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 The previous version was outdated and no longer supported.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

Auto decompressor spring tension

B

Bahr

Husqvarna
A Class
My decompressor was jammed up slightly and not working, I lapped the hole in the cam and it's smooth now, but I noticed the spring is all loose, like there's no tension holding the decompressor flyweight in until it's about half way.

I assembled it again with one turn preload and tested it on the lathe to check the speed and now the weight flies out at 800rpm. Is that correct? Are you supposed to preload the spring one turn?
 

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I don't remember whether mine had any preload, but let's see:

• Why it may not need that one turn preload: the spring in your picture looks too warped to me and I guess it looked like mine without that one turn; take a look:
closed.jpg
open.jpg
With the decompressor mass in either the high revs or low revs position, my spring looks less warped than the one in your picture.

• Why it may need that preload: 800 rpm at the camshaft means 1,600 at the crankshaft, which is roughly the idling speed of the engine. If, without preload, your decompressor starts flying at a speed higher than half the idle speed of the engine, then surely it doesn't work properly and probably you can use that one turn preload.
 
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