WR 500 / 1984 carb-jetting Mikuni VM 40

Hello husky drivers

I have a WR 500 ´84 with Mikuni VM 40 , can someone tell me which is the best jetting ? The engine is new restored.

regards Thomas

It depends on where you live and your mix ratio. First do you have any experience in jetting?

Make sure your float lever is set correctly.
Make sure the air cleaner is clean and lubed.
Check the rubber boots for cracks replace when necessary.
Set the needle in the third clip.
Second make sure your needle and seat isn't leaking(when the bike is off with the fuel on, flooding)
When your pilot jet is correct the balance screw should be between 1/2 to 1 1/2 turns from bottom.
Lower the idle screw as you go.
With your main jet I'd go rich till blurry then back off smaller till it cleans up.
Then adjust your needle up then down till the throttle feels smooth.
Last adjust your balance screw to tweek it in.
If it's still rich 1/3 rd of the way and up you may need a leaner needle jet. That's the verticle tube in the carb body that holds the main jet.

Sometimes going through this jetting process may take two or more times to get it right. Depending on how far it's off.

Thank you

Hi Tom
Is your speedo a ktm one ?
How did you manage the connection to speedo and to the hub wheel ?

On my 500 ae 84 with the 40 carb:
2.5 cut for .... ?
needle 7 DH3
Jet 390
needle jet 224 AAO
idle jet 65

Hi Michel

thanks for carb-jetting data

this is a speedo 60 mm Maico / KTM (21 inch wheel) , spedo-cable is a KTM you can buy by the KTM Klassiker Andre Horvath Austria
http://www.enduroklassiker.at/de/se...370mm.html?search_query=tachowelle&results=64

suspension reservoir attachment / rubber , I have buy here in the car offroad-shop

http://www.ore-shop.de/wartung.php

a long pipe clamp and a turbocharger alloy pipe 60 mm on ebay

very nice, looks pretty good

nice work, very talented.

My hva speedo plug into the wheel !
Is your ktm plug the same ?
On the speedo is it 12 mm x 1.00 ?