to the USA 1983. So if you are familiar with the 1983, then that may help you identify whether I have the right ones or not.

Firstly, BassCliff and others suggested that the parts I need should be the same as the 1983 model.

In addition, from the parts fiches I see that the manifold boots and airbox boots are indeed the same parts numbers as the 1983 USA model.

Finally, I am no expert, but the carbs look to be very very similar too. The 1986 seems to have some additional small parts in the top left of the fiche (parts 69 to 72: Pilot Screw plus gasket, spring and o-ring).

Do these additional parts mean that the carbs are in fact considered to be quite different from the 83?
Out of interest, what does the addition of these 4 small parts provide?

In short: Am I able to conclude that the 1986 carbs are identical in most respects to the 1983 carbs?

If so, then does that help you tell me whether I have the correct carbs, BS34s or something else?

Again, many thanks for any help
Assaf

Here are the 83 parts fiches, if necessary.

http://www.cmsnl.com/suzuki-gs850-g-1982-1983-usa_model16058/partslist/95273.html

http://www.cmsnl.com/suzuki-gs850-g-1982-1983-usa_model16058/partslist/95283.html

http://www.cmsnl.com/suzuki-gs850-g-1982-1983-usa_model16058/partslist/95282.html

As previously, sorry for the lengthy posts, just trying to do all my homework.

[BassCliff]

Hi,

The stock carbs for the '80 and later GS850G are the Mikuni BS32SS carbs. In the US the "idle mixture screw" (what you call 'pilot screw') was set at the factory and covered with a cap. We were not supposed to mess with that screw according to EPA mandates regarding emissions. That's why many US parts fiches do not show that screw, spring, washer, or O-ring. (We drill out the caps and mess with them anyway.) Measure the head side of your carb throat to confirm the size.


Thank you for your indulgence,

BassCliff

[Nessism]

Those look like the stock BS32's.

[hampshirehog]

BS32s - same carbs as we got in the UK on all the post 1980 850s. The heads of the mixture screws are longer than the US version as we didn't get the little tin cover to stop us fiddling with them. Perhaps we were considered more trustworthy than the Yanks.......

[DanTheMan]

BS32s - same carbs as we got in the UK on all the post 1980 850s. The heads of the mixture screws are longer than the US version as we didn't get the little tin cover to stop us fiddling with them. Perhaps we were considered more trustworthy than the Yanks.......

Naw, your govt' just has older and more well tested methods of screwing around with you guys than ours has with us.

[hampshirehog]

Naw, your govt' just has older and more well tested methods of screwing around with you guys than ours has with us.

Or maybe they realised that as we do most of our carb adjustments with a hammer.......

[Assaf]

You guys are fantastic
Thanks very much

[Assaf]

Sorry for bugging folks, I'm just super nervous about making a mistake and buying the wrong parts etc.

We're saying that these are my carbs, right?

http://www.cmsnl.com/suzuki-gs850-1986-gg_model13498/partslist/FIG-11.html

thanks again

[rustybronco]

Yes that appears to be the correct parts list for your carbs.

what are you trying to get for your carbs?

http://www.cycleorings.com/#BS_Series_O-ring_Kit

[BassCliff]

Hi,

Unless the jets, floats, float valves/seats, etc, are damaged or worn, you should not need to buy any parts for your carbs other than the O-ring kit that Mr. rustybronco told you about. Go to http://cycleorings.com and get the O-ring kit for the CV carbs (yours are Mikuni BS32SS). While you're there, get the new fasteners and intake boot O-rings too. Then follow this tutorial:

Mikuni BS(CV) Carburetor Rebuild Tutorial
(Mr. Nessism)

See this guide for extra information:

CV Carburetor Rebuild Guide
(Courtesy of GSR and John Bloemer)
(Click here to see the CV Carb Notes)

How are your intake boots and air box? See the guides on my website for air intake repair and airbox sealing. Don't forget to look at the valve adjustment guide too.

Keep us informed.


Thank you for your indulgence,

BassCliff

[Big T]

All you should need is the float bowl gaskets and an O ring kit from Robert

And some dip

Boots for both sides are a great idea

[Assaf]

Yes, that's exactly the plan.
I have the o-rings and fasteners on my shopping list plus boots on both sides and have already taken a look thru the tutorial.
I'll add the float bowl gaskets too.

It was just a case of being absolutely sure I have identified the correct carbs etc.

Thanks for all ur help
I believe I am now ready to go

[BassCliff]

Hi,

One more thing. As long as you're replacing all the rubber, you may want to pick up a new set of those rubber pilot jet plugs too.




Thank you for your indulgence,

BassCliff

[Assaf]

that is hilarious!
I was JUST on that page in Z1 having trouble deciding if that was the pilot jet plug, then flicked over here to ask you guys only to find that you had literally read my mind.
amazing