cleaned carb still runs bad

[skikman]

hi folks.a wee 125 im putting together.i have it more or less finished but cant get it to run 100%.it wont respond when giving it throttle[kinda stalls then goes].will cut out taking off at lights.wont idle right[up and down]when i blip the throttle it will die.sounds like carb problem right?i have had the carb apart now about 7-8 times.everything cleaned and blown out with compressed air.all settings look spot on.what the hell am i missing?any help would be great thanks.

[BIG_brother]

Its hard to say with out being there. Sounds like your main jet is stil clogged. Did you remove the entire jet and clean it? Or just the jet cap?

[Crage]

Did you replace all of the orings in the carbs? How does the spark plug look?

[tom203]

A "wee 125" what?? 4 stroke or 2? air filter in, exhaust on?

[Agemax]

A "wee 125" what?? 4 stroke or 2? air filter in, exhaust on?

is it a GS? is it a Suzuki?

[Maddevill]

If it cuts out abruptly when you give it throttle, your slide may be sticking or the diaphram may be torn. My son's F2 does this and every time one of the slides was stuck closed.

[BassCliff]

Greetings and Salutations!!

Hi Mr. skikman,

Read through all of this information. Most of it will apply to your bike in a general sort of way.

If you are here you probably have a 30 year old motorcycle that needs about 20 years worth of maintenance. You'll find all kinds of helpful tips, procedures, manuals, diagrams, "how-to" guides, etc, in the links below. Let's get started.

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Here is your very own magical, mystical, mythical, mind-expanding "mega-welcome". Please take notice of the "Top 10 Common Issues", "Top 15 Tips For GS Happiness", the Carb Cleanup Series, and the Stator Papers. All of these tasks must be addressed in order to have a safe, reliable machine. This is what NOT to do: Top 10 Newbie Mistakes. Now let me roll out the welcome mat for you...



Please Click Here For Your Mega-Welcome, chock full of tips, suggestions, links to vendors, and other information. Then feel free to visit my little BikeCliff website where I've been collecting the wisdom of this generous community. Don't forget, we like pictures! Not you, your bike!

More links to helpful threads in the forum:
Help! Your Bike Won't Start
DON'T DO THESE THINGS
Help! Your Bike Won't Run Well
Oh God! Pods!


Thanks for joining us. Keep us informed.

Thank you for your indulgence,

BassCliff

[skikman]

it is a suzuki gs 125 4 stroke.ive had the whole carb apart.all jets,seats,neddle,choke.its a cv carb.i didnt replace any of the o rings as they were ok.there is a good strong spark at the plug.maybe i'll take it apart again and soak everything[apart from rubber]over night.starting to think could it be electrical?but what?been doing my head in for weeks.have the wee bike together and lookin well.just this to sort out.o theres no air leaks and diaphram is sound.

[Agemax]

have you checked the valve clearances and/or done a compression check?
if not, do both. valves first

[hampshirehog]

Is it the original Suzuki (Mikuni) carb and not a Chinese copy? Those Chinese rip offs are poorly made and the original settings don't apply.

If it is original then it's more than likely a blockage in the pilot circuit.

[tom203]

Likely to have o-ring seal at carb boot to head interface- my honda single behaved badly till I replaced the 38 yearold o-ring.

[skikman]

pulling my hair out

ok update.have striped and soaked,cleaned and blown everything again.
the inlet manifold has a o ring.looks ok.put manifold back on with instant gasket for good luck.dont think its that because it has no cracks and in good condition.anyway i sprayed carb cleaner and wd40 around boots and manifold with bike going and no difference to idle.
valve clearance ok,slightly loose if any.
dont have a compression tester but blows my finger if you know what i mean.
the carb is a mikuni.
the only thing i noticed is that the spark at the plug is more bright yellow than blue but is good and strong looking.im missing something but what

[hampshirehog]

Are you using the standard air filter?

[skikman]

Are you using the standard air filter?

yes standard and i cleaned and oiled it.also tried it without it.

[skikman]

not carb

right.i bought another used carb of ebay.put it on and its doing the same.will idle ok for a wee minute then rise up to 5000 on its own.bliping the throttle will bring it back sometimes,bring it back to low and cut out.or not bring it back. it seems to be worse when engine is warm.boots have been checked and rechecked and have been spraying wd40 around while bike is running.at my wits end