gs 850 carb help needed please

[Steve]

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

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.

.

[JTGS850GL]

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
Forum Sage Super Site Supporter


Join DateAug 2013LocationGrayson, GAPosts2,863




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.

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.

[mjpcarbon]

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

[chuck hahn]

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.

[mjpcarbon]

got it , and will do
thank you

[chuck hahn]

First turn the darned screws IN till they are 2 out from gently seated and start there. It may still stumble and have a crappy idle at that point but thats OK. Adjust the screws at 1/8 turn intervals and see if its an improvement or is worse. If they egt all the way to say 1 turn out and its still for crap then thats telling you its even too lean for the adjustments on the screws to be of any use.

So, if the screws cant get it leaned out..then youre being told by the bike that its down below. Start with going lower in the pilot jets and mains.

All this is exactly why so many of us preach to make it stock and leave it that way. All the "lets make it look cool and sound bas azz " mods effectively makes these bikes a useless exercise and waste of time and money.

[Steve]

... I was trying to get it going without trashing the work I had done

Rather impressive, and the first time I have seen something like that.

Probably because it seems to be counter-productive.

As the air rushes by those pipes, they will be drawing a vacuum, trying to suck the air out of the carbs.
Most people want to stuff more air INTO the carbs.

They should work OK while sitting still, but going down the road will be another matter entirely.

Looks good, but that does not mean it will work well.

.

[mjpcarbon]

Chuck I will heed your instructions, had this been my build and not a basket case I can assure you there would be many more stock parts on this namely the airbox for starters. I am 55 yrs old and this is not my style but have to see it thru.
There is a second bike that was part of the deal and rest assured I have already been on ebay for the missing parts

[mjpcarbon]

chuck I was away,
Did what you said two turns in on the mixture screws and the idle is crappy but runs a little bit better 1/8 throttle then it stumbles,
Should I drop the needle down a groove ?