Setting up mixtures

[mudcow007]

how do you know when the mixture is setup correct?

is it a case of adjusting an just checking the plugs?

or is there a more scientific method....

gracias

[A100man]

Plug colour is a decent starting point I think. Some folk also use ColourTune (google is your friend).. if you're rich (I mean wealthy - not too much fuel) a rolling road session.
____________________
Now: A100, GT250A, XJ598, FZ750

Then: Fizz, RS200, KL250, XJ550, Laverda Alpina, XJ600, FZS600

[lihp]

[mudcow007]

yep tried book settings an it runs like a bag of spanners, richer makes it run better but i have a feeling its too rich now (sooty plugs)

i have read that people "dial in" mixtures etc...i just wondered how they determine what it needs to go too

[stirlinggaz]

hi,
give us a clue then?
what bike? what exhaust? original airbox or open air filter? any other mods?
all those have to be taken into consideration when setting up carb'd bikes (as well as carb settings)
cheers,
GAZ

[lihp]

[Rogerborg]

Dynos are typically run at wide open throttle, right?
____________________
Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[lihp]

[mudcow007]

the bike is a 600 blandit (40k mileage)

original zort

original (genuine) air box/ filter

it just runs crap, on choke it will drop a cylinder, less choke, missing cylinder comes back - im putting this down to being too rich (plus the plugs are as black as a witches hat)

the bike is all tucked up for the winter now, so i wont fiddle with it until it gets warmer...

just thinking out loud really, i do like the look of them colour tune things though

[_Iain_]

[lihp]

[chris-red]

Mixture only controls the AFR at low throttle openings.

Where in the revs/throttle position does it run poor?

If it is missing and running crap with black plugs I reckon you need to look the electrical side of things, Plugs/coils/leads/caps etc.
____________________
Well, you know what they say. If you want to save the world, you have to push a few old ladies down the stairs.
Skudd:- Perhaps she just thinks you are a window licker and is being nice just in case she becomes another Jill Dando.
WANTED:- Fujinon (Fuji) M42 (Screw on) lenses, let me know if you have anything.

[Old Git Racing]

If its laid up for the winter whip the carbs off and clean them, jets out, pilot jets, emulsion tubes etc or get them cleaned. Check all the plug leads are good with good connections at each end, replace if in doubt same goes for plug caps. Fit new plugs of the correct grade. Clean or replace the air filter, check rubbers joining it to carbs. Fill with spanky new fuel and I bet it will run on standard settings.

OGR
____________________
2022 Tiger Sport 660 2019 Street Twin 2003 K3 gixxer 1000 1998 Srad 600 track hack

[Fizzer Thou]

I recollect a post a while ago where someone with a Bandit 600 had a similar problem and it ended up being the inlet manifold seals between the cylinder head and the manifolds.If they leak,which would explain your symptoms,then the bike would run lean.If the choke was then run on half setting,then this would compensate part way.

Easiest and quickest way to determine inlet leaks is to run the engine and then squirt some Dampstart or WD40 around the manifolds.If the engine revs change slightly,then the inlet vacuum is drawing in the accelerant and enrichening that cylinder.

If you are going to have the carbs off anyway,take a look at the seals

https://www.cmsnl.com/suzuki-gsf600-1996-sut_model13530/partslist/FIG2.html#results

Part #22
____________________
Just talk bikes.What else is there?

Always have a 'Plan B'

[mudcow007]

cheers all

fizzer, i think that was me earlier in the summer, so its already had the o-rings....

i will have another go at the weekend i reckon. no doubt i will get it running sweet but wont be able to ride it (no tax)


ta