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 The previous version was outdated and no longer supported.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

430 LC V Force and manifold

If you add the vee force reeds, and keep the round slide I suggesting adding the UFO to the bottom of the round slide. It's like adding a ramp for better fuel flow. The bottom of the round slide has protruding edges that act like dams abrupting the flow of gasses. You need to rejet. But once it's rejected its throttle response is so much crisper and cleaner. Add this vee force reed set up, a little porting, the UFO and your 250 isn't a 250 anymore. I've tried everything but the vee force reeds. The 250cc can be a sick bike to ride with a little work.
My '81 cr250 was a sick ride. The engine was ported and I added a reed spacer plus the UFO. The engine was so responsive it like knew your were going to rev it up before you wicked it. It was right there throttle wise with no hesitation.
 
Bigbill said:
If you add the vee force reeds, and keep the round slide I suggesting adding the UFO to the bottom of the round slide. It's like adding a ramp for better fuel flow. The bottom of the round slide has protruding edges that act like dams abrupting the flow of gasses. You need to rejet. But once it's rejected its throttle response is so much crisper and cleaner. Add this vee force reed set up, a little porting, the UFO and your 250 isn't a 250 anymore. I've tried everything but the vee force reeds. The 250cc can be a sick bike to ride with a little work.
My '81 cr250 was a sick ride. The engine was ported and I added a reed spacer plus the UFO. The engine was so responsive it like knew your were going to rev it up before you wicked it. It was right there throttle wise with no hesitation.
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UFO? what's that?

i was thinking lectron but haven't researched it yet!
 
It's a plastic wedge that's tapered that fills up the bottom of the round slide. The uneven bottom of the round slide allows or makes the flow of gas uneven. I believe the UTO's were first used in snowmobile technology. On the round slide carbs the throttle is more crisp. With good reeds it's even better. Add porting and it's an animal.
Nothing beat my '81 cr250 husqvarna down the straights nor even in a side by side drag race. The throttle response is right there.

It's a learning curve because we need to factor in the stopping power to the new found power. Factor in safety. Push it a little at a time to get use to it.

The UFO cleans up the throttle response as the round slide is raised. The confusion in the gas flow at this time is gone. I actually file and sand the ufo once it's installed to be flush with the bottom of the slide. I also may taper it even more so the gas flow is ramped better and smoother into the reeds. The angle can be adjusted even smoother.

Sorry it's no lectron but it makes the round slide carb run better.

Search for,,, UFO carb insert

Read all the info on it to see if it's for you it does require rejetting.
 
the inserts for roundslides have mostly proven to be good items..it depends how much money you want to invest, really..
 
justintendo said:
the inserts for roundslides have mostly proven to be good items..it depends how much money you want to invest, really..
Click to expand...

I remember dropping the pilot and main jets smaller. There is less gas needed. I think the UFO makes better use of the gas flow. Thus it's rich without rejetting.

It's no lectron carb for under $40 but it is a improvement with the round slide carb.
 
Bigbill said:
I remember dropping the pilot and main jets smaller. There is less gas needed. I think the UFO makes better use of the gas flow. Thus it's rich without rejetting.

It's no lectron carb for under $40 but it is a improvement with the round slide carb.
Click to expand...


Thanks I'll check it out
 
The UFO inserts work well. They need leaner jetting because they increase the vacuum signal the carb "sees". The flow is increased but the vacuum signal is also so you dont richen the jetting, you lean it.
 
When I installed a mikuni 40mm round slide carb on my 80 390cr with the UFO I leaned the needle jet and went smaller on the jets. This was a sick bike to ride. It wasn't for a beginner. I think using the UFO makes it easier to jet.


It's way to rich without rejetting. You have to lean it.
 
Now you have to ask yourself why didn't I think of the UFO?

A little tweeking with a few performance upgrades these old husqvarnas can really fly with a good pilot.

Years ago I built drag race engines, porting, adding trick parts that increases the horsepower and the main thing was I'm good at tuning. Then I got involved with speed cutting with stock chainsaws at the local fairs. I learned the two stroke porting from the husky rep from one of his old 100cc cylinders. He widened the ports but changed the port timing. The saw was a animal. I applied the porting I learned to my 81 250cr husqvarna and my son's 85 125cr Honda. I added the roost boost to the Honda. The 125 Honda would eat 250's my buddies didn't understand why. The 125 turns faster lap times than 250's in motocross. The 125 revs higher than a 250. Give it some more spunk in the trunk with some porting then upgrade the ignition of that time equals a good running bike.
 
silverstreakNZ said:
the only hit on google for that part number is this thread
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Huskydoggg Steve had exclusive rights to be the only dealer for them in North America, so maybe he put on his own part numbers.
I got the set up from Steve before he was selling them to try and help him out with more feedback on how well they worked.


IMG_7420.JPGIMG_7616.JPG
 
Andy @ HVA-Factory has that im starting with the UFO thing y and torque wing gizmo in the stock VM and Boyense reeds and see how that works
 
I've just added a V forces and hva manifold to an 84 Cr250 but at the same time cleaned the porting up, added Electrex ignition and modified the Answer silencer (removed the spark arrestor)

The bike feels completely different now. Pulling long n hard.

I really want to try one as a straight bolt on though with no other mods. So you can really get a feel for any improvements.
 
As it so happens I just installed the V-3 on my 84 250 yesterday. I got mine from Huskydogg but as said recently else were here on the forum He has closed shop. A great loss for all Vintage Husqvarna restorers . Anyway the V3 is sandwiched between the stock Intake and the Cylinder. The Intake on the 84 has some "Wings" that protrude into the Reed that need to be cut off. The stock Intake makes a transition from the round Carb to an Oval with Wings that fit into the Reed. The V3 has a Square shaped Intake Port with sharp edges. The Oval is larger than the Square. So there is a pretty good miss match where the two meet. I took a Die Grinder and Ovaled the Square shaped V3 to make it look like it should work better. However between to Carb and the V3 the Intake track widens out then narrows back up as it enters the V3. I think this is wrong, the flow threw the Carb has the Venturi effect then it slows down with an opposite Venturi effect then rushes into the V3 creating the Venturi effect again. One would think this could allow Fuel droplets to fall out of the Air Stream, forming a puddle right in front of the V3. One thing I do know about Air Flow is that what looks like it should work best probably doesn't. And what doesn't look like it should work might. The Cars of the 50's and 60's look like the most aerodynamic of all and yet they prove to be some of the worst. I have also installed one of these on a Maico of the same Year, with the same concerns, and it works alright. Another concern of mine is that the V3 was designed long after the Open Class 2 stroke was extinct. And there fore was primarily designed for 250cc Engines. I don't see a Part Number anywhere, but getting one to fit the Husqvarna Cylinder Bolt pattern shouldn't be that hard to come by.
 
darren, is that the older style machined ignition cover andy has? it looks odd..either way nice upgrade over stock. im going to have to order one of these intakes next time i order from andy
 
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