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gs 850 carb help needed please

  • Thread starter Thread starter mjpcarbon
  • Start date Start date
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mjpcarbon

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I have an 82 gs 850 running no air box and an open exhaust system.
The carbs are rebuilt as per the wonderful instructions I found here and a stage 3 dynojet kit installed per their instructions. The bike starts just fine hot or cold( cold needs a bit of choke) idles great but stumbles and misses at nearly all steady throttle positions. if you really crank it the bike gets happy for a couple seconds. Also while unhappy it pops thru the carb and exhaust at crusing speeds.
Pilots are 4 1/2 turns out and I even raised the needle one groove but still not happy
 

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ok....where did you come up with 4 1/2 out on the screws.

Got pods or just an open intake to the carbs..no filters??


Open exhaust...yeah that never works out well.
 
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4 1/2 turns out per DynoJet instruction sheet, thank you for correcting me on the Mixture screws because I don't sound stupid enough having no filters and open exhaust.
Yes open stack no filters and I hear ya on the exhaust, the bike was slated to be a just around town local bike.
Your help and advice are appreciated
 
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The thing is that the exhaust will also effect flow and has a monicle of control on how rich or lean it runs also.
Look at the plugs..use new ones that arent already discolored and run it a bit and then pull then to see how they look.
And the CV carbs like a bit of restriction at the intake side so get some pods at some point. But in the interum do this...
Get 4 zip ties long enough to go around the intake side and use some Tshirt material and cover the throats with a square held on with a zip tie. start with 1 layer and youll see a vast throttle response improvement. Dont like it at the 1 layer..then try 2. Basically your tricking them to think they are sucking air thru a pod.

You need some filtration control and you need to read the plugs and heed what they are saying. Ashy whiteish grey and the carbs are too lean...sooty black is too rich. My bet is they are too rich right now. But get some covers on the front of the carbs and see what happens.
 
Its not that ONE MAGIC THING that gonna make it run good and right..its balance of ALL the factors. All the valve adjustments done and to spec...timing set right..no vacuum leaks in the intake manifold orings..carbs vacuum synced with the gauges... proper air filter / air box. Its all relivant and works in concert on these bikes.
 
thanks Chuck will do on the t shirt tomorrow eve.
I have pulled the plugs on several occasions and they are always dark flat black.
 
OK but were they old plugs or new ones after you did the dyna kit??

The top mixture screw is all that there is on a CV carb to adjust the mixture thats allowed in. Not how much air to fuel ratio though. The fuel and air ar premixed in the needle jet ( the one the main jet is screwed into ). Turning the top screws in will put LESS premix into the cylinders and thus make it run LEANER..out obviously allows more mix in and it runs RICHER.

So if new plugs turn black they are telling you youve got the screws out too far. And so on if they are whitish grey. See how it all gels now??

And at the top of the carb/ fuel/ exhaust section in the tech area youll see STICKYS at the top..read them!!!
 
Chuck the plugs were black post jet kit.
Gonna get on it tonight with fresh plugs and some adjustments
thank you
 
Got adjustable jet needles?? May need to drop the needles a tad. This will also lean things out a bit. And like I said before, the only adjustments you can make in the bowls is going with smaller pilot jets or mains. Find some cheapo pods for right now at the local shop. Dont over oil them either. to much oil is like having a stuck on choke. Just a LIGHT mist is all they need...just enough to make the dust stick to them.
 
So tonights carb adventures consisted of going back to the 3rd from the top needle(dyno jet spec) 4 1/2 turns out on the Mixture screws,165 main jets and t shirt over the open carbs. Idles and starts great but now it is unrideable even the gentlest bit of throttle causes the engine to faulter. Man oh man I have never felt so defeated. No matter what I change the machines reactions change but never improve.
At this point I am at a loss as to what any possible solutions might be. Craigslist is looking better and better every time I take the carbs off the bike
 
The plugs were black AFTER you out the kit in....as you stated right And we know what will lean the carbs out a lot right??? But you still say the screws are at 4 1/2 . Turn the screws IN 2 full turns and see what happens. Sounds like its DROWNING itself outright.

Start there and see if theres any improvement..leave the make shift Tshirt filter on..1 layer. Just why did you put the kit in in the first place? Never did know that.

