Need some help with a 1980 Suzuki GS850G with fouled carbs

[fer_gloko]

the previous was running open carbs, the plugs are faul, and the 3rd carb was backfiring.
it has 32mm Venturi size, according to manual it should have 115 main jet STOCK.
the guy was running 165 making the bike run too rich.
what do you guys recommend if im gonna run pods, I figured something between 130-145? i want to know what you guys are currently running or any help would be great.

 

[fer_gloko]

my fist bike and new to this site, picked this bike up last weekend of CL for $750 under 25K miles on it View attachment 37598

 

[steve murdoch]

Welcome to the site.
I would spend my money on the stock jets and check the Classifieds for a stock airbox.

 

[GSX1000E]

It would help to know where you live, what elevations you plan to ride in and which pod filters you are planning on using before I could give a close recommendation.
With that said, and if you are running the stock exhaust, try 120 main jets for a very good starting point.

 

[Joe Guilbeau]

Check my signature links

 

[tom203]

?.
I would spend my money on the stock jets and check the Classifieds for a stock airbox.

Too late, once the pod urge strikes, forward!

 

[Guest]

I'd check and see if there is a jet kit installed with the 165 main jet.

 

[fer_gloko]

I have the stock airbox, but I like the pods look

 

[fer_gloko]

I'm going to be running universal filters http://www.bikebandit.com/aftermark...-universal/emgo-clamp-on-universal-air-filter

I live in San Francisco so 52 ft, I have a 4 to 1 exaust

 

[GSX1000E]

With those filters, you will need to glue the metal to the rubber intake using some black weatherstrip adhesive and allow to dry for 24 hours.
Also, you will NEED to cut out sections of the shelf that is inside that BLOCKS air to the air jets at roughly 4 & 8 o'clock positions to match the carbs.
130 or 132.5 main jets might put you into the Ballpark. May have to raise the jet needle one shim worth by replacing the plastic spacer with (4) 3mm flat washers.
Try the main jets first with those modifications to those filters and don't forget to oil them also.

 

[fer_gloko]

So I don't know how to check I there's a jet kit but, I would asume so because the bottom metal part attached to the diaphram (don't know the name) has been drilled to have bigger wholes
If you zoom in you can see that they have been messed with.

 

[Nessism]

Go through the carbs properly. That means unganging them and cleaning all the various passages. My signature contains a link to a carb rebuild tutorial which can assist.

For jetting, get a Dynojet kit. It will save you significant headache and/or save your engine from lean mixture abuse.

 

[GSX1000E]

Since your carbs appear to have already been destroyed by someone installing a jet kit, perhaps you should start with either another set of 32mm 850 carbs or, better yet,
a set of 34mm CV carbs from a 1000 or 1100 model. Do as Nessism suggested and clean them thoroughly using his guide.

 

[Steve]

Try the main jets first with those modifications to those filters and don't forget to oil them also.

I checked with EMGO (the manufacturer of those filters) to see if they are supposed to be oiled, and found that they are to be run DRY. They are just like the disposable filter you put in your car, just paper. When they get dirty, you replace them. Good thing they are cheap.

.

 

[JJ]

I checked with EMGO (the manufacturer of those filters) to see if they are supposed to be oiled, and found that they are to be run DRY. They are just like the disposable filter you put in your car, just paper. When they get dirty, you replace them. Good thing they are cheap.

IMHO, they are some of the worst filters you can find. At least they keep out rocks and large pebbles.

 

[GSX1000E]

I have been using oil on them for over two decades. Do what you wish with yours.

 

[londonboards]

Drilling out the hole in the carb slides is, I believe, a modification used when you install the jet kits. It would equalise the pressure on those rubber diaphrams quicker than the normal size holes. This is done to make the throttle slides snap up faster which could be called "faster throttle response".

I am not sure that if you take the carbs back to original jetting with standard airbox that these oversized holes will interfere with the operation of the bike or not.

Someone one here will be able to clarify this I'm sure.

Greetings

 

[fer_gloko]

Those are not the same ones I'm getting some that are generic filters from a manufacturer around San Francisco, the shop that I go to gets wholesale price. I didn't want to spend $ 130 on K&G filters. The shop re emended the other filters if I didn't care about the brand.

 

[Grimly]

Drilling out the hole in the carb slides is, I believe, a modification used when you install the jet kits. It would equalise the pressure on those rubber diaphrams quicker than the normal size holes. This is done to make the throttle slides snap up faster which could be called "faster throttle response".

I am not sure that if you take the carbs back to original jetting with standard airbox that these oversized holes will interfere with the operation of the bike or not.

Someone one here will be able to clarify this I'm sure.

Greetings

Interesting. That would mean the standard, small hole, would be the simple way of having an SU damper equivalent. Enlarging the hole would be akin to running thin or no oil in an SU dashpot, which some do for some racing or other applications.
Leaving the hole large, but with standard jetting, would (perhaps I push the analogy too far) effectively do away with the damper and lead to lean stumbles on acceleration, I believe. The whole point of the damper is to damp fluctuations of the piston, but also to provide a reluctance to rise on throttle-opening, thus ensuring extra fuel is drawn out of the main jet and provide an accelerator pump effect.