Carburetter experts required!!!

[tshort2007]

Afternoon all. Having some MAJOR issues still with poor idleing, to the point where the slide is adjusted around 1/3 up jut to idle at 1400 RPM. Acceleration is sluggish, and plugs foul every 800 miles. I have tried all kinds of adjustments on the float height, with no difference. The carb is factory set with the idle air screw, as the casting is blanked where the screw goes. After i eventualy get the bike started, after a run, if i take the carb off, there is fuel al inside the spigot joint to the engine. If i pull even slightly on the choke when idleing, the engine cuts out, which i belive indicates a ric circuit, along with the black, wet sooty plug.

I am stuck for ideas, and cant really afford to get a pro to look at it. Anybody got any suggestions?

Cheers all
Tom

[Alex_H]

Your right, sounds rich. Make sure the air filter isnt all gunked up - did you do anything to the bike before it started doing this? What bike is it?
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1998 r1, ccm 644 ds, 2000 r6 ghetto track bike

[P.addy]

hey..
my bike cold idles @ 1400, warm runs at 1750
its what my manual says, but i guess its different per bike.
Have you got any performance parts on there, 3rd party air filters, holes in ur airbox? jetted your carb?
i know thats what made me worry about popping and backfiring.. but again..could be my bike.

[tshort2007]

The bike is stock, apart frm a micron exhaust system, jetted from 100 to 105 to suit (still a little under, needs a 110) Bike currently runs with NO filter, as it just wont run at all with a filter on. My cousin has same bike, and his carb idles perfectly on my bike.

[Blue_SV650S]

Dude, is the main jet still 'in'?

Also take out the emulsion tube (the bit the main jet screws into) and check all the little holes are clear.

Also have you checked the needle jet is secure?

https://cv-performance.com/images/uploads/vortex_tube.jpg
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The purpose of life is to fight maturity.

[tshort2007]

[tshort2007]

kawak ar125, 2t, single cylinder, rotary valve, mikuni vm 24 carb, cdi ignition.

[kungfupoodle]

Rich makes the plug sooty certainly.. but if its wet it could be an ignition problem.

Has the ignition timing slipped? Check it with a strobe at whatever rpm the service manual says to do it at.

[Blue_SV650S]

[tshort2007]

Clear as the sky today! Am i right in saying the tickover does not use any part of the needle? and if i am coct (please correct if i am wrong) but there is insufficiant air pressure to draw fuel through the needle at idle?
OR
Because my idle circuit is so rich, having the slide 1/3 up just to tickover gives the air pressure required, giving a perfect mix from the needle jet but richening it from the rich idle circuit?

Could xcess fuel leak through the needle at idle speed?

Thanks for your help so far!

[Blue_SV650S]

[tshort2007]

[Blue_SV650S]

[tshort2007]

have blown through the 2 holes in the front of the carb on the air intake side, and both blow through into the emultion tube. by the holes in the bottom of the crb, i assume you mean the holes to the side of the top of the emustion tube, therse are also clear. how many holes are there inside the emulion tube (the casting, not the brass) from the air intake side?

i think poking with bristles from a brusare in order!!!

PS, will pop pics on later today, bike is at work at the moment. Bloody shame its runnin crap, as its a pefect biking day today

[tshort2007]

images below ( i hope )

[tshort2007]

UPDATE - STILL NO JOY

Stripped the carb compleatly, scubbed all the crevicis wih cotton wool and carb cleaner. rebuilt, and nothin

I have shown below a mod to the above image showing my idle circuit. the main feed in comes direct from the air jet in the intake of the carb. i assume it atomises as the emultion tube, so why is it still putting too much fuel in?

AAAAAAARRRRRRRRRRRGGGGGGGGGGGHHHHHHHHH

[garyd]

Use your mates carb and ride the bike,if its now ok stop messing about and get a new carb.Then play about with that old one at your leisure
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CRF230 all you need

[tshort2007]

Read my above post - funds are VERY low!! mates carb works fine, had it on for 3 days, cold starts, hot starts, wet starts, all fine!

SO i know its a carb issue, and cant afford the 110 for a new one

[tshort2007]

More of an update

Blocked off choke
lowered float height below the standard setup (not as much fuel in the bowl)
unscrewed piolet jet 1/4 turn

Idles slightly better, at 1300 RPM with just the idle screw all the way in. No extra tension on the cable needed

So, lowered float height a little more, no further difference
then
unscrewed jet a littlemore, no differene

[baldy]

You should replace the broken jet. It may be letting a lot more fuel in than you think.

Does the needle valve work properly? It may be flooding the carb.

[tshort2007]

is it possible to block the needle jet off tempory to see if fuel is leaking through the top of the emultion tube? and is there a way to block off the idle jet slightly (by blocking one of the 8 holes in the side) to see if this betters things?

Thanks guys, your advice is invaluable so far

[Blue_SV650S]

[tshort2007]

[tshort2007]

WERE GETTING SOMEWHERE!!!!!!!!!!!!!

Plugged up the main jet, to prevent the fuel getting into the emultion tube. Idling at 1600 RPM with just the slide adjust screw about 2 turns out . but the bike revs up to red line when i twist the throttle.

gonna go an have another fiddle!

[Blue_SV650S]