Put your location in the signature and ask someone to come by and help. Its easier for an experienced person if they are there to witness the bikes actions first hand.
 
DynoJet info came from here and I will screw the mixture screws in
Thank you very much for trying to help me

03-27-2015, 11:12 AM #12
JTGS850GL
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[h=2]
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[/h] With no airbox at all it will idle but will not run much above that. If you plan on running without the stock air filter then be prepaired to purchase some quality pod filters (K&N or APE) and pickup up the Dyno-Jet kit. If not then it will be a LONG drawn out exercise in tuning it properly. Yes, it has been done without the kit and cheap pods but MUCH more hit and miss on the jetting.
 
You notice your not getting much help? Because your giving motorcyclists a bad name by running around with open exhaust. Most members will shy away from assisting you

Quit while your ahead, there is no way to properly tune that setup
 
Actually Jeff I hadn't noticed but thanks for pointing that out. I really didn't think this forum was comprised of tightasses like yourself. I rather thought they were a nice bunch of guys willing to help fellow bikers despite their exhaust preferences.

I appreciate you taking the time to critique me rather than offer help.

So should I just put the bike out by the curb OR perhaps douse it with gasoline and burn it in my driveway. Perhaps not the latter because the smoke might offend someone.

Hey Jeff thanks for nothing

Mark
 
mjpcarbon said:
Actually Jeff I hadn't noticed but thanks for pointing that out. I really didn't think this forum was comprised of tightasses like yourself. ... Hey Jeff thanks for nothing
Click to expand...

Attitude also goes a long way around here. :-\\\

Unfortunately, Jeff is right. There are several of the carb gurus that are not posting here. Might be because they have not seen it, might be because also have objections to loud pipes. I am one that will not intentionally provide help for carb jetting when straight pipes or open exhaust is mentioned, but I don't usually come out and say "sorry, but I won't help you", I just read the post and shake my head and wonder why some of our motorcycling freedoms (rights?) are being revoked.

"Tightass" or not, it is just as much my right to withhold information as it is your right to have your loud pipes.
The biggest difference is that one of those actions is legal, the other is not. :oops:

.
 
mjpcarbon said:
DynoJet info came from here and I will screw the mixture screws in
Thank you very much for trying to help me

03-27-2015, 11:12 AM #12
JTGS850GL
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Join DateAug 2013LocationGrayson, GAPosts2,863


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With no airbox at all it will idle but will not run much above that. If you plan on running without the stock air filter then be prepaired to purchase some quality pod filters (K&N or APE) and pickup up the Dyno-Jet kit. If not then it will be a LONG drawn out exercise in tuning it properly. Yes, it has been done without the kit and cheap pods but MUCH more hit and miss on the jetting.
Click to expand...

Gee, I see how well you followed my advice. You did go get the DJ kit but still no pods and you're having troubles getting it going. Go figure.

As for the open exhaust, as other have stated, it a matter of PI$$ING off the neighbors and giving all riders a bad reputation. I won't hold back information because of it, but it sure would be better if you corked those pipes a bit. Would make tuning a little easier as well.
 
All comments aside, kinda sad that someone, anyone would have knowledge and not want to help.
This could go on and on and that is not my intention... I am glad to live in America
The tightass comment was rude and in poor taste but says it best.
I hope doctors never share their likes and dislikes

Jt it wasnt about no listening at all I was trying to get it going without trashing the work I had done
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OK.......TO ME ANYWAY...it sounds like its runningb rich and the plugs are black all the time. Correct me if I am reading things wrong here.

You need to LEAN the carbs out..no way past that fact.

The first..and easiest way..is to adjust the mixture screws at the top rear IN to lean it.

Other things to do are ..
Go lower on the pilot jet size.
Go lower on the main jet size.
DROP the needle into the needle jet by moving the circlip on the needle toward the TOP OF THE NEEDLE.

Be well sure the carb body passages are super clean..the fuel to air ratio is mixed via the needle jet. So if the air jet passage ( air jets are in the front face of the carb throats) arent letting in sufficient air then its a rich mixture right from the bowl...follow me???

And you may even need to insert bigger air jets. Some people will even drill the holes bigger with micro drill bits to get more air into the mix.

There arent a whole lot of components to be flucking with in these carbs. Its obviously got plenty of unobstructed intake air source.
 
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