WR 250 ,1980

Trying to sort out jetting what are the standard spec's I'm in Queensland ,Australia

Maybe you should ask dukkman52, he is also in Qld at your approximate altitude, has lots of knowledge and quite a few Husqvarnas.

Thanks AJCMBROWN. I bought a new carby but the jetting they gave me got mixed up with all the rest of my spare mikuni jets . The needle and needle valve jet is with about 10 others in a box. Lucky dip finding the right ones. I'm waiting to here back from the carby guy as well.

check the tech reference section here

Standard should be around 45 pilot, 430 main second clip in the needle.

Before jetting make sure the air filter is clean, carb float lever is set right.
No air leaks on the cylinder base and ignition seal and carb boot.

Put the needle in the third slot. Make sure the spark plug is ok. Make sure there is a tad loose feeling in the throttle cable housing. Lube the throttle cable.

First using a hand held tach adjust the balance screw for the best idle. The balance screw should be between 1 to 1 1/2 turns open. Change jets till this is achieved. Remember to adjust the idle as you go.

How does the throttle feel? Lean or rich. if not sure go rich till it's blubbery. Then back off till it's crisp on the response.

Now how does it feel off the bottom? Rich or lean? Does it respond of hesitate? Put the needle from the third to the fourth slot. Is it too rich?
If it's close open your balance screw a tad. Or is it lean then close your balance screw to richen it.

You will achieve about 90% of having it jetted close the last 10% is tough to get out.

Thanks BIGBILL.

always listen for the "clunk" when let the throttle off before starting the first time.

All good sorted ,thanks everyone!