• 2 Stroke Husqvarna Motorcycles Made In Italy - About 1989 to 2014
     WR = 2st Enduro & CR = 2st Cross

  • 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.

    When he passed, I worked with his kids to gather the necessary credentials to keep this site running. Since then (and for however long they worked with Coffee), Woodschick and Dirtdame have been maintaining the site and covering the costs. Without their hard work and financial support, CafeHusky would have been lost.

    Over the past couple of weeks, I’ve been working to migrate the site to a free cloud compute instance so that Woodschick and Dirtdame no longer have to fund it. At the same time, I’ve updated the site to a current version of XenForo (the discussion software it runs on). The previous version was outdated and no longer supported.

    Unfortunately, the new software version doesn’t support importing the old site’s styles, so for now, you’ll see the XenForo default style. This may change over time.

    Coffee didn’t document the work he did on the site, so I’ve been digging through the old setup to understand how everything was running. There may still be things I’ve missed. One known issue is that email functionality is not yet working on the new site, but I hope to resolve this over time.

    Thanks for your patience and support!

250-500cc Dumb air screw question

Jhunter

Jhunter

Husqvarna
AA Class
Due to summer heat and humidity in Atlanta, my bike is running a little rich ('08 WR250). I'm thinking a half turn on the air screw may do it. So here's the dumb question. If I turn the screw clock wise, am I going leaner or richer?
Mikuniairscrew.jpg
 
not a dumb question... in is richer, out is leaner :thumbsup:

EDIT: just to point out, the air screw is not visible in your pic. that center Philips w/locknut is the idle screw. the air screw is just behind the fuel hose in this pic.

and some tips in case it helps:

Warm engine completely

Turn the air screw all the way in, then turn it out 1.5 turns to start. Start the engine, and turn the idle screw in until you get a slightly fast idle, or hold the throttle just barely cracked, to keep the engine idleing. Turn the airscrew slowly in, and then out, until you find the point where the idle is fastest. Stop there. Do not open the screw any farther, or your throttle response will be flat and mushy, and the bike may even bog. This is only the starting point, we will still have to tune the air screw for the best response.

Time to tune the air screw for the best throttle response. Again, make sure the bike is at full operating temperature. Set the idle back down (the bike should still idle, despite what you read in the Moto Tabloids), and ride the bike, using closed-to-1/4 throttle transitions. Turn the air screw slightly in either direction until you find the point that gives you the best response when cracking the throttle open. Most bikes are sensitive to changes as small as 1/8 of a turn.

The air screw is not a set-it-and-leave-it adjustment. You have to constantly re-adjust the air screw to compensate for changing outdoor temps and humidity. An air screw setting that is perfect in the cool morning air will likely be too rich in the heat of the mid-day.
Click to expand...
 
Typeone - I had a 'senior moment' on the idle adjustment screw... So, just behind that tucked up tight is the brass air screw. Good notes above. I'll make some small adjustments until I get it figured out. The jetting is great and I really have no complaints about the carb so let see if this works for the summer temps. Thanks!
AirScrew-Actual.jpg
 
no sweat :)

i'm sure you know, but the Stealth Racing idle screw and ZipTy air screw make these quick adjustments sooooo much easier. nice upgrades.
 
Every time I post, I find some new little 'tip or trick'. That spring loaded idle screw is perfect. I think I'll order of of those this week... Thanks Dirtdame.
 
A half turn 'open' on the air screw made a huge difference. Once the temps drop and the humidity goes back down, I'll richen it up a little...
 
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