carburator tuning...

[justbecausegtr]

so i spend about an hour adjust my carburator..and i close it which it will not start no matter how many time..if i open it up a bit ...it will start but rought but if i open it a bit more , problbaly 7 turn from closing to open , it start right up but it will not run right...so what gift... not runing right it like it struggle to switch into newer gears..then it shifted into higher gears... auto centifugal clutch actually,,

 

[jandj]

I tried processing all that, and after careful consideration all I got was a headache.

 

[mckutzy]

....

Howabout you tell us what carb/motor/"trans"/kart you are using. That way we'll be able to help better.

 

[justbecausegtr]

im so so so sorry.... lol the motor is kt100 from superdyne racing... carb is prob yamaha carburator.. trans is auto...and clutch is centrifugal clutch..... what is the problem is that...if i close it by turning clockwise then it wont start... and if i loosen it a bit ( aka counter clockwise )it start but rought and just shut off....and if i turn it couple more turn ( counter clockwise as open it up ) it start and idle but it wouldnt just idle , it kinda just searching up and down and up and down , so mind that..so i hop on and test drove it.. it drive really good but it seems like when i go fast , it seems to be stuttering ( just a bit ) then it will shifted into higher gears. if i then adjusted again by closing the carburator ( turning clockwise to close ) it will idle hight and my clutch seems to shifted it self into higher gears while standing still , but when j drove it ..it seems to have no stuttering problem.before it shifted into higher gear like before...

 

[Zombient]

I'm drawing.... a blank here.... Wish I could... help...

 

[justbecausegtr]

can the carburator idle... and not turn off if i dont take off right away

---------- Post added at 02:34 AM ---------- Previous post was at 02:30 AM ----------

ok..what happen if i use the liittle stick thing.. and turn clock wise on the carburator.. and what happen if i open the carburator....and what is the disadvantage.

---------- Post added at 02:37 AM ---------- Previous post was at 02:34 AM ----------


Clockwise to reduce gas flow and counterclockwise to allow more gas follow. This problem often occurs because your carburetor is flooding.

The brass color screw located below on the side of the carburetor, next to the choke lever is for the fuel and air mixture. Start by turning this screw (clockwise) until it stops. Don't turn it in tight, just until it stops. Next, turn the screw out two full turns (counter-clockwise). This is the factory setting. You should be able to start and operate the Go Kart with this setting. Once you have it running, you can adjust it. Never turn the screw more than 1/8 of a turn at a time. Turning it in too much will cause the motor to run lean at full speed and may burn a piston. Also, running too lean will cause a loss of low end power. Once you get the mixture set you can adjust the idle, it should be low enough that the engine doesn't vibrate. Finally make sure you have the choke lever down completely after the Go Kart is started and warmed up.

---------- Post added at 02:43 AM ---------- Previous post was at 02:37 AM ----------

cause if i turn too much the motor will bog out..and wont idle therefore it flooded with gas... if i close it it will be too lean ... and as far as i know...the stuttering to get to higher gears = higher speed i get that stuttering then it will be in higher gears which resolve in going faster... so i am assuming that i lack of low end power... so therfore what is the perfect setting for the yamaka kt100

 

[J_Walker]

Remove sparkplug. upload a picture here... pls.

 

[landuse]

This is also giving me a headache. Post some pics of everything

 

[justbecausegtr]

i change the spark plug .....so that one is new...... if i would want to switch aparkplug.. which apart plug i should run..

 

[Poboy kartman]

i change the spark plug .....so that one is new...... if i would want to switch aparkplug.. which apart plug i should run..

He's saying take pictures without the spark plug....take some good pictures of the carb....we don't have to translate pictures from Vietnamese broken English and it makes it easier to figure out without a headache.

 

[Half-breeder]

Sounds like he's talking about the fuel/air mixture screw... also sounds like running lean.

 

[justbecausegtr]

yes sir fuel air mix..will take picture of the spark plug soon

 

[J_Walker]

Thanks justbecausegtr. The spark plug will give us a good indication of what's going on with your carb.

And if you feel like you need to explain something easier, we can all use google translate. if you need to just type it out in vietnamese we can translate, it might be easier for some of us to understand that way.

So far from what I've gathered is you have been touching the Air/Fuel mixture screw, and the Idle screw.

If you can tell us what carb it is? Is it the original OEM one to the KT100 engine? or has it been replaced for another.

if its original here's a good post from here that may help you. Same engine.

http://www.diygokarts.com/vb/showthread.php?t=17429

 

[justbecausegtr]

thank j walker... i really appriciated you trying to help..but i speak 3 languages so sometime it hard for me to say certain points and tried to make it make sense you know..

yes i have been touching the air/fuel mixture screw..and there is also another smaller handle right next to the air fuel mixture screw but i didnt touch it as i dont know what it is.


the carb seems to be the yamaha stock carburature.....wb3a one.. but i will also take picture of it for you guys , the engine does have a logo of "super dyne" on the side

also the motor spit out oils in the back...

 

[kheper]

There are 3 adjustments on the Walbro WB-3A: the highend needle, the lowend needle and the idle stop. Which one are you turning?

 

[justbecausegtr]

my carb look like the one beloe..and according to your picture... i touched the high needle... and i didnt touch the low or the idle stop watever ..
see the picture below...i touch the high needle ( t looking )

 

[kheper]

https://www.pegasusautoracing.com/document.asp?DocID=TECH00038

"From the fully closed (bottomed out) position, adjust each needle to your baseline setting, or 1/8 turn on the high speed needle and 1 full turn on the low speed needle."

Close the highend needle - fully, then back off 1/8 of a turn. Close the lowend needle - fully, then back off 1 full turn. If the engine does not start, you may need to rebuild the carb OR the problem with it lies elsewhere.

 

[Poboy kartman]

That's what I thought.....NO....one needle ain't getting her done....(one high speed, one low....(jets)....one more to adjust idle speed via throttle plate position....)

THAT'S WHY WE COULD HAVE HELPED MUCH QUICKER WITH PICS!

 

[justbecausegtr]

kheper.. where do i start....

start with tbe close high end needle... right..?

---------- Post added at 05:26 PM ---------- Previous post was at 05:23 PM ----------

i was reading somewhere..and poeple said try to stock setting.. which not touching the low ned needle...but close the high end needle.. then open it back up two turn and it would start and idle.... ..and what do you know.....i did that and the kart start up and idle spot on...and pretty responsive on the gas pedal also... but i will try the kheper ways..and see what going on..

 

[kheper]

Before starting the engine, adjust both the highend and the lowend needles. 1/8 turn for the highend and 1 turn for the lowend are the stock settings.