• 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 The previous version was outdated and no longer supported.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 jetting specs

cntymnty

cntymnty

Husqvarna
AA Class
I have the original jetting specs for my 78 390 as part of the original Husky Manuel. Does anybody know if Husky published those jetting specs to be used at sea level?
 
cntymnty said:
I have the original jetting specs for my 78 390 as part of the original Husky Manuel. Does anybody know if Husky published those jetting specs to be used at sea level?
Click to expand...


Yes, the factory jetting specs are for sea level. Also the fuel mix at 4%.

Marty
 
Hoping to piggyback on this thread a little. I'm taking the Bing off of my 77 250WR and putting a Mikuni 38 on. What jetting and how many turns out on the air screw would you recommend for a base line? I'm thinking I could go off what my 1981 manual says for a 250 which is a 430 main jet and and a 45 pilot jet (I have a 47.5 pilot in there now because it's what I had)? I I live only a few feet above sea level.
 
Did your 77 come from the factory with a Mikuni? I'm not sure what year they changed. If it did, there is some place you should be able to look up the stock specs. My 78 390 specs are 430 main, 45 pilot, 6DH3 needle, a 166 series Q-8 needle jet and air screw out 1.5 turns. Marty sez those specs are at sea level riding. I called Sudco (for Mikuni parts in Colton Ca.) and they agreed. You can also get a very handy Mikuni "Pocket Tuner" from Sudco that determines main jet size for elevation and temperature changes once your dialed in.
 
The main jet size increased in 1979 because the new airbox flowed 3 times the airflow that the 1978 airbox could move. I found that out in a test on the 1979 390CR , It initially seized a few times on the old jetting and did not resolve until they changed to a 480 main jet.
 
Jimspac, very interesting information. I've got my 78 almost completely sorted out. At track elevations from 1500 feet to 3500 feet the bike was just blubbeing from a quarter throttle to WOT with a variety of jet sizes from 400 up to 430 and a variety of needle positions. I changed the needle jet from the stock Q8 down to a Q6, and everything came together.
 
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