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 The previous version was outdated and no longer supported.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

390 AMX

stormer254

stormer254

Husqvarna
AA Class
I have spare 390 auto engine which has lost it's engine number but I think it might be an AMX. I have looked in the 79 spare parts book and it does show some different springs which I guess is the only real difference in a MX engine. Is this correct and is there any way telling the springs apart so I can check and confirm? I want to build an MX version for next season.
Any advice or information would be gratefully received.
 
I have just aquired a 78 390 AMX engine Steve. If I can find time over the festive period I will have look inside mine to see what I have.
Mine has the engine prefix 2070. I need spag bearings. Mine are in a separate box, in a million pieces !
 
Will it fit in this? ;)
AMX-cutaway.jpg
 
When I was riding and buying parts for the 420 auto the lady at the parts counter told me the difference in the models was only the suspention. If you found some spring differences you are doing good. There is a little booklet perhaps even on here in the tech info section that kind of explains the springs. Hopefully I am mostly correct here, Depending on the size of the front sprocket for the drive chain and the springs you put in that big drum in the various sets of bobweights the revolutions per minute (load comes in as well) the various shifts occur. I never messed with mine but a serious rider would most likely have a little box of various springs with color in the form of paint on them. I hear it is possible to get it to engage hard enough to stand up and a top rider would be able to put a little pressure on the clutch in this situation if it was a standard shift bike.

There is a lot of stuff burried in the service bulletins on here I am glad I didn't know when I was riding this type of bike.

The crude way to measure the springs would be to clamp one end in a vice and put a scale similar to one holds up with a fish on it to get their picture taken and measure how much it stretches and how much force to do that.

Somehow I seem to recall something about the weight ot the bobweights, Whether only factory riders might have had access to different weight ones of it would require adding or removing metal. At any rate there is the possibility of adjusting that property as well.

Fran
 
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