• Husqvarna Motorcycles Made In Sweden - About 1988 and older

  • Hi everyone,

    As you all know, Coffee (Dean) passed away a couple of years ago. I am Dean's ex-wife's husband and happen to have spent my career in tech. Over the years, I occasionally helped Dean with various tech issues.

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Carb tunning advice

86 400 XC

86 400 XC

Husqvarna
Pro Class
I have a some what good working 38 mm flat slide Mikuni From an 85 CR 250 on my 86 400 XC.

The XC works well a 38 round Mikuni, main jet 390.
The flat side has a 360, so i went to the 390 jet hoping it would get me closer tune wise.

The bike starts great and so on, ride around its a nice feel on the low end and good mid and all around until I try to ring it out full throttle.
It will pull hard with my other carb and tried the 360 main but was the same and I only had a 420 to try the way and that was lame too. Willing to buy a few other jets. What would get this carb going right.

Grab a 380 and 400 jet? Or what should i be looking at, to get this sorted out. Kind of a EFI guy here. :(


 
Sounds like the needle jet is too lean.TMX carbs dont have a changeable needle jet though.Change the needle?
 
Well only cost me $35 to buy and they have a crisper response on other bikes.

Got some main jets comings and see if i can get it to pull up top good.

I know lean is mean, i will go to a richer jet when i have it making good power to be safe.
 
Pulls real hard with the 400 jet, time to try the 410 and drop the clip and keep it on the rich side.
 
im up to 430 main on my 400 and its just starting to feel a bit doughy on top. im lean on the needle but its very smooth to ride and i can get through it ok
 
410 feels better, will try the 420 now.
I'm around 4000 feet here in good air now fall and spring, and then goes up to 6000 mid summer when i was checking the air for racing cars and jetting.
 
For main jets, I prefer to go to what I call "stupid rich" and work back down. Start rich enough that the bike blubbers on wide open throttle, and test and test as you work down until you just find the jet that lets it rev out clean. Usually, just a step or two leaner (still carefully testing) and you will get the top end rev that you want, and the bike will have enough jet to keep itself alive.
 
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