All 2st Jetting Chat - Need Help? Post Your Questions Here

I do not get the jetting 100% maybe someone could help.

Wr250 2009 (riding sealevel)
Mikuni new type
Fmf gnarly
Mix 1:30
JD jetting kit
Red needle 4 position
420 main
32.5 pilot
Aircrew 1 turn out.

The problem is wenn I go off throttle or a little less it's to lean.
Riding 60kmh in 5 gear it's almost blubbering with 2mm throttle but riding 80km with a little more throttle it's getting to lean.
Also when deep havy sand full throttle it's al ok but then I go a little off throttle to 5% it's again verry lean.
What could I do?
I ordered the htm racing head and inletspacers how will this effects the jetting?

Best regards
Marco

Read this

http://www.iwt.com.au/mikunicarb.htm

Thanks I will try to 35 pilot jet and raise the needle to 5

Make only one change at a time, if it helps it run better keep going in that direction. If the change makes it worse then obviously go back in the other direction. Remember it can be lean in one circuit and rich in another so pay attention to throttle position. You will learn the feeling of rich and lean as you get experience. The basics are the same for all carburetors only the circuits might vary a slight amount. A Lectron is probably the easiest since a needle/metering rod adjustment does 80% of the fuel regulation and the only overlapping circuit is the powerjet for approximately 7/8 to wide open

I will first install the racing head black edition from HTM :-) otherwise do i have to start over again.
Did anyone played with ignition timing? A little earlier or later?
Maybe i will do some dyno testing at our company we made a tool/adjustemt to messure bikes at our Dyno for cars
Does anyone messered lambda by a two stroke? at a dyno?

Hello guys, I've got a problem with my 2010 Husky WR 144 (Mikuni Tmx 38 carb) . The bike keeps sputtering in the higher rpms, no matter what main jet I'm running. In winter I usually ride a 480 main jet. I tried out the jets all down to 450, but the problem stayed exactly the same. I've also installed a new airfilter, cleaned the whole carburator and installed a new spark plug. Has anyone got an idea what the problem could be? I'm thankful for every help. And you may excuse my english because I'm german..

Check spark plug wire and coil for spark burning away the center or arcing. Also remove coil and clean the ground and also check the wiring to the coil and stator for wires worn and exposing the copper to ground. You can also ohm the stator and the coil while you have it all unplugged.

I have Husqvarna SM125, model 2005. I have fitted 5-port CR125 -09 cylinder, older TMX38 carb, Dep pipe, BUD Racing cylinder head, V-Force 3 on it. Does anybody have any idea for good jetting for this carb?

Start with a 470/480 main jet and work your way down till ist perfect.
i had a 40leak jet and went to a 50 which is far better- but i live on sea level- so that will be different based on where you live!
Also i would make sure you have 2 holes on the exhaust side of your piston drilled into the skirt to lube the exhaust bridge.
If not- its more than likely you will seize your engine.

Any thoughts? Looks lean to me.

A huge carb question
Hi all
Here what’s a deal – I was riding cpi sx 50, the specific is – it has max torque at max rpm, no power valve, no low rpm traction, so to make it ride I have to go wide throttle open. That is the reason I tune carb to make it run perfect at 100% open throttle.
Now I bought husky, and don’t understand for now how to tune carb. Can it run perfect at all throttle range? Should I do some tune in order to my riding style? What is the basics for tune it?

mb someone can point, where i can get info like that?!

comprehensive article here
http://www.kdxrider.net/forums/viewtopic.php?t=1156

125cc+tuning pipe
34mm carb - from what size jets to start?

Anyone advise how to remove the needle jet - needle nozzle ?
ie thing that needle sits in

Which carb?
If I recall correctly, mikuni tmx push out from the float camber up through the slide chamber. You need to remove the main jet then the larger nut (10mm??) above the main jet.
Keihin pwk I understand are not serviceable or removable, but am prepared to accept I may be wrong.

BE GENTLE

Mikuni TMX

hello to a big community
i tuning chinese 34mm carb (PWK copy) on my 125cc husky, for now it's 50 pilot and 175 main, needle - second clip from top. Spark pretty lean. And have this problem - stalls after dropping trottle. And have some hitch opening throttle from idle. Middle range and full throttle goes perfect



please help

I need help determining what jetting would be best for subtropical (temp range between 15 to 40 degrees Celsius) near sea (humidity range between 30% to 80%) and a less then 50m elevation from sea level ?

Anyone got the part number on the rm needle for cr125?