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 The previous version was outdated and no longer supported.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

Cylinder base gasket leak

390wr Jon

390wr Jon

Husqvarna
AA Class
Put a new piston in my 1980 390WR and installed a new base gasket (from Hall’s) during cylinder reassembly. After properly torquing the cylinder head I now have a leak at the cylinder base gasket during a leak down test. Does anyone use a gasket sealant for this gasket? If so, any recommendations on the sealant to use?

Any insight would be appreciated.

Thanks,

Jon
 
Much discussion about installing dry or with some type of sealant. Some suggest a bit of grease, some will use a light coat of spray paint. Typical sealants used are Yamabond, Threebond, Permatex, etc (make sure it is the fuel resistant version). The important part is to use a very light coating - don't want bits of 'goop' in the crankcase. The drawback to using sealant is it makes removing the cylinder in the future a bit harder.

First though, it might be useful to figure out why there is a leak in the first place. I've seen a mismatch at the case junction causing a leak. Using something very straight, i.e. a machinist ruler or other, see if the case / cylinder mating surface is flat - both on the case and the cylinder. Using "Scotch-Brite" (Non-Scratch) or 600 wet/dry to ensure the mating surfaces are clean is helpful also.

Let us know how it progresses.
 
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