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 The previous version was outdated and no longer supported.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

Husky 500 switch to Keihin pwk 41.5

M

Martint93

Husqvarna
AA Class
Hi, I have a Husky wr 500. I just rebuilt it with all bearing and seal replaced.
it was a cr500 engine, but I swapped to a wr 6 speed when I first had it opened.

I currently run the mikuni vm 38mm from my wr 400 and my wr 400 pipe fitted to the 500cc cylinder.

to the point, I want to try the keihin pwk 41.5 and see if it will make any performance gains.
I need some jetting advice. how do I know what needle and slide I need in this carburetor? I live at sea level in Norway, 0 - 25 celcius degrees. (32f - 77f ?)

still breaking it in..


excuse my bad English :)
 
I have gone to the pwk 39. Look at post 24 here I have found it accurate. http://www.cafehusky.com/threads/jetting.399/page-2#post-9731

The kx500 and honda cr500 used a pwk 39 at least towards the end of their run. I think even husky in the last xc 500 went down to a 38. However it might fit the rubber parts better. Most likely a keihin will be shorter, the husky 500 carb boot at the reeds seems a bit shorter than the 250/430 one for the 38 mm round slide which a pwk 38 or 39 go into with a bit of extra force. I am thinking wr 500 is the last of the dual shock and those carbs are generally longer than the mono shock.
 
I forgot to say it is an 87 mono shock liquid cooled. I just said it was a WR 500 because it has the 6 speed tranny and a sem ignition with lightning. it is also road legal! :)
can I still use the jetting you refered to?
 
If you get a 41.5 instead of a 39 I can't tell if or how those numbers should be adjusted. Or even if longer needles with different numbers are called for. I got a pwk 39 that had been set up by the seller (Sudco) for a 500 and I put on a 430 water cooled the way they set it up was virtually what those specs are. Not sure exactly what I have in it now but that DHG needle is close if not what is in there now. Not sea level but 200 to 300 meter above range shouldn't matter. I will copy and paste here I threw in a 45 pilot, 6.0 slide, DGH needle and 175 main jet. It's a little rich across the board, but that's a safe starting point, and should be a safe start on the 500, too. I have the 6 slide. Somewhere I seem to recall if an air stryker carb vs regular one effects the slide one number but won't guarantee that as right. I do have a custom pipe and silencer for what it is worth.

The starting lever doesn't seem to do as much on a big bike as the origional round slide micuni. Actually it seems to do more this year than I remembered. It certainly makes more difference pushing it in and pulling it out on a 200cc bike with essentially the same thing.
 
ok, but do you feel the 39mm pwk runs compared to the stock 38mm mik roundslide? the reason I wan't to switch carb is to get some performance gains or at least get it a bit more crispy.
I have ridden a couple of honda cr 500's, a kx 500, a yz490, ktm exc and sx 380 and they are so much different then the huskies I have. I think the husky is way easier to ride as it is smooth and tame down low, but since I'm mostly going to use this 500 on teh road, I want it a bit more snappy :)
 
I don't recomend it for the road. The chain gets oscilating, there is enough problems with the rear engine mounts as it is. At a mimimum some sort of coushioned rear hub should be devised the way I see things.

I can't tell you what difference to expect as the Micuni ones I replace have a heavy slide that has worn it's bore and often the threads for the idle adjuster give out hence new modern carb. It is either a keihin or a lectron on those cr hondas and kx 500 at the hillclimb races I enter on occasion.

In my opinion there really isn't enough room on a motorcycle for a pipe for a 500. I am not familiar with the yz490 but the others you mention the pipe has a loop back on one side then across and the rest and the silencer on the other side. The husky pipe never loops back and has a hard corner right away which can be smoothed a bit with a custom pipe but the others seem to have more room to come out straight without hitting the wheel. The husky also has metal rods holding the top end on where if the cylinder with a larger bolt circle attaching to the case and the head attached to the cylinder much more room and options are available for the ducts.

Maybe someone else can answer you better.

Fran
 
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