• 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 The previous version was outdated and no longer supported.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!

125-200cc carb question

Last Lap

Last Lap

Husqvarna
A Class
The book that came with the 144 is useless. The screw on the left side of the carb is that the idle screw? It seems two be out more than a turn and a half. I started the bike for the first time tonight and I have to keep the choke pulled up slightly to keep it running. I did not want to throttle it up. I just wanted to warm it until warm and the shut it off.

Thanks,
Jeff
 
2T Carb Basics:

The idle screw on the Mikuni is a silver screw with lock nut (stupid design in my opinion). It's located on left side towards the middle of carb. Loosen the lock nut, then turn the screw inwards to lift the throttle slide (and increasing the idle speed). Outward on the screw, lowers the slide and decreases the idle speed. Tighten the locknut when finished.

The air screw is located closer to the airbox boot. To lean out the fuel mixture, turn the air screw outwards (adds more air). The richen the fuel fixture, turn the air screw inwards (decreases air). The correct size pilot jet will typically have the air screw about 1.5 to 2 turns out from fully seated.

Here is a pic of my previous Mikuni TMX. NOTE: I installed a Stealth Racing idle screw (large silver knob) and Zip-Ty air screw (blue color knob). Both cost about $20 each and well worth their money.

image0002-1.jpg
 
The only way this bike will run is if the air screw is a quarter out from seated. Any farther out and it bogs and will shutoff.
 
Last Lap;109767 said:
The only way this bike will run is if the air screw is a quarter out from seated. Any farther out and it bogs and will shutoff.
Click to expand...

That would indicate that the carb wants a richer mixture for the pilot circuit. I would swap the pilot jet for one step larger size to let more fuel in (richen the mixture). This should allow you to then set the air screw further outward (such as 1 turn) to balance the air:fuel mixture again. This would provide you some room to fine tune the screw day-to-day.
 
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