• 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.

    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 The previous version was outdated and no longer supported.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!

Installing the ufo's

Bigbill

Bigbill

Husqvarna
Pro Class
Finally started installing the UFO's in my round slide mikuni carbs 44mm through 38mm. One note for my post I drill a hole through the UFO mounting screw and tap it 3mm x .05. I don't use the self tapping screw it comes with. I could use the self tapping screw but it's my preference to tap it and use the flat head metric screw. I doing my cr500/xc500 44mm carbs first.

www.boltdepot.com for screws
www.amazon.com for the tap and drill.
 
It improves the overall throttle response, the flow of gas into the reed cage. That wall in the rear of the throttle sleeve blocks the gas flow and sends it into the incoming flow. Pics soon.

http://thunderproducts.com/shop/u-f-o-ultimate-flow-optimizer/

I'm planning on installing one in every round slide mikuni carb. They also make the UFO for other brands of carbs.

This is snowmobile technology that works in any round slide carb.

Where you live the jetting may differ. But you must go smaller on the pilot due to the increase in gas flow. Give your old vintage gal the edge in performance. Every little bit adds up. It's 1 hp gain per 100 cc's that's 5 hp for a 500cc bike. New boyzeen reeds, add the ufo, spacer under the reed cage, Brappppp.
 
5hp on a 500?
i have no doubt they help on a mikuni, with that huge hollow spot underneath a vm slide. some carbs dont need a spacer as the slide is designed to not need it..
lectron_rear.gif

taper bored
Slide_Assembly_5566.jpg

notice the above slide is upside down, the bottom is clean with no disturbance.
 
It says the 3.5 cut away piece in included. Once you rejet it's awesome.

I installed a 40mm carb on a 390cr. I installed the UFO, the leaner needle jet, and rejeted it. She ran awesome. But lots of power.
 
no jets....they do recommend going to a half the size you been running pilot and also use of a 3.5 slide regardless what you have in.
 
Example, my ported, 81 cr250 husky with the UFO if I remember correctly the pilot jet was a 30 or 35. It depends where you live and your mix ratio.
 
